Re: [load balancing] F5 LTM & MAC addresses