LinuxQuestions.org - linux routing

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pls help me out, how to set up routing on linux server

Easy.

Enable routing (the exact procedure varies from distribution to distribution, but in the end it all boils down to writing a "1" to /proc/sys/net/ipv4/ip_forward)
Add/remove routes from the routing table (with ip route add <network>/<prefix> via <gateway> or route add -net <network>/<prefix> gw <gateway>)
Optional: Install a routing daemon like Quagga or Bird and set up a routing protocol

If you want more specific advice, you'll need to ask a more specific question.

To permanently set ip forwarding do this:

Code:

vi /etc/sysctl.conf

net.ipv4.ip_forward = 1    #change the value from 0 to 1, save and exit



sysctl -p /etc/sysctl.conf  #run this command so that it can read the updated sysctl.conf file



service network restart  # restart the network service

You can configure Linux Box as a router using below scenario :

1. PC/Server with two lan cards.

Code:

 i.eth1=>conteting internal LAN 192.169.10.xxx

 ii.eth0=>connecting Internet i.e external network (Here your public IP is connected ex: 68.68.2.1)

2.Set IP forwarding :

Code:

#vi /etc/sysctl.conf:

net.ipv4.ip_forward = 1

To enable the changes made in sysctl.conf you will need to run the command:

Code:

sysctl -p /etc/sysctl.conf

3.configure IPTABLES to allow routing

Code:

iptables -F

Code:

# iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE

# iptables --append FORWARD --in-interface eth1 -j ACCEPT

Code:

iptables -L