<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><font face=""courier new", courier, monaco, monospace, sans-serif">Silly routing question.... :)<br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">I just got a Sierra Wireless MC7455 today, and plugged it into my linux machine running ArchLinux (4.12.4). I installed qmicli (1.18.0) and was able to connect to Verizon.</font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">First, this is how Arch is naming the interfaces for "/dev/cdc-wdm1" and "/dev/cdc-wdm2":<br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">6: wwp25s0u2u7i8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 1000<br> link/ether 1a:22:c6:af:bf:43 brd ff:ff:ff:ff:ff:ff<br>7: wwp25s0u2u7i10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 1000<br> link/ether 0e:99:f4:4c:78:f8 brd ff:ff:ff:ff:ff:ff<br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">Second, my connection details:</font></div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font><div><font face=""courier new", courier, monaco, monospace, sans-serif"># qmicli -d /dev/cdc-wdm1 --wds-get-current-settings<br></font></div><font face=""courier new", courier, monaco, monospace, sans-serif"><br>[/dev/cdc-wdm1] Current settings retrieved:<br> IP Family: IPv4<br> IPv4 address: 100.115.2.193<br> IPv4 subnet mask: 255.255.255.252<br>IPv4 gateway address: 100.115.2.194<br> IPv4 primary DNS: 198.224.172.135<br> IPv4 secondary DNS: 198.224.175.135<br> MTU: 1428<br></font><div><font face=""courier new", courier, monaco, monospace, sans-serif"> Domains: none</font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">Third, both interfaces are in "raw-ip" mode (this is how the MC7455 came):</font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"># qmicli -d /dev/cdc-wdm1 --wda-get-data-format<br>[/dev/cdc-wdm1] Successfully got data format<br> QoS flow header: no<br> Link layer protocol: 'raw-ip'<br> Uplink data aggregation protocol: 'disabled'<br>Downlink data aggregation protocol: 'disabled'<br> NDP signature: '0'<br> Uplink data aggregation max size: '0'<br></font><div><font face=""courier new", courier, monaco, monospace, sans-serif">Downlink data aggregation max size: '0'</font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><font face=""courier new", courier, monaco, monospace, sans-serif"># qmicli -d /dev/cdc-wdm2 --wda-get-data-format<br>[/dev/cdc-wdm2] Successfully got data format<br> QoS flow header: no<br> Link layer protocol: 'raw-ip'<br> Uplink data aggregation protocol: 'disabled'<br>Downlink data aggregation protocol: 'disabled'<br> NDP signature: '0'<br> Uplink data aggregation max size: '0'<br>Downlink data aggregation max size: '0'<br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">Since the modem is in 'raw-ip' mode, I understand that dhclient / dhcpd won't work, so I need to manually configure networking. I tried the following, which was accepted:<br></font></div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font><div><div><font face=""courier new", courier, monaco, monospace, sans-serif"># ip addr add 100.115.2.193 dev wwp25s0u2u7i8</font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"># ip route add default dev wwp25s0u2u7i8</font></div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">If I try to "ping 8.8.8.8" with the above,then my machine is trying to ARP over the raw-ip interface:<br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"> 1 0.000000000 1a:22:c6:af:bf:43 → Broadcast ARP 42 Who has 8.8.8.8? Tell 100.115.2.193<br> 2 1.021524595 1a:22:c6:af:bf:43 → Broadcast ARP 42 Who has 8.8.8.8? Tell 100.115.2.193<br> 3 2.034858653 1a:22:c6:af:bf:43 → Broadcast ARP 42 Who has 8.8.8.8? Tell 100.115.2.193<br></font><div><font face=""courier new", courier, monaco, monospace, sans-serif"> 4 3.048575140 1a:22:c6:af:bf:43 → Broadcast ARP 42 Who has 8.8.8.8? Tell 100.115.2.193</font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">What is the correct way to configure networking? And should I change the MTU of 1500 on <font face=""courier new", courier, monaco, monospace, sans-serif">wwp25s0u2u7i8</font> to 1428 so that it matches what qmicli is reporting, or does it not matter?<br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif"><br></font></div><div><font face=""courier new", courier, monaco, monospace, sans-serif">Thanks so much!</font><br></div><div><br></div></div></div></body></html>