[SUMMARY]: How can we make a multihomed server replying on the same interface

From: Dirk Maass (dm_at_hejoe.de)
Date: 09/24/04

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    Date: Fri, 24 Sep 2004 10:30:18 +0200
To: sunmanagers@sunmanagers.org

    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 *** 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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