Re: [load balancing] F5 LTM & MAC addresses

From: Zafer Berber <zafer [izzat] prolink.com.tr>
Date: Mon Nov 26 2007 - 09:33:52 EST

Floating ip mac address same with Active unit vlan ip mac address,
if first unit goes down floatin ip mac address will be same with second box
mac address.

regards

zafer

On Thursday 08 November 2007 12:45:09 Julian Grunnell wrote:
> 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:
>
> ltm1:
> ifconfig internal
> internal Link encap:Ethernet HWaddr 00:01:D7:3F:07:43
> 192.168.101.50
>
> ltm2:
> ifconfig internal
> internal Link encap:Ethernet HWaddr 00:01:D7:3E:EA:03
> 192.168.101.51
>
> Floating IP is 192.168.101.52
>
> 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
> 192.168.101.50 ether 02:01:D7:3F:07:42 C
> eth0
> 192.168.101.51 ether 02:01:D7:3E:EA:02 C
> eth0
> 192.168.101.52 ether 02:01:D7:3F:07:42 C
> eth0
>
> 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/
>
> This e-mail is subject to: http://www.pipex.net/disclaimer.html

-- 
Zafer Berber
System Engineer
Prolink
http://www.prolink.com.tr
Office:+90 216 573 73 00
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Received on Mon Nov 26 09:34:59 2007

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