[apalrd]

Since you are on the same subnet (I assume you are, and if you aren't then you should be) the subnet mask makes no difference.

The subnet mask is represented as the number of bits in the IP address which are... masked... from the subnet (it just happens to be represented as a nice byte.byte.byte.byte like an IP address, but it dosen't have to be). If the subnet mask is 8 (255.0.0.0) then you can communicate to any device which has the same first 8 bits (so, the same byte) as you. If the subnet mask is 24 (255.255.255.0) then the first 24 bits must be the same, but they all should be on the standard FRC configuration (they should be 10.te.am.).

So, the subnet mask is not your issue.

Do you have the D-link in bridge mode?
Are both robots configured for the correct team address?
What is the IP Address of the D-Link and Linksys routers? Certainly the D-link (and possibly the Linksys, I'm not sure) must be on the same subnet as the robot (because of the 24-bit subnet mask).

One last thing - Try connecting with Driver Station or another program (like FileZilla, there's an FTP server on the cRio) instead of using ping. I had an issue earlier in the season where pings didn't go through but data did.