[H-GEN] [SOLVED] can't get IP forwarding/NAT working on new install

[Troy Piggins]

* Troy Piggins <troy at piggo.com> :
> 
> I've recently re-installed my gateway machine due to it being
> compromised via a horde security hole and me not keeping it up to
> date :-(
> 
> Chose Ubuntu Dapper 6.06 released only 1/6/06 since I was happy
> with my previous Ubuntu Breezy install and the new release
> supposedly has better wifi support.
> 
> All went smooth during the install *except* the computers behind
> this gateway can't access the internet.  I am tearing my hair out
> (and believe me, there aint much to tear out!) because I've set it
> up, I am sure, almost exactly the way my previous working install
> was.
> 
> By "can't access the internet" I mean that the WinXP machine can
> ping the dapper machine's LAN interface, but not it's external
> interface, nor external IP addresses let alone URLs.
> 
> eg:  WinXP machine can ping 192.168.0.1, but try to ping
> 192.168.1.10 and get "Destination host unreachable".  Sim for
> 192.168.1.1.  See below for what networks they are on.
> 
> The dapper machine connects to internet fine, resolves URLs no
> worries, can ping both internal and external networks fine.  All
> good.
> 
> I've trawled the net, Ubuntu forums, Whirlpool forums, USENET,
> Ubuntu mailing lists and can't find a solution.  It's probably
> right in front of my nose, I know.
...

SOlved.  Turned out to be a netmask in WInXP's routing table.

I did a "route -f" and now it works.

THanks to all who responded.

-- 
Troy Piggins
  ,-o   Ubuntu v6.06 (Dapper Drake): kernel 2.6.15-23-server, 
 o   )  postfix 2.2.4, procmail 3.22, mutt 1.5.11i,
  `-o   slrn 0.9.8.1, vim 6.4