IPFire VPN IPSec Net-to-Net FRITZ-Box-6890-LTE

Hi everybody,

I am trying to create a IPSec VPN from my IPFire to a FritzBox 6890 LTE. But it do not work. Both systems are on the latest stable patch level.

I followed this wiki documentation, but it do not work: https://wiki.ipfire.org/configuration/services/ipsec/avm-fritzbox

Also this discussion do not work for me: https://forum.ipfire.org/viewtopic.php?t=16254

The IPFire is installed at Cloud Server with a fixed IP - the FritzBox have a dynamic DNS Name from the AVM service.

Does anyone have some hints for me?