[load balancing] F5 LTM & MAC addresses

From: Julian Grunnell <julian.grunnell [izzat] pipex.net>
Date: Thu Nov 08 2007 - 05:45:09 EST

Hi - apologies if this is not really the correct forum for this, but have
been unable to find any out about this from F5 documention. Its about MAC
address ... not very exciting but I have 2 LTMs in an ACTIVE / STANDBY
configuration and the MAC addresses of the internal vlans are shown as:
ifconfig internal
internal Link encap:Ethernet HWaddr 00:01:D7:3F:07:43

ifconfig internal
internal Link encap:Ethernet HWaddr 00:01:D7:3E:EA:03
Floating IP is
If I ping these IPs from a Linux box behind the LTM and then view the arp
table I get:
arp -n
Address HWtype HWaddress Flags Mask
Iface ether 02:01:D7:3F:07:42 C
eth0 ether 02:01:D7:3E:EA:02 C
eth0 ether 02:01:D7:3F:07:42 C

So why are there subtle differences between them? Like the begining is 02
and the end 42 & 02?
Thanks - J.

Julian Grunnell
3rd Line Technical Support
Pipex Communications

Tel: 01296 300227
Mob: 07803 649593
Web: http://www.pipex.com/

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Received on Thu Nov 8 05:45:38 2007

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