Check a route path:
Start a container in --net=routed
mode:
sudo docker run --rm -it --net=routed --ip-address=10.241.9.10 centos
vethrb31af40 = container network interface obtained from ip route
output.
[jtaylor@ip-10-240-0-77 ~]$ ip route get 216.58.199.36 from 10.241.9.10 iif vethrb31af40
216.58.199.36 from 10.241.9.10 via 10.240.0.1 dev eth0
cache iif *