Forwarding without real IP with 2 network cards

Vassilis Rigas <(E-Mail Removed)> wrote:
> Hi all, here 's is the senario.
>
> I got my self an ADSL connection for my home.
> I have tow PCs running:
> Machine one: FEDORA LINUX 1
> Machine tow: SUSE 8.2 & WINDOWS XP
> I 'm using a modem/router for my connection.

Since you're using a modem/router, it should be able to perform NAT.
Just get yourself a small switch (they're very cheap these days). Less
hassle that way.

Otherwise, ONE needs to act as a router, forwarding IP packets. If the
modem/router is doing NAT, then that should be all that is required for
ONE. On the ROUTER, you would need to add a static route entry for the
network of TWO, via ONE.

If you don't understand that, just get yourself a hub.

> I 'm suspecting that it could be possible with some itables lines but
> I 'm not sure because none of the machines have the real IP address.

That doesn't matter. So long as you remember that if forwarding between
public and private addresses, you need to use NAT.

> If it could work then I could use the idea to my work (60 PCs) where I
> could use a PC with double ethernet cards to do all the firewall
> work.

Don't do this at work until you have a solid understanding of iptables
and networking.

--
Cameron Kerr
(E-Mail Removed) : http://nzgeeks.org/cameron/
Empowered by Perl!

Hi all, here 's is the senario.

I got my self an ADSL connection for my home.
I have tow PCs running:
Machine one: FEDORA LINUX 1
Machine tow: SUSE 8.2 & WINDOWS XP
I 'm using a modem/router for my connection.

My first machine have 2 network cards. The second machine Just one.
I attached my first machine with my router (eth1) an with a crosswire
to my second machine (eth0).
None of my machines got any real IP (the modem/router does).
I can ping the routers IP's (fake and real) from my first machine
(ping 192.168.1.1 works fine).
I can't route directly my second machine but I can ping it from the
eth0 using th "-I" parameter of ping
(ping -I eth0 192.168.1.3 works fine).
The first machine have the IP 192.168.1.2
The question is:
Can I have Internet to both machines without using a hub?
Is is possible (considering that the first machine have internet
access) to forward pakages to the second machine too? I other words
may I use the first machine as a router?
I 'm suspecting that it could be possible with some itables lines but
I 'm not sure because none of the machines have the real IP address.
If it could work then I could use the idea to my work (60 PCs) where I
could use a PC with double ethernet cards to do all the firewall
work.

Hoping in good news