Re: 2.2.14 and IP routing weirdness with IP aliases

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Tue May 16 2000 - 12:03:02 EDT

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    > This doesn't seem right to me. I would expect that if I send a packet to
    > the primary interface (eth0), the response would come from the primary
    > interface (eth0) and not eth0:0. This really breaks the notion of a
    > 4-tuple socket pair and is causing me some headaches with failed data
    > connections, especially backups.

    It depends on the route not the interface. The route followed defines the
    interface considered to be used and thus the source address for UDP. UDP
    is connectionless. If you wish to force the source address then its an
    application layer issue.

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