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smp_86112's avatar
smp_86112
Icon for Cirrostratus rankCirrostratus
Aug 24, 2010

Ping from Floating Self-IP address

Historically we've had some problems getting the arp table on the routers to update when we've had a failover event, or when we swap out hardware, etc...that sort of thing. I was hoping with v10 you could Ping using the floating self-IP address which would force an arp update without forcing a failover. Is there a better way to do this? Do I just not know how to ping using a shared self-ip?

 

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2 Replies

  • Chris_Miller's avatar
    Chris_Miller
    Icon for Altostratus rankAltostratus
    Aug 24, 2010
    Shall I assume you aren't using Mac Masquerade?

     

     

    http://support.f5.com/kb/en-us/solutions/public/7000/200/sol7214.html?sr=9645733

     

     

    Should solve all your problems since there's no ARP entry to update...I'm pretty sure there's a "ping from" logic for linux as well. Ping -I if I recall?
  • smp_86112's avatar
    smp_86112
    Icon for Cirrostratus rankCirrostratus
    Aug 24, 2010
    You caught me. We are using MAC Masquerade, which has prevented the issue from happening ever since it has been implemented (this feature pretty much saved my job, by the way, so I highly recommend it). Having just gone through four hardware migrations, I was just asking to have this in my back pocket in case I ever needed it. I tried ping -I, but I can't bind to the shared address:

     

     

    bind: Cannot assign requested address

     

     

    But ping -i uses the base self-IP. I was just hoping something had changed since 9.3.1...apparently not.