This stuff is supposed to be basic but it gets confusing. Could someone help me understand a routing problem? I very much appreciate it; I know there are lots of characters on this page. But this problem is preventing me from scp'ing from my firewall (computer C) to fileserver (computer A), which is what I need to do. Topology Computer A (e-smith) eth1 public ip eth0 10.0.0.1 Computer B (w2K) 10.0.0.2 192.168.0.1 Computer C (rh7.1) 192.168.0.10 Computers A and C are obviously separated by computer B. PROBLEM: Computer A can ping only 10.0.0.2 and public IP's, but not anything on 192.168.0.x. Computer B can ping everything. Computer C can ping anything on 192.168.0.x and any public IP, but **cannot** ping any 10.0.0.x. **So in essence, A cannot reach C, and C cannot reach A. I told computer C how to get to A, and A how to get to C, and B how to get to A and C. But it doesn't work. What am I doing wrong. Here are the routing tables: ***Computer A Kernel IP routing table Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 10.0.0.0 * 255.255.255.0 U 0 0 0 eth0 192.168.0.0 pc-0002 255.255.255.0 UG 0 0 0 eth0 226.4.216.0 * 255.255.255.0 U 0 0 0 eth1 127.0.0.0 * 255.0.0.0 U 0 0 0 lo default 226-4-216-1.ge 0.0.0.0 UG 0 0 0 eth1 ("pc-0002" showed up after I did "route add -net 192.168.0.0/24 gw 10.0.0.2".) ***Computer B Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 10.0.0.1 10.0.0.2 1 10.0.0.0 255.255.255.0 10.0.0.2 10.0.0.2 1 10.0.0.0 255.0.0.0 192.168.0.2 192.168.0.1 1 10.0.0.2 255.255.255.255 127.0.0.1 127.0.0.1 1 10.255.255.255 255.255.255.255 10.0.0.2 10.0.0.2 1 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 192.168.0.0 255.255.255.0 192.168.0.1 192.168.0.1 1 192.168.0.0 255.255.255.0 10.0.0.2 10.0.0.2 1 192.168.0.1 255.255.255.255 127.0.0.1 127.0.0.1 1 192.168.0.255 255.255.255.255 192.168.0.1 192.168.0.1 1 224.0.0.0 224.0.0.0 10.0.0.2 10.0.0.2 1 224.0.0.0 224.0.0.0 192.168.0.1 192.168.0.1 1 255.255.255.255 255.255.255.255 10.0.0.2 10.0.0.2 1 Default Gateway: 10.0.0.1 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 10.0.0.0 255.0.0.0 192.168.0.2 1 ***Computer C Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 10.0.0.0 192.168.0.1 255.0.0.0 UG 0 0 0 eth0 127.0.0.0 * 255.0.0.0 U 0 0 0 lo default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0