I have a server that has a connection to 3 networks.
Eth0 connected to my internal LAN (my classroom)
Eth1 connected to my ISP
Eth2 connected to my school's LAN

My classroom is separated because I have my own internet connection.  I need to be connected to my schools LAN now because my server sync's data with my schools servers.

My problem is that when teachers from my school connect to my server by domain name it seems to be timing out a lot of the time.

My routing table on the server is...

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.6.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
24.148.112.0    0.0.0.0         255.255.255.0   U     0      0        0 eth1
192.168.8.0     192.168.40.1    255.255.255.0   UG    0      0        0 eth2
192.168.40.0    0.0.0.0         255.255.254.0   U     0      0        0 eth2
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
0.0.0.0         24.148.112.252  0.0.0.0         UG    100    0        0 eth1
0.0.0.0         192.168.40.1    0.0.0.0         UG    100    0        0 eth2