internal neworking works

example:

root@allinone:/home/vagrant# ip netns exec qrouter-a7f29680-2e15-4566-b97b-2d5d0ea2cc20 ping 172.16.255.3
PING 172.16.255.3 (172.16.255.3) 56(84) bytes of data.
64 bytes from 172.16.255.3: icmp_req=1 ttl=64 time=3.43 ms
64 bytes from 172.16.255.3: icmp_req=2 ttl=64 time=0.462 ms
^C
--- 172.16.255.3 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1000ms
rtt min/avg/max/mdev = 0.462/1.949/3.436/1.487 ms
root@allinone:/home/vagrant# ip netns exec qrouter-a7f29680-2e15-4566-b97b-2d5d0ea2cc20 ssh 172.16.255.3
The authenticity of host '172.16.255.3 (172.16.255.3)' can't be established.
RSA key fingerprint is de:82:23:24:aa:07:82:7e:6b:43:9f:52:5e:4a:31:80.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '172.16.255.3' (RSA) to the list of known hosts.