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Old 05-06-2009, 02:27 AM   #1
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routing in linux

I got the following ip block from my ISP. (Here is my gateway which is located in my ISP's Router, My useable ip is -

I have a linux pc with 2 NIC. I have putted in my eth0 which is connected to my ISP And in my eth1. My PC is directly connected to eth1. My pc ip is and gateway is

I can't go to internet. What I have to do in linux box. ip_forward=1 is already enabled. Plz help
Old 05-06-2009, 03:34 AM   #2
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It is possible that your ISP router does not have a route to that is why the traffic is not coming back.
Old 05-06-2009, 04:38 AM   #3
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I (Tukang Nggame) have idea. Your linux pc use network

( gw Linux PC-eth1-( PC ( gw

ISP-----------------eth0--YOUR Linux PC--eth1---------Client PC

In Your Linux PC use NAT !

Last edited by arisnb; 05-15-2009 at 07:26 AM.
Old 05-06-2009, 06:05 AM   #4
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Hi am Networking and linux newbie

Can some one help me to understand,

why do we need to add route in our system or gateway to connect to different network???

what is the concept of "add route -p" command

please help
Old 05-15-2009, 07:17 AM   #5
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Simple network :
Please read this artcle
Routing :
You can add in /etc/network/interfaces

up /sbin/route add -net [network] netmask [netmask] gw [gateway]


up /sbin/route add -net netmask gw

Last edited by arisnb; 05-15-2009 at 07:22 AM.


linux, network, routing, shorewall

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