[strongSwan] route traffic to docker0 bridge

[Christoph Gysin]

Docker creates a bridge docker0 and routes traffic through it:

$ brctl show
bridge name     bridge id               STP enabled     interfaces
docker0         8000.0242e39e4cfd       no              vethc5308b1

$ ip route
[...]
172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown

After starting an ipsec connection, this stops working.

I'm trying to understand how traffic is routed, and read:
https://wiki.strongswan.org/projects/strongswan/wiki/IntroductionTostrongSwan#Routing

I can see it created the routing table 220:

$ ip route show table 220
default via 10.181.24.1 dev wlp2s0 proto static src 10.191.2.52

I also found some pointers in https://wiki.strongswan.org/issues/1247,
but I'm still not sure what is the right way to fix this.

How can I configure my system to allow traffic to 172.17.0.0/16 be
routed to docker0 even when the ipsec connection is up?

Thanks,
Chris
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