No IP Assigned to Interface with QMI on Quectel EC-25A
Username: John Marrett
Origin: https://bugs.openwrt.org/index.php?do=details&task_id=1252
I’m attempting to use QMI on a GL.Inet MiFi equipped with a Quectel EC-25A cellular modem.
When I configure the interface using qmi I am able to connect to the cellular network at the radio layer, however my wwan0 interface is not assigned an IP address. Here’s my configuration from /etc/config/network:
config interface 'modem' option proto 'qmi' option ifname 'wwan0' option device '/dev/cdc-wdm0' option country 'country11' option apn 'inet.bell.ca'
And some commands showing the device behaviour. You’ll note that raw_ip needs to be set to Y. I’ve integrated this [patch](
https://github.com/bmork/LEDE/commit/10aed12fa587e818e4dc5d0db54545623fbe9b5f
) to have qmi.sh set the raw_ip mode when required.
root@OpenWrt:# cat /sys/class/net/wwan0/qmi/raw_ip
Y
root@OpenWrt:# ifup modem
root@OpenWrt:# uqmi -d /dev/cdc-wdm0 --get-data-status
"connected"
root@OpenWrt:# uqmi -d /dev/cdc-wdm0 --get-current-settings
{
"pdp-type": "ipv4",
"ip-family": "ipv4",
"mtu": 1500,
"ipv4": {
"ip": "100.105.180.51",
"dns1": "206.47.201.246",
"dns2": "207.231.231.254",
"gateway": "100.105.180.52",
"subnet": "255.255.255.248"
},
"ipv6": {
},
"domain-names": {
}}
root@OpenWrt:~# ifconfig wwan0
wwan0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet6 addr: fe80::d789:480e:bfc8:2dac/64 Scope:Link
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:28 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5129 (5.0 KiB) TX bytes:768 (768.0 B)
If I manually use the uqmi command to connect to the cellular network I can then drive the wwan0 interface using dhcp successfully. Here’s my /etc/config/network.
config interface 'modem' option proto 'dhcp' option ifname 'wwan0'
And the resulting successful network connection:
root@OpenWrt:# ifup modem
root@OpenWrt:# ifconfig wwan0
wwan0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
inet addr:100.105.180.51 P-t-P:100.105.180.51 Mask:255.255.255.248
inet6 addr: fe80::d789:480e:bfc8:2dac/64 Scope:Link
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:80 errors:0 dropped:0 overruns:0 frame:0
TX packets:68 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:24102 (23.5 KiB) TX bytes:16842 (16.4 KiB)
root@OpenWrt:~# ping -c 1 google.ca PING google.ca (172.217.1.163): 56 data bytes 64 bytes from 172.217.1.163: seq=0 ttl=51 time=29.792 ms
– google.ca ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 29.792/29.792/29.792 ms
I believe that for some reason the dhcp client isn’t being run on the wwan0 interface by qmi.sh once it’s online but I’m not able to determine how this is supposed to work. I’m eager to address this issue and submit the resulting patches. Please let me know if you can help.
root@OpenWrt:~# ping -c 1 8.8.8.8 PING 8.8.8.8 (8.8.8.8): 56 data bytes 64 bytes from 8.8.8.8: seq=0 ttl=54 time=31.805 ms
– 8.8.8.8 ping statistics —
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 31.805/31.805/31.805 ms