Mostafa wrote: > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use Iface > 10.5.5.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 > 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 > 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 Looks good. > I have two subnets connected to two ethernet interfaces of a cisco router > 192.168.1.0/24 and 10.5.5.0/24. > > The problem that I have is that, I cannot access the 192.168.1.20 > interface from the 10.5.5.0/24 subnet. Also, I cannot access the 10.5.5.20 > interface from the 192.168.1.0/24 subnet. However, all machines in the > 10.5.5.0/24 subnet can access the IP 10.5.5.20 and all machines in the > 192.168.1.0/24 subnet can access the IP 192.168.1.20. I think one would expect your router to transport packets across the intranet to the other interface. Perhaps I did not understand but your two subnets are connected how? Are you expecting this machine to be simply dual homed with two IP addresses, one on each subnet? Or are you expecting it to become a router and to route packets itself from one interface to another? If you want a machine with multiple interface cards to become a router then you will need to enable packet forwarding in the linux kernel. echo 1 > /proc/sys/net/ipv4/ip_forward Bob
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