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Old 01-06-2005, 12:06 PM   #1
Registered: Feb 2004
Distribution: FC4,RHEL4
Posts: 223

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How to allow traffic from One Network to Other???

If I have Linux PC1 with eth0 say and and eth1 say which is connected through crossover wire to another Linux pc2 with eth0 say 192.168.10 then how can i use Internet on PC2 that i am able to use on PC1 by using Proxy id of my Organisations Proxy Server???
Old 01-06-2005, 12:17 PM   #2
Registered: Jul 2004
Location: Chandigarh
Distribution: RedHat 9.0
Posts: 34

Rep: Reputation: 15
You can do this by setting up iptables on your pc 1.

Create a file "rc.firewall" in /etc/rc.d folder and write the following in it.
modprobe iptable_nat
iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
iptables -A FORWARD -j LOG
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
#######end of script###########

Now save this file and give it execute permission.....

now open /etc/rc.init for editing and append the following line at the end


asve the file and run rc.firewall from the shell

now on pc2

open your network settings and give the gateway adderss as save and restart network

now try to ping your organisations proxy host... if everything works fine give the proxy settings as that on pc1...

Internet should work on pc2



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