[strongSwan] ipsec connection to aws vpc is up, ping works, but udp and tcp packets seem to get lost.

[Dominik Reusser]

I put a question with details on the problem on serverfault. The ipsec
tunnel is up. Ping is working. UDP packets are encrypted and are sent
out in the direction of the ipsec-responder according to tcpdump. So all
seems to be working. However, according to the monitoring at aws vpc,
nothing arrives. I would be thankful for hints on how to further narrow
down the problem:

https://serverfault.com/questions/1029253/udp-packets-seem-to-get-lost-in-ipsec-tunnel-to-aws-cloud

Greetings

Dominik