Linux routing problem

[sco21]

LinuxA
A 10.0.7.1 B 10.0.7.2
| |
| |
| |
C D
10.0.7.3 10.0.7.4
LinuxB LinuxC

I have 3 linux servers LinuxA LinuxB LinuxC. LinuxA has two network cards. LinuxB & LinuxC connected to LinuxA with crossover cables.LinuxA pings B,C. LinuxB pings LinuxA A card and B card but it can't ping LinuxC and reverse.

If anyone can give a tip

Thanks!

 

[ericbrunson]

Have you enabled IP forwarding?

 

[marsd]

Dump route -n on linuxA for us please.