I tried these steps with windows XP, I have got 3 PCs (A,B,C) all of them XP, PC B with 2 NIC cards, I assigned 10.0.0.2 to one of these NIC, and 11.0.0.2 to another NIC(this form PC with 2 NIC). PC A ip address:10.0.0.5 PC C ip address: 11.0.0.5 I was able to ping from PC A (10.0.0.5) to 11.0.0.2,i.e I get across the NIC cards, but not to 11.0.0.5!!!! I was able also to ping from PC C (11.0.0.5) to 10.0.0.2,i.e I get across the NIC cards, but not to 10.0.0.5!!!!!. Any clue Thanks 1- WinXP’s RIP disabled by default. 2- I enabled IP forwarding, through regedit, initially only on B, it did not work, then on all PCs, same it did not work also. 3- Make the two NIC cards gateways of each other . I have similar scenario with windows 2000 advanced server it has 2 NIC cards, one for the internet and the IP is assigned to it via DHCP, the IP is 200.229.140.56, And the other NIC card (for my LAN) and its IP address is 192.168.0.1, and it assigns IP addresses to the rest of my LAN (6 PCs) via DHCP through Cisco switch. From any PC on my LAN I can ping the IP address 192.168.0.1 and as well 200.229.140.56,,,,,i.e I can get across the NIC cards. Though I have not touch RIP or IP forwarding, even I have not made the two NIC on my sever as gateways of each other.

I figured out where was the problem

I figured out where was the problem which is? i_XpUser