• Subject: Re: At wit's end with IP filtering
  • From: "Fred Kulack" <kulack@xxxxxxxxxx>
  • Date: Mon, 22 Jan 2001 09:55:42 -0600
  • Importance: Normal

> --> (initial request)
> --> (request forwarded to Linux box!)
> --> (response from Linux box to router)
> --> (response finally returned to me)

> Notice how the router handles the port forwarding... it sends a request
> the destination device, but only after spoofing the source address to be
> realworld address of the router! I don't have the time to sit and think
> through; I'd think you would just leave the real source address in place,
> else pass the WAN address of the router (not the realworld address).

Based on other posts, I'm sure you'll fix your original problem
after you get your default route set up correctly so that the AS/400 knows
how to route any address NOT on your local subnet (i.e. isn't
on the same subnet as 10.10.10.x), you should be fine.

But back to the configuration problem/weirdness that you didn't have time
to think about.

If you're communicating between two machines on the same local subnet,
there's no reason
for them to use the router unless they are incorrectly configured.

Although you always need a default route for IPs on different subnets
(as described in the previous posts), the to is a
direct hop.
i.e. The and the system should be able to talk
going through the router.

This is usually determined automatically by the TCP/IP stack due to
the correct setting of your subnet mask.
Not exactly sure how this one could get hosed up since its done
automatically most times.

| This is the JAVA/400 Mailing List!
| To submit a new message, send your mail to JAVA400-L@midrange.com.
| To subscribe to this list send email to JAVA400-L-SUB@midrange.com.
| To unsubscribe from this list send email to JAVA400-L-UNSUB@midrange.com.
| Questions should be directed to the list owner: joe@zappie.net

As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.