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How to configure alias on local loopback for load balancing with DSR

  • 1.  How to configure alias on local loopback for load balancing with DSR

    Posted Wed April 09, 2008 01:30 PM

    Originally posted by: andreas_de


    Hello folks,

    our customer wants to use Direct Server Return (DSR) loadbalancing for FTP access to two AIX systems (AIX 5.3 still on TL5).
    You may have a look at the attached pdf, which briefly describes DSR.

    The point is: For Direct Server Return to work, one have to set an alias on the local loopback interface inside AIX.
    This alias is the same IP for both AIX systems.

    For Linux one would do a ifconfig lo:0 174.122.20.220 netmask 255.255.255.0 -arp up

    For AIX we tried ifconfig lo0 alias 174.122.20.220 netmask 255.255.255.0 -arp up on both AIX Systems.

    The result was that network connectivity became very poor, sometimes you get ftp / ssh connect, sometimes not, 60% ping packet loss.

    So what did we do wrong?
    The local loopback alias method is also documented for Sun Solaris inside the pdf file.

    May it be, that the -arp option in the ifconfig command inside AIX globally turns off adress resolution protocol function?
    Can this be the cause of the poor ethernet function (a ifconfig ... arp didn't work - after rebooting AIX everything was fine).

    I think for direct server return, only arp for the alias on local loopback should be turned off.
    How do we do this in AIX?

    kind regards

    Andreas
    from Hamburg / Germany
    #AIX-Forum


  • 2.  Re: How to configure alias on local loopback for load balancing with DSR

    Posted Wed February 15, 2012 04:59 PM

    Originally posted by: SystemAdmin


    Hi,

    You need put the mask as 255.255.255.255

    Regards
    #AIX-Forum