No IP address for a successful connection on LTE modem

Garfield Watkins garfield.watkins at
Tue Mar 5 10:56:44 UTC 2024

Spot on!
This was exactly the problem!

Thank you.

On 3/3/24 10:07, Aleksander Morgado wrote:
> On Wed, Feb 14, 2024 at 11:21 AM Garfield Watkins
> <garfield.watkins at>  wrote:
>> I think what confused me is that without the ModemManager i.e. using just cgact=1,1 to manually connect, i suddenly got an ip address assigned to the network interface provided by the modem. I thought it was NetworkManager running its dhcp client on that interface after getting a dhcp discover ? from the modem ? (i'm not too sure about how dhcp goes about its business)
>> Anyway i have now tried to use Network Manager to setup and connect but now am getting the following message:
>> modem-broadband[ttyUSB0]: failed to connect 'meig': Connection requested both IPv4 and IPv6 but dual-stack addressing is unsupported by the modem.
>> and disabling ipv6 I get:
>>   failed to connect 'meig': Connection requested IPv4 but IPv4 is unsupported by the modem.
>> Any idea where to start debugging that ?
> The "SupportedIpFamilies" property in the Modem interface is probably
> being reported empty?
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