<div dir="ltr"><div dir="ltr"> </div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Mar 4, 2022 at 9:43 AM Aleksander Morgado <<a href="mailto:aleksander@aleksander.es">aleksander@aleksander.es</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hey, > I need some help in establishing simultaneous interfaces to multiple APNs. > > I have an Ubuntu 20.04 system with a single cellular modem attached via USB in an IoT application. My problem is that I need to drive traffic through two different APNs when registered to the same cellular network. Each APN serves a different purpose -- different services with different billing are to occur on each. > > I've tried multiple ways to do this. While I can get connected with two APNs, I can only get an interface name for one of the connections. I need a separate interface name for each so that I can place the respective flow of traffic through the appropriate interface and onto the correct APN. My application needs both to be available simultaneously. Going back and forth between building up and tearing down each of them is not an acceptable solution. > > I tried three different things and none have brought happiness: > > (1) Using mmcli in debug mode with a set of AT commands for each APN: using the sequence AT+GDCONT, AT+XGAUTH, and AT+CGACT with parameters relevant for the first APN and then again with the sequence AT+GDCONT, AT+XGAUTH, and AT+CGACT for the second APN. This is successful, and I obtain assigned IP addresses for each APN. However, neither of the APNs are assigned to an interface and I don't know how to funnel traffic to each. > > (2) I have used the bearer features of mmcli. I have run "mmcli -m <modem-number> --create-bearer=<key-value pairs>" two times, each with the proper key-value pairs for the respective APNs. When I later run "mmcli -m <modem_number>", I see both bearers. I then run "mmcli -m <modem-number> --bearer <bearer-number> --connect". This works the first time for the first APN/bearer, and I have an interface assigned. But I get the following error when next running " mmcli -m <modem-number> --bearer <bearer-number> --connect" for the second APN/bearer: > error: couldn't connect the bearer: 'GDBusError: org.freedesktop.ModemManager1.Error.Core.NotFound: No valid data port to launch connection' > > (3) I've put multiple connection keyfiles in the /etc/NetworkManager/system-connections directory. I run "nmcli con reload" and then "nmcli --wait 120 con up id <name_of_first_connection>". This works as I get connected to the first APN, get assigned an IP address, and get an interface association (wwan0). However, when I run "nmcli --wait 120 con up id <name_of_second_connection>", this works, but it displaces the first connection, so I am only left with the second connection on interface wwan0. The first connection is no longer available. > > My Ubuntu 20.04 system has mmcli 1.16.6 and nmcli 1.22.10. I could also install mbimcli 1.24.8, although it is not currently part of the system image. > > Ideas on how to accomplish what I am after? Your modem needs to be QMI or MBIM based, and you need to install ModemManager 1.18, which is the first version supporting multiplexing. Once you have that, you can: * run Modem.SimpleConnect() with"multiplex=required" Or: * start the ModemManager daemon with the additional --test-multiplex-requested option. My suggestion is to use the 2nd option, just start MM with --test-multiplex-requested so that any attempt to start a connection (e.g. via NetworkManager) will trigger the multiplex setup. When running with multiplex enabled, ModemManager will create a new virtual network interface for each APN connection, and then you can handle custom routing rules in the host for each of them. I talked a bit about this feature in the FOSDEM2022 talk earlier this year, if you're interested: <a href="https://fosdem.org/2022/schedule/event/mobile_modemmanager/" rel="noreferrer" target="_blank">https://fosdem.org/2022/schedule/event/mobile_modemmanager/</a> -- Aleksander <a href="https://aleksander.es" rel="noreferrer" target="_blank">https://aleksander.es</a></blockquote><div> </div><div>I attempted to use mmcli 1.18.6 and nmcli 1.36.0 with the create and connect bearer features of mmcli to create multiple simultaneous connections to two different APNs with a USB cellular modem on an Ubuntu Jammy Jellyfish 22.04 system. The ModemManager.service file had the debug and test-multiplex-requested options activated on the ExecStart line. Short summary of results: A sequence of mmcli commands to create a bearer, connect the bearer, create a second bearer, then connect the second bearer did result in multiple simultaneous packet data network connections. Some subsequent configuration with ip and route commands were necessary to make it work, but the second connection failed after a few minutes with error org.freedesktop.ModemManager1.Error.MobileEquipment.Unknown. More details starting from the beginning: After booting and logging in, I plugged in the modem into the system, it reported this configuration: <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ifconfig</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::ad94:11a5:b4a6:eada prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 00:0c:29:df:a4:a1 txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 0 bytes 0 (0.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 321 bytes 51137 (51.1 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> device interrupt 19 base 0x2000 </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet 127.0.0.1 netmask 255.0.0.0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 ::1 prefixlen 128 scopeid 0x10<host></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> loop txqueuelen 1000 (Local Loopback)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 8850 bytes 637347 (637.3 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 8850 bytes 637347 (637.3 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ip link list</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 00:0c:29:df:a4:a1 brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> altname enp2s1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">3: wwan0: <BROADCAST,MULTICAST,NOARP> mtu 1428 qdisc noop state DOWN mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 6a:d4:98:05:df:3a brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 6a:d4:98:05:df:3a brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ route</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Kernel IP routing table</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Destination Gateway Genmask Flags Metric Ref Use Iface</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><empty></pre> Running the command “sudo mmcli -L” indicated that my modem was number 0. I ran the following command: sudo mmcli -m 0 –create-bearer=’apn=apnname1,ip-type=ipv4,allowed-auth=pap,user=apnuser1,password=apnpass1’ This was successful and created bearer number 0. I then ran sudo mmcli -m 0 -b 0 --connect This was also successful. After doing this, the system’s networking configuration looked as follows: <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ifconfig</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><ens33 and lo omitted for brevity’s sake; they are identical to first listing></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">mbimmux0.1: flags=4291<UP,BROADCAST,RUNNING,NOARP,MULTICAST> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:3911:3b6a:6a96:92a4 prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 1 bytes 88 (88.