Mailinglist Archive: opensuse (2234 mails)

[bshelton@xxxxxxxxxxxxxx (Brad Shelton)]

On Wed, Sep 01, 1999 at 04:58:27PM -0700, Mike Payson wrote:
> Well, now that I resolved the speed problem, a new-- hopefully simple--
> problem has cropped up. This machine ahndles IP masquerading for our
> small network. We have two Windoze machines & this one connected to the
> net via DSL. I can get out to the net from here, and I can ping the
> other two machines. They can ping me. But, when they try to access the
> net, they don't succeed-- but the activity lights on the router do
> flicker, so apparently there signal IS reaching the router. 
> 
> I presume that I either changed a setting someplace while trying to fix
> the previous problem, or something is handled differently in 6.2, but
> everything looks right to me... Any suggestions are appreciated!

What kernel were you using before?

If 2.0.x then you were perhaps using ipfwadm? If 2.2.x then ipchains?

Any differences there?

Use tcpdump to see if masquerading is working.

If the internal, non-routeable addresses are pinging out, tcpdump will show
them requesting ICMP but not receiving it back.

It would be really nice if you could telnet to an accessible outside host and
run tcpdump there, or know the sysadmin and ask them to run it for you to
see if the requests are being received/returned.

That will tell you for sure if masquerading is working or not.

In other words, if the requests go out with the internal, non-routeable
addresses, they won't be returned because masquerading isn't working. If
they're going out with the gateway's address, then masquerading is working
and something else is wrong.


-- 
Brad Shelton  On Line Exchange  http://online-isp.com

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