Berkeley CSUA MOTD:Entry 37079
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2024/11/23 [General] UID:1000 Activity:popular
11/23   

2005/4/5-8 [Computer/SW/OS/Linux] UID:37079 Activity:nil
4/5     Does anyone know how Linux decides which interface to use when there
        are multiple on the same subnet?  The routing code is pretty hairy
        and I don't want to have to go through it all right now.  It seems
        clear that routing lookup are cached, so as long as the cache entry
        is present the interface is fixed for a src/dst pair.  But I haven't
        waded through the slow lookup yet. --jwm
        \_ I think it uses the first one that matches. run route -n
           Why would you haev multiple interfaces on the same subnet?
           \_ Short answer customers make strange choices. Basically
              I'm working with a device that has an interface that does
              work, and one for admin.  sometimes they end up on the same
              subnet.  But I can also see it being used to increase BW for
              something like iSCSI.
2024/11/23 [General] UID:1000 Activity:popular
11/23   

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