Dear all, Thank you, I will try this tomorrow. Keep you informed.
Regards, Florian On Thu, Sep 20, 2012 at 8:11 PM, David Boyes <[email protected]> wrote: > Can't test this at the moment, but do the system logs tell you if the > relocation generates a disconnect/reconnect event for the interface in > question? IMHO, if it doesn't, then it should, since you're doing the > equivalent of unplugging the machine, moving it, and then reconnecting it. > Even if it's reconnecting to the same VLAN, the initial ARP to make sure > you own the associated IP address should happen to avoid a race where a > duplicate IP address could come online during the migration. > > Try running arping on the Linux machine via the 3270 console after the > migration. If that fixes the problem (and it probably will), configure your > Linux guests to generate a gratuitous ARP when the network interface state > changes. That should force the FW to forget the old ARP entry and pickup > the new one. Why the gratuitous ARP is no longer the default is still a > mystery (at least to me, anyway) -- I can't conceive of a case where this > would be the wrong behavior, and a ARP flood is not likely to be caused by > a loose connector in this scenario (all virtual, all the time). > > There is probably a good argument that the VM migration code could/should > force a proxy ARP for a guest when it gets migrated, though. It has enough > information to do it (the old and new virtual MACs and the associated real > OSA MACs) and that would at least force other devices to reevaluate any > caches that might be present, even if the result ends up with the original > configuration. > > Worth a call to the support center to discuss, anyway. > > -- Best regards Florian Bilek ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
