Re: nating on linux

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  You cross-posted this into too many mailing lists.  I saw it in
  linux-net, so that's where I am sending my reply to.

On Thu Apr 12 2001 at 09:19, Lee Leahu wrote:

> i have two network connections.
> 
> one is to my company with the lan useing the 192.168.0.0 subnet,
> and the other is to a client using the same subnet.
> 
> i wanted to know if it was possible to setup some kind of nating on my laptop
> in such a way, that will translate the client's entire 192.168.0.0 subnet
> into a 10.168.0.0 subnet on by laptop.
> 
> i printed the man pages for ipchains, but i'm not sure how and where
> to start.
> 
> if anyone can help, that would be appreciated.
> 
> i'm runing SuSE 7.1 2.4.0-4GB kernel on my ibm 600E latop.

If the network with your client's lan is on eth1 and the other lan
on eth0, then do it like this:

	ipchains -I forward -i eth0 -j MASQ

That will masquerade (nat) _everything_ being _forwarded_ to the
eth0 interface as coming from that box (your laptop).

If you don't want everything masqueraded, then make the rule more
specific, like this:

	ipchains -I forward -i eth0 -j MASQ -s 192.168.200.0/24

which will only masquerade packets with a 192.168.200.0/24 source
address.

Easy, no?  :-)

Oh, 2.4.x kernel?  Then "modprobe ipchains" before you do this.

Or, alternatively, "modprobe ip_tables" and use similar rules with
/sbin/iptables to achieve the same thing.

Cheers
Tony
  Network and Systems Administration, RHCE
  LinuxWorks for networking   : tony@linuxworks.com.au
  Consultant, GrowZone OnLine : tony@growzone.com.au
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