One-way traffic on with the EM7411

[Liam]

Hi,

libqmi has performed fantastically with the EM7455. Using the typical 'qmi-network start' and then a dhcp client to get an address works pretty seamlessly.

My problem is that I have been asked to eval the EM7411 and I cannot get DHCP to resolve and traffic is only coming from the interface, not to it. This is the general steps:


  1.  Start qmi-network successfully and confirm the network IP address with --wds-get-current-settings
  2.  Perform DHCP on the 'wwan0' interface and fail
  3.  Manually set the wwan0 interface IP to that returned by wds-get-current-settings
  4.  Can see pings comes through the interface, but do not see them or any other traffic coming from it

ON THE EM7411 DEVICE
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wwan0, link-type RAW (Raw IP), capture size 262144 bytes
09:23:18.783894 IP 10.222.3.169 > 10.222.9.147: ICMP echo request, id 27414, seq 36, length 64
09:23:18.784106 IP 10.222.9.147 > 10.222.3.169: ICMP echo reply, id 27414, seq 36, length 64
09:23:19.742704 IP 10.222.3.169 > 10.222.9.147: ICMP echo request, id 27414, seq 37, length 64
09:23:19.742915 IP 10.222.9.147 > 10.222.3.169: ICMP echo reply, id 27414, seq 37, length 64

TO THE EM7511 DEVICE
listening on wwan0, link-type RAW (Raw IP), capture size 262144 bytes
21:09:33.866587 IP 10.222.3.169 > 10.222.9.147: ICMP echo request, id 27414, seq 333, length 64
21:09:34.870089 IP 10.222.3.169 > 10.222.9.147: ICMP echo request, id 27414, seq 334, length 64

Anyone have a clue what could be causing this issue?

-Liam


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