Using VMware, I set 2 hosts connected through a router. All 3 virtual computers run Ubuntu 14.10.

• Host A (eth2: 192.168.1.11/24)
• Router (eth2: 192.168.1.12/24) (eth3: 192.168.3.2/24)
• Host B (eth2: 192.168.3.1/24)

My setup has the following symptoms:

• Host A can ping 192.168.3.2, but cannot ping Host B (100% packet loss).
• Host B can ping 192.168.1.12, but cannot ping Host A (Destination Host Unreachable).
• Router can ping both hosts.

What I have done or tried so far:

• I have enabled IP forwarding (sysctl -w net.ipv4.ip_forward=1).
• I have added both hosts statically in the router's routing table.
• I did nothing on IP masquerading, since the hosts are within private networks only.

Why can't the hosts ping each other?

1 Answer

After a few hours, I solved the problem.

Host A:

route add default gw 192.168.1.12
route del default gw 192.168.1.11

Host B:

route add default gw 192.168.3.2
route del default gw 192.168.3.1

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