Shane,
I just had a similar problem in a class I'm taking. I was building a RH7
box to do firewalling, but IP forwarding wasn't working. Here's my
suggestions, though I am probably more of a linux newbie than yourself:
Check the routing table, make sure there is a default route to your
gateway(I'm not sure how this would work with an ISP though).
I also had a sysctl file that was set to turn off IP forwarding. I can't
remember where this was located though.
Finally, the one that did it for me was the rp_filter file. In the
directory
/proc/sys/net/ipv4/conf/ there are a few directories(like ethx, all,
default) that all contain a rp_filter file. Cat those, if they return a
'1' try changing it to '0'. That is what worked for me.
-Karl
On Thu, 22 Mar 2001 12:59:41 -0800 (PST) Shane McKeown
<[EMAIL PROTECTED]> writes:
>Hi all
>
>I have just finished setting up my linux box to
>provide ip_forwarding, and have confirmed that
>ip_forwarding is active
>
>cat /proc/sys/net/ipv4/ip_forward returns a '1'.
>
>My system is Linux Mandrake 7.1, 2.2.19
>
>I can dial up to the internet from the linux box, a
>and when I ping both the linux boxes' internal and
>external IP's from another computer on my LAN
>I get replies that I can see both.
>I.e. I can ping both addresses.
>
>The problem occurs when I try to ping an external
>internet address such as www.altavista.com from
>a PC other than the Linux box. Using tracert(its
>a Win2000 PC), I can only ping as far as the linux
>box, no further.
>
>What have I missed?
>
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