Im trying to get a very simple setup to work,
I have 2 AWS ec2 instances (blue),
instance B has a Ipsec VPN into our datacenter and can ping internal IPs of this datacenter, ie server C (192.168.40.21)
I need ec2 A instance to be able to ping and connect to server C by using B as a hop. Both A and B are on same subnet. I tried adding B's IP as a gateway on A,
[email protected]> ip route add 192.168.40.0/24 via 172.25.25.200
and also setup firewall rules on B to forward traffic (sysctl ip4 forwarding = 1),
[email protected]> iptables -A FORWARD -s 0/0 -d 172.25.25.0/24 -j ACCEPT iptables -A FORWARD -s 172.25.25.0/24 -d 0/0 -j ACCEPT iptables -t nat -A POSTROUTING -d 0/0 -s 172.25.25.0/24 -j MASQUERADE
But I cannot ping C from A. What am I missing?
All hosts are Centos 7.