Strange behaviour of Sierra Wireless MC7430

[Erik Kazandjian]

Hi

Using the busybox dhcp client it seems to work

BR

Erik


On 10/17/2017 07:52 AM, Erik Kazandjian wrote:
>
> Hi,
>
> The MC7430 does behave very strange when I try to setup ip 
> connectivity to it.
>
> When I bring the modem on line *qmicli -d /dev/cdc-wdm0 
> --dms-set-operating-mode=online* I see the modem attaching on our cell 
> and in the Attach accept message it gets an IP address. That address 
> is not automatically added to the wwan0 interface. Verification of the 
> nas-serving-system returns the following info
>
> *qmicli -d /dev/cdc-wdm0  --nas-get-serving-system *
> [/dev/cdc-wdm0] Successfully got serving system:
>     Registration state: 'registered'
>     CS: 'attached'
>     PS: 'attached'
>     Selected network: '3gpp'
>     Radio interfaces: '1'
>         [0]: 'lte'
>     Roaming status: 'off'
>     Data service capabilities: '1'
>         [0]: 'lte'
>     Current PLMN:
>         MCC: '1'
>         MNC: '1'
>         Description: 'Test1-1'
>     Roaming indicators: '1'
>         [0]: 'off' (lte)
>     3GPP location area code: '65534'
>     3GPP cell ID: '769'
>     Detailed status:
>         Status: 'available'
>         Capability: 'cs-ps'
>         HDR Status: 'none'
>         HDR Hybrid: 'no'
>         Forbidden: 'no'
>     LTE tracking area code: '1'
>     Full operator code info:
>         MCC: '1'
>         MNC: '1'
>         MNC with PCS digit: 'no'
>
>
> However when I try to get information about the IP address using 
> *qmicli -d /dev/cdc-wdm0  --wds-get-current-settings* I get
>
> error: couldn't get current settings: QMI protocol error (15): 'OutOfCall'
>
> Until a few days ago this would just return me the assigned IP 
> address. If I than start the network (can someone explain me what this 
> does) I get the following *qmi-network /dev/cdc-wdm0 start*
>
>
> Loading profile at /etc/qmi-network.conf...
>     APN: internet
>     APN user: unset
>     APN password: unset
>     qmi-proxy: no
> Checking data format with 'qmicli -d /dev/cdc-wdm0 
> --wda-get-data-format '...
> Device link layer protocol retrieved: raw-ip
> Getting expected data format with 'qmicli -d /dev/cdc-wdm0 
> --get-expected-data-format'...
> Expected link layer protocol retrieved: raw-ip
> Device and kernel link layer protocol match: raw-ip
> Starting network with 'qmicli -d /dev/cdc-wdm0 
> --wds-start-network=apn='internet'  --client-no-release-cid '...
> Saving state at /tmp/qmi-network-state-cdc-wdm0... (CID: 35)
> Saving state at /tmp/qmi-network-state-cdc-wdm0... (PDH: 62876480)
> Network started successfully
>
> If I than ask for the current settings *qmicli -d /dev/cdc-wdm0  
> --wds-get-current-settings* I get
>
>  Current settings retrieved:
>            IP Family: IPv4
>         IPv4 address: 10.188.20.18
>     IPv4 subnet mask: 255.255.255.252
> IPv4 gateway address: 10.188.20.17
>     IPv4 primary DNS: 8.8.8.8
>                  MTU: 1500
>              Domains: none
>
>
> The first thing I noticed is the netmask. I don't know where the modem 
> is getting this from but it is definitely not coming from the core 
> network. Anyway if I assign 10.188.20.18/24 to the wwan0 interface I 
> see that wwan0 is configured but the Link encap is UNSPEC
>
> wwan0     Link encap:UNSPEC  HWaddr 
> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>           inet addr:10.188.20.18  P-t-P:10.188.20.18 Mask:255.255.255.0
>           inet6 addr: fe80::d37a:aed3:aeb:4d4/64 Scope:Link
>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500 Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:0 (0.0 B)  TX bytes:504 (504.0 B)
>
> If I than try to ping from my raspberry pi which has the modem 
> connected to a host behind the core network, I see nothing arriving in 
> the GTP tunnel on core network, however when I ping from the host 
> behind the core network to 10.188.20.18 I get replies from the ping , 
> I even see them in both directions going through the GTP tunnel but on 
> my linux interface (wwan0) on the rasberry pi I don't see any packet 
> being received or transmitted. So it looks as if the Sierra Wireless 
> card is responding to the pings but it is not offering its IP 
> capabilities to the my Linux.
>
> Does any body has any idea what is going on ?
>
> Kind regards
>
> Erik
>
>

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