A server got 4 NICs, and 1 NIC have set gateway and others not.
so when VPN can’t access these have not gateway NICs, just access which have gateway NIC.
The problem is that they don-t have a gateway configured
So, imagine a NIC has 192.168.23.17/24 with no gateway configured.
Now a packet from 172.16.23.199 arrives from a VPN connection. As this obviously does not match the server’s subnet, it can’t send a reply back.
Either configure static routes or default gateways.
-Chris