Hi friends,
I have two ethernet cards in a Linux BOX.The arrangement is like this.

College Network-->Eth0 --- Eth1----> My intranet


Explanation:
I have connected eth0 to college lan and it has class B IP address and the other is connected to a peer linux machine with a RJ45 cabling. eth1 has class C IP address

Problem:
The problem is that i can't get ping from a system in college lan to my dual card linux machine when it can ping to its peer.
Similarly when i reconfigure some way that i get pinged from a system in college lan, i can't get the ping from peer.
As i am newbie i can't figure where the problem is..
How to forward packets from my eth0 to eth1. How can this be done in code or Is there any other way...


please help me,
madhavan

was this class C address assigned to you by the people who manage the college network or did you just make it up yourself?

the class C address was assigned by us with the guidance of the network administrator and another important thing we dont have class C address domain within our college.......
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madhavan

Sorry, this is not going to help you much. This can be done, but you really need to read about linux routing. Google for "linux routing" and that should get you started.

Try http://www.linuxrouter.org/

more to the point you need to make sure that your college network has routes to the class C you assigned or it won't work anyway.

Or you could use NAT on your class C network and all data coming out will look like it's from your laptop's "public" interface (eth0 on the class B college LAN.)

Try http://tldp.org/HOWTO/IP-Masquerade-...-examples.html for information on this type of setup. It works just as well from private network to private network, just remember that in your case the school's private class B network is the "external" network.