Bug: data mobile interface looses ip

pparent

I've mentioned in Smooth Edges a bug that drives me mad concerning the fact that I regularly loose mobile data on my Vollaphone 22 on 24.04-1.1 ( with "free mobile"), and I have to switch to 2G then go back to LTE to have it working again.

I have investigated and now I know more. It seems to be an IP adress problem. When the bug appears I see "L" (for LTE) in the status bar but I have:

ccmni1: flags=193<UP,RUNNING,NOARP>  mtu 1280
        inet6 fe80::58e:ee25  prefixlen 64  scopeid 0x20<link>
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 123325  bytes 160619148 (160.6 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 47763  bytes 4939925 (4.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

And ip route is null.

After swtiching to 2G and then 4G I get

ccmni0: flags=193<UP,RUNNING,NOARP>  mtu 1500
        inet 10.15.62.187  netmask 255.0.0.0
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 834  bytes 79443 (79.4 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 22  bytes 5869 (5.8 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

phablet@ubuntu-phablet:~$ ip route
default via 10.15.62.187 dev ccmni0 proto static metric 700 
10.0.0.0/8 dev ccmni0 proto kernel scope link src 10.15.62.187 
10.15.62.187 dev ccmni0 proto static scope link metric 700

Next time I see the problem I will see if running a simple dhclient solves it (I think it will). If so I might write a simple script to detect when I loose the IP while the LTE network is connected, and trigger automatically a dhclient as a temporary fix for my own use. Even if including a fix to the system would be ideal.

domubpkm

@pparent Sometimes (not always) I don't have internet after stopping - starting or restarting my Volla 22 even if the icon shown is L. I also occasionally lose internet even with L in the indicators. The simplest solution is to turn off the cellular data and turn it back on and the internet comes back. Bouygues for me. This since i have Noble.

pparent

@domubpkm said in Bug: data mobile interface looses ip:

The simplest solution is to turn off the cellular data and turn it back

Yes I know but this is a workaround not a real solution, it's not convenient at all, especially if you expect to receive notifications Internet needs to run always in background without manual action. Especially in the context of VoLTE I wonder what impact it has on incoming calls.

domubpkm

@pparent said in Bug: data mobile interface looses ip:

this is a workaround not a real solution

totally agree

I don't know if this currently has an impact on telephone communications since I can call and receive calls with disconnected cellular data. And for 4G calls, Volte is not working for me currently.

pparent

By the way I've just noticed something else strange in the logs:
sometimes I have 2 interfaces called "ccmni1" and "ccmni2". But sometimes I have "ccmni0" and "ccmni2" . I'm not sure if it is related to this bug or not, as both possibilities seem to be able to work if the interface has proper IP.

pparent

Actually I have had the bug once again, and this time the interface holding the IP "ccmni0" was down, but forcing it up did not restore the connexion, I could ping the gateway but nothing more.