linux router
 

I have three pcs. They are referred as:

pcA:
NIC 192.168.1.2,
subnet mask: 255.255.255.0
default gateway 192.168.1.1

pcB:
NIC 192.168.2.2,
subnet mask: 255.255.255.0
default gateway 192.168.2.1

pcRouter: two NICs:
eth0 192.168.1.1, subnet mask: 255.255.255.0
eth1 192.168.2.1, subnet mask: 255.255.255.0
this command is executed:
echo 1 > /proc/sys/net/ipv4/ip_forward

when I ping from pcA:
ping 192.168.2.2

ping returned:
From 192.168.1.1 icmp_seq=1 destination Host Prohibited

Have you set your IP tables rules to route the packets?

one of the easiest way to do it is NAT:
iptables -t nat -A POSTROUTING -i eth0 -o eth1 -j MASQUERADE
iptables -t nat -A POSTROUTING -i eth1 -o eth0 -j MASQUERADE

that should work correctely

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