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setting a gateway

Posted on 1998-09-27
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Last Modified: 2013-12-15

We have a dedicated 64kbps link to internet, we want to use linux as a gateway for our LAN.

 The set up i thought is like this.


  ---------      --------       ---------  
    LAN    |====| LINUX  | ==== | ROUTER |
  ---------      --------       ---------  

 I set up two ethernet cards in linux. I want to send packets coming from lan to router. Linux is not sending packets to second interface, How to transfer data between these two  interfaces.
We are using redhat 5.0
thanks
sarma
local lan and other is connected to an other
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Question by:sarmaas
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ahoffmann earned 150 total points
ID: 1630904
assuming your NIC connected to LAN has IP 192.168.1.1,
and you NIC connected to ROUTER has IP w.x.y.z1, and
your ROUTER has IP w.x.y.z2, then you need following:

route add -net 192.168.1.0 gw 192.168.1.1
route add -net w.x.y.0 gw w.x.y.z1
route add -net default gw w.x.y.z2


I don't know if redhat has an appropriate config file (/etc ?),
but you should add these commands anywher in the rc startup
scripts.
Also make shure that you kernel has enabled IP_FORWARDING
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