ARP failure with EM7430

[Sakai, Kouji]

Hello, all

I am trying to manage a EM7430 using libqmi-1-18.0 and kernel-4.8.0-54-generic.

The connection is completed using qmi-network.

root at thinkpad:~# qmi-network /dev/cdc-wdm0 start
Loading profile at /etc/qmi-network.conf...
    APN: spmode.ne.jp
    APN user: aaa
    APN password: bbb
    qmi-proxy: yes
Checking data format with 'qmicli -d /dev/cdc-wdm0 --wda-get-data-format --device-open-proxy'...
[27  6月 2017, 13:45:25] -Warning ** [/dev/cdc-wdm0] requested auto mode but no MBIM QMUX support available
Device link layer protocol retrieved: raw-ip
Getting expected data format with 'qmicli -d /dev/cdc-wdm0 --get-expected-data-format'...
[27  6月 2017, 13:45:25] -Warning ** [/dev/cdc-wdm0] requested auto mode but no MBIM QMUX support available
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='spmode.ne.jp',username='aaa',password='bbb'  --client-no-release-cid --device-open-proxy'...
[27  6月 2017, 13:45:25] -Warning ** [/dev/cdc-wdm0] requested auto mode but no MBIM QMUX support available
Saving state at /tmp/qmi-network-state-cdc-wdm0... (CID: 35)
Saving state at /tmp/qmi-network-state-cdc-wdm0... (PDH: 63700256)
Network started successfully


But the result of ifconfig is empty. 
So, I manually try to config with ifconfig, but ping does not pass.

root at thinkpad:~# qmicli -d /dev/cdc-wdm0 --wds-get-current-settings
[27  6月 2017, 13:45:39] -Warning ** [/dev/cdc-wdm0] requested auto mode but no MBIM QMUX support available
[/dev/cdc-wdm0] Current settings retrieved:
           IP Family: IPv4
        IPv4 address: 10.80.106.48
    IPv4 subnet mask: 255.255.255.224
IPv4 gateway address: 10.80.106.49
    IPv4 primary DNS: 110.163.0.5
  IPv4 secondary DNS: 110.163.0.6
                 MTU: 1500
             Domains: none
root at thinkpad:~# ifconfig wwp0s20u3i8 10.80.106.48 netmask 255.255.255.224
root at thinkpad:~# route add default gw 10.80.106.49 wwp0s20u3i8

As a result, ping for EM 7430 came to pass, but ping for default gw still does not pass.

root at thinkpad:~# ping 10.80.106.49
PING 10.80.106.49 (10.80.106.49) 56(84) bytes of data.
>From 10.80.106.48 icmp_seq=1 Destination Host Unreachable
>From 10.80.106.48 icmp_seq=2 Destination Host Unreachable

If I check with tcpdump, I found that linux is trying to resolve the default gw address with ARP.
I think EM7430 only supports raw ip mode, ARP processing seems to be impossible.

Please tell me how to deal with it.

Best Regards,
Koji Sakai