IPv4 config for QMI modem

[Aleksander Morgado]

Hey,

> [   76.015857] ModemManager[841]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
> [   76.021750] NetworkManager[739]: <info>  [1541687323.8756] modem["cdc-wdm0"]: modem state changed, 'registered' --> 'connecting' (reason: user-requested)
> [   76.026784] ModemManager[841]: [/dev/cdc-wdm0] Allocating new client ID...
> [   76.034600] ModemManager[841]: [/dev/cdc-wdm0] Registered 'wds' (version 1.67) client with ID '2'
> [   77.123676] ModemManager[841]: QMI IPv4 Settings:
> [   77.125930] ModemManager[841]:     Address: a.b.c.d/29
> [   77.126327] ModemManager[841]:     Gateway: a.b.c.d
> [   77.126594] ModemManager[841]:     DNS #1: a.b.c.d
> [   77.126845] ModemManager[841]:     DNS #2: a.b.c.d
> [   77.127088] ModemManager[841]:        MTU: 68
> [   77.127338] ModemManager[841]: [/dev/cdc-wdm0] Allocating new client ID...
> [   77.134705] ModemManager[841]: [/dev/cdc-wdm0] Registered 'wds' (version 1.67) client with ID '3'
> [   77.163151] ModemManager[841]: error: couldn't start network: QMI protocol error (14): 'CallFailed'
> [   77.163733] ModemManager[841]: call end reason (1): 'generic-unspecified'
> [   77.164138] ModemManager[841]: verbose call end reason (2,210): [internal] pdn-ipv6-call-disallowed
> [   77.165411] ModemManager[841]: Modem /org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected)
> [   77.167966] ModemManager[841]: Simple connect state (8/8): All done
> [   77.170573] NetworkManager[739]: <info>  [1541687325.0254] modem["cdc-wdm0"]: modem state changed, 'connecting' --> 'connected' (reason: user-requested)
> [   77.191357] NetworkManager[739]: <info>  [1541687325.0462] device (cdc-wdm0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
> [   77.196246] NetworkManager[739]: <info>  [1541687325.0512] device (cdc-wdm0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
> [   77.200582] NetworkManager[739]: <info>  [1541687325.0555] dhcp4 (wwan0): activation: beginning transaction (no timeout)
> [   77.201303] NetworkManager[739]: <info>  [1541687325.0562] modem["cdc-wdm0"]: IPv6 configuration disabled
>

Could you try requesting for an IP4-only connection (flagging as
disabled the IPv6 settings explicitly)? Looks like the IPv4 setup
succeeds and the IPv6 setup fails. Not saying that is the only fix
needed, because I believe the modem should allow the IPv4 setup even
if the IPv6 fails, but who knows.

-- 
Aleksander
https://aleksander.es