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 24 bytes 4191 (4.1 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">wwan0: flags=67<UP,BROADCAST,RUNNING> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 1 bytes 88 (88.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 30 bytes 4271 (4.2 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ip link list</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><1: lo and 2: ens33 omitted for brevity’s sake; they are identical to first listing></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">3: wwan0: <BROADCAST,UP,LOWER_UP> mtu 1428 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">4: mbimmux0.1@wwan0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1428 qdisc noqueue state UP mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ route </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Kernel IP routing table</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Destination Gateway Genmask Flags Metric Ref Use Iface</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><empty></pre> I then ran sudo mmcli -m 0 –create-bearer=’apn=apnname2,ip-type=ipv4,allowed-auth=pap,user=apnuser2,password=apnpass2’ This was successful and created bearer number 1. I then ran sudo mmcli -m 0 -b 1 --connect This was also successful. After doing this, the system’s networking configuration looked as follows: <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ifconfig</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><ens33 and lo omitted for brevity’s sake; they are identical to first listing></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">mbimmux0.1: flags=4291<UP,BROADCAST,RUNNING,NOARP,MULTICAST> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:3911:3b6a:6a96:92a4 prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 1 bytes 88 (88.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 27 bytes 4512 (4.5 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">wwan0: flags=67<UP,BROADCAST,RUNNING> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 1 bytes 88 (88.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 36 bytes 4718 (4.7 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ip link list</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><1: lo and 2: ens33 omitted for brevity’s sake; they are identical to first listing></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">3: wwan0: <BROADCAST,UP,LOWER_UP> mtu 1428 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">4: mbimmux0.1@wwan0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1428 qdisc noqueue state UP mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">5: mbimmux0.2@wwan0: <BROADCAST> mtu 1428 qdisc noop state DOWN mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ route</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Kernel IP routing table</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Destination Gateway Genmask Flags Metric Ref Use Iface</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><empty></pre> I noticed that mbimmux0.2 did not appear in the “ifconfig” output and that “ip link list” did not report it as up. So I ran “sudo ip link set mbimmux0.2 up” and then the interface configuration looked like this: <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ifconfig</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><ens33 and lo omitted for brevity’s sake; they are identical to first listing></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">mbimmux0.1: flags=4291<UP,BROADCAST,RUNNING,NOARP,MULTICAST> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:3911:3b6a:6a96:92a4 prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 1 bytes 88 (88.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 29 bytes 4726 (4.7 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">mbimmux0.2: flags=67<UP,BROADCAST,RUNNING> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:19fd:361e:7fdb:ea15 prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 1 bytes 88 (88.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 10 bytes 868 (868.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">wwan0: flags=67<UP,BROADCAST,RUNNING> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 2 bytes 176 (176.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 49 bytes 5688 (5.6 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ip link list</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><1: lo and 2: ens33 omitted for brevity’s sake; they are identical to first listing></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">3: wwan0: <BROADCAST,UP,LOWER_UP> mtu 1428 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">4: mbimmux0.1@wwan0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1428 qdisc noqueue state UP mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">5: mbimmux0.2@wwan0: <BROADCAST,UP,LOWER_UP> mtu 1428 qdisc noqueue state UP mode DEFAULT group default qlen 1000</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> link/ether 9a:b0:d0:6e:dc:9f brd ff:ff:ff:ff:ff:ff</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ route</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Kernel IP routing table</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">Destination Gateway Genmask Flags Metric Ref Use Iface</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><empty></pre> The status of the modem and the two bearers was then as follows: <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ mmcli -m 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> General | path: /org/freedesktop/ModemManager1/Modem/0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | device id: a883afd9cd8161007d0e42fe1e7a52bd9073f70d</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Hardware | manufacturer: Undisclosed, Inc.</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | model: A101</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | firmware revision: A101_01.2000.00</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | h/w revision: A101_V4.5_MBIM_V4.5</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | supported: gsm-umts, lte</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | current: gsm-umts, lte</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | equipment id: 101000000000008</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> System | device: /sys/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | drivers: cdc_acm, cdc_mbim</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | plugin: generic</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | primary port: cdc-wdm0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | ports: cdc-wdm0 (mbim), ttyACM0 (at), ttyACM2 (at), wwan0 (net)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Status | unlock retries: sim-pin2 (3)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | state: connected</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | power state: on</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | access tech: gprs</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | signal quality: 80% (cached)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Modes | supported: allowed: 2g, 3g, 4g; preferred: none</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | current: allowed: 2g, 3g, 4g; preferred: none</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> IP | supported: ipv4, ipv6, ipv4v6</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> 3GPP | imei: 101000000000008</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | enabled locks: fixed-dialing</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | operator id: MCCMNC</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | operator