Forum Discussion

Shahrzad_84598's avatar
Shahrzad_84598
Icon for Nimbostratus rankNimbostratus
Nov 04, 2015

LTM Floating IP`s mac address has gone mad!

Hi there! We have 2 BIG-IP LTM version 9.3.0, I know it s old :) These two have a floating ip between them(HA) and this ip is set on web servers as their default gateway, and it was working fine for...
application delivery
availability
floating ip
LTM
management
Stan_Ward_01_13's avatar
Stan_Ward_01_13
Icon for Nimbostratus rankNimbostratus

Not sure about the MAC address, but if this started with an IP address conflict for the floating IP, it sounds like the pair went "split brained" (active-active). So each F5 thinks that the other has gone south and that it needs to be active. But the GUI and the command line of each box would be reporting its status as "Active". If so, the cause would be loss of the HA Ethernet connection or the failover serial cable between the two boxes.

 

Shahrzad_84598's avatar
Shahrzad_84598
Icon for Nimbostratus rankNimbostratus
Nov 14, 2015
Hi Stan, Thanks for the reply, I have no log related to the floating ip conflict in LTM log files, so I don`t think that`s the case, also active-standby thing is ok. I could`t find the cause of two things: 1- Servers IP conflict (I worked around it by configuring the windows registry and turning off the gratuitous arp ) 2- Why LTM floating IP does not reply to servers on the same subnet.(Not solved, I`m going to set mac masquerade to see what happens)