Multiple gateways in a network

[Felipe Nunez <gatopardo verizon net do>]

  Hi :
      I'm having trouble using more than a gateway and Fedora Core 2. 
   I  need to connect a particular computer -let's say with private 
   address 192.168.2.23/24  to internet. The gateway to internet have 
   address 192.168.2.10/24.  At the same time we have another gateway 
   with addresses 192.168.30/24   and 192.168.1.10/24 to connect to 
  the other network (192.168.1.0/24)

    Working with only one gateway is easy. But with the 2 of them at the 
  same time allows connection to the internet just during the first minutes,
  later connection to internet is lost, not so the other local network.

    What are we missing. I'm embarrassed to ask for advice, but the 
  documentation read so far has not being of any help.

   F Nunez  ( Linux counter # 273870 )