From: Dirk Maass (dm@hejoe.de)
Date: Fri Sep 24 2004 - 04:30:18 EDT
Dirk Maass wrote:
> Is there a way to make that the server sends his answer packet out on
> that interface where the request arrived?
>
Thanks to all of you who replied to my question,
especially to Adam Levin who gave me more insight.
Although I haven't solved my case yet, I want to summarize because all
answers were the same: NO.
Casper Dik wrote:
> No; the information is lost as soon as the packet arrives so the
> system cannot know where to send it back.
Darren Dunham wrote:
> #2, There's not always a concept of "the answer packet". Although it
> makes a lot of sense for NFS, there's nothing that says an input
> packet has to cause an output packet. So output can be based on
> several inputs, and then there's no easy way to align them.
> ...
> My concern is that if you're
> doing UDP, there's no connection, so the sender IP address could be
> different.
Casper and Darren also suggested using NFS over TCP, "but that would
only address NFS and not the rest" (Casper)
A static host route as Drew Skinner suggested would not solve my sroblem
as there are many Firewalls not only one. I tried to set up a static
network route in the server to the network where the Firewalls are
located. But that didn't help. With tcpdump I still saw server-packets
from different IP addresses.
Adam helped me to understand that the server would send out the
UDP-packet on that interface wich it believes it's closest to the
client. So the solution may also lay in a router/network config and may
probably result in a simpler network setup.
I'll have to think about it and to discuss the problem deeper with the
networkers because I have no access to these components here.
Thank you all, again.
Dirk
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