LTM Floating IP`s mac address has gone mad!

Hi,

did you check the MAC masquerading settings on your BIG-IPs?

In TMOS v9/v10 you will find it in the VLAN settings. (v11 has it in the traffic-group configuration.)

Perhaps somebody has entered the routers MAC address and you are facing a duplicated MAC address issue?

You can run a tcpdump including the layer 2 information to check for ARPs in you network:

tcpdump -nnni  -e -c 100 'arp and host '

The sample above limits the output to 100 packets "

-c 100

" showing both ARP requests and responses related to your floating self IP and displays the ethernet header information "

-e

".

Now you can clear your servers ARP cache and force a new address resolution and watch what is happening.

Thanks, Stephan