[FS#3306] QMI & DHCP renewal issue.

[OpenWrt Bugs]

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User who did this - MiNuS (bgiboudeau) 

Attached to Project - OpenWrt/LEDE Project
Summary - QMI & DHCP renewal issue.
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - I'm facing a problem on two routers WG3526 (Modem EC-25) and D-Link DWR921 (Model Broadmobi BM806). My 4G provider is Free Mobile a French mobile provider.

Every 12 hours my ISP change the IP of the interface and the DHCP-Client still get the old IP Address even if "uqmi -d /dev/cdc-wdm0 –get-current-settings" display the new valid ip address.
  * "uqmi -d /dev/cdc-wdm0 –get-current-settings" give IP "B".
  * "udhcpc" still attribute IP "A" to the wwan0 interface resulting in an nonoperational interface until I restart it (ubus call network.interface.wwan down / ubus call network.interface.wwan up).
  * After an interface restart "udhcpc" attribute IP "B" to the wwan0 interface.
This problem happen exactly every 12 hours the duration of the dhcp lease time on the interface wwan0.


I don't know if it's a bug in the firmware of both modems or a problem within OpenWRT.
I can provide more informations or context if needed. It's also described on another bug in the comment section by @Dmitry. As it's another bug not related to the original one a new bug is needed. Thread reference [[https://bugs.openwrt.org/index.php?do=details&task_id=1252]].


----

====Detailed description of the BUG====

===='uqmi -d /dev/cdc-wdm0 –get-current-settings' display the new IP address====

uqmi -d /dev/cdc-wdm0 –get-current-settings {

      "pdp-type": "ipv4",
      "ip-family": "ipv4",
      "mtu": 1500,
      "ipv4": {
              "ip": "10.81.148.43",
              "dns1": "193.41.60.16",
              "dns2": "193.41.60.15",
              "gateway": "10.81.148.44",
              "subnet": "255.255.255.248"
      },
      "ipv6": {
      },
      "domain-names": {
      }
}


==== 'ifconfig wwan0' is showing a different IP. I tryed to restart udhcpc manually but the interface still get the old IP until I restart network interface ====

ifconfig wwan0

        inet addr:10.95.107.241  P-t-P:10.95.107.241  Mask:255.255.255.252
        inet6 addr: fe80::e1b3:e56d:de16:ba57/64 Scope:Link
        UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
        RX packets:54582 errors:0 dropped:0 overruns:0 frame:0
        TX packets:64104 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:1000
        RX bytes:46222544 (44.0 MiB)  TX bytes:60349584 (57.5 MiB)


====After a network stack restart, "ifconfig wwan0" display the proper IP address.====

ifconfig wwan0
        inet addr:10.81.148.43  P-t-P:10.81.148.43  Mask:255.255.255.248
        inet6 addr: fe80::e1b3:e56d:de16:ba57/64 Scope:Link
        UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
        RX packets:54584 errors:0 dropped:0 overruns:0 frame:0
        TX packets:64112 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:1000
        RX bytes:46223174 (44.0 MiB)  TX bytes:60351028 (57.5 MiB)


====Problem happen again after 12 hours.====





----

====Details on the WG3526====

root at nly-marconi:/etc/config# ubus call system board
{
	"kernel": "4.14.180",
	"hostname": "nly-marconi",
	"system": "MediaTek MT7621 ver:1 eco:3",
	"model": "ZBT-WG3526 (16M)",
	"board_name": "zbt-wg3526-16M",
	"release": {
		"distribution": "OpenWrt",
		"version": "19.07.3",
		"revision": "r11063-85e04e9f46",
		"target": "ramips/mt7621",
		"description": "OpenWrt 19.07.3 r11063-85e04e9f46"
	}
}



root at nly-marconi:~# uci show network.wwan
network.wwan=interface
network.wwan.proto='qmi'
network.wwan.device='/dev/cdc-wdm0'
network.wwan.apn='free'
network.wwan.auth='none'
network.wwan.pincode='my-pin-code-here'
network.wwan.modes='lte'
network.wwan.metric='20'
network.wwan.delegate='0'
network.wwan.force_link='0'



----

====Details ont the Dlink router====

root at lfgo-routeur:~# ubus call system board
{
	"kernel": "4.14.180",
	"hostname": "lfgo-routeur",
	"system": "MediaTek MT7620N ver:2 eco:6",
	"model": "D-Link DWR-921 C1",
	"board_name": "dlink,dwr-921-c1",
	"release": {
		"distribution": "OpenWrt",
		"version": "19.07.3",
		"revision": "r11063-85e04e9f46",
		"target": "ramips/mt7620",
		"description": "OpenWrt 19.07.3 r11063-85e04e9f46"
	}
}


root at lfgo-routeur:~# uci show network.wwan
network.wwan=interface
network.wwan.ifname='wwan0'
network.wwan.device='/dev/cdc-wdm0'
network.wwan.proto='qmi'
network.wwan.apn='free'
network.wwan.pincode='my-pin-code-here'
network.wwan.delay='10'




More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3306

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