name: MCCMNC</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | registration: roaming</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> 3GPP EPS | ue mode of operation: csps-2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Bearer | paths: /org/freedesktop/ModemManager1/Bearer/1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | /org/freedesktop/ModemManager1/Bearer/0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ mmcli -m 0 -b 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> General | path: /org/freedesktop/ModemManager1/Bearer/0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | type: default</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Status | connected: yes</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | suspended: no</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | multiplexed: yes</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | interface: mbimmux0.1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | ip timeout: 20</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Properties | apn: apnname1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | roaming: allowed</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | ip type: ipv4</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | allowed-auth: pap</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | user: apnuser1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | password: apnpass1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> IPv4 configuration | method: static</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | address: 10.3.1.2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | prefix: 24</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | gateway: 10.3.1.1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | dns: 208.67.222.222, 208.67.220.220</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Statistics | duration: 390</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | attempts: 1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | total-duration: 390</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ mmcli -m 0 -b 1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> General | path: /org/freedesktop/ModemManager1/Bearer/1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | type: default</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Status | connected: yes</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | suspended: no</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | multiplexed: yes</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | interface: mbimmux0.2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | ip timeout: 20</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Properties | apn: apnname2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | roaming: allowed</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | ip type: ipv4</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | allowed-auth: pap</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | user: apnuser2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | password: apnpass2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> IPv4 configuration | method: static</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | address: 10.3.1.3</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | prefix: 24</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | gateway: 10.3.1.1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | dns: 208.67.222.222, 208.67.220.220</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Statistics | attempts: 2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | total-duration: 284</pre> I noticed that I would need to add some route information in order to be able to direct traffic through the mmbimux0.1 and mbimmux0.2 interfaces. This is fine. However, after approximately five minutes of using and examining these interfaces, I noticed the second bearer connection had failed with an unknown error and mbimmux0.2 had been removed from the list of interfaces: <pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ mmcli -m 0 -b 1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> General | path: /org/freedesktop/ModemManager1/Bearer/1</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | type: default</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Status | connected: no</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | connection error name: org.freedesktop.ModemManager1.Error.MobileEquipment.Unknown</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | connection error message: Unknown error</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | suspended: no</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | multiplexed: no</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | ip timeout: 20</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Properties | apn: apnname2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | roaming: allowed</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | ip type: ipv4</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | allowed-auth: pap</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | user: apnuser2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | password: apnpass2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> --------------------------------------</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> Statistics | duration: 294</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | attempts: 2</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> | total-duration: 578</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">user@ubuntu22a:~/Documents$ ifconfig</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""><ens33 and lo omitted for brevity’s sake; they are identical to first listing></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">mbimmux0.1: flags=4291<UP,BROADCAST,RUNNING,NOARP,MULTICAST> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 2001:db53:18ae:0:3911:3b6a:6a96:92a4 prefixlen 64 scopeid 0x0<global></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 1 bytes 88 (88.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 30 bytes 4833 (4.8 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> </pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New"">wwan0: flags=67<UP,BROADCAST,RUNNING> mtu 1428</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> inet6 fe80::98b0:d0ff:fe6e:dc9f prefixlen 64 scopeid 0x20<link></pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> ether 9a:b0:d0:6e:dc:9f txqueuelen 1000 (Ethernet)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX packets 3 bytes 264 (264.0 B)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> RX errors 0 dropped 0 overruns 0 frame 0</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX packets 62 bytes 6621 (6.6 KB)</pre><pre style="margin:0in 0in 0.0001pt;font-size:10pt;font-family:"Courier New""> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0</pre> After it fails, running “sudo mmcli -m 0 -b 1 --connect” then “sudo ip link set mbimmux0.2 up” puts things back in business. I did not expect to have to keep checking and then stand it back up when it fails. Questions: 1. How can I keep the second bearer connection from falling over? 2. Is it expected that “sudo ip link set mbimmux0.2 up” would be necessary after the second bearer connection is established? Is this the right thing to do? 3. Is there a way to have the ifconfig and route entries managed by any of this software to avoid the need to “manually” manage them? 4. Any other advice to help me achieve happiness? </div><div> </div></div></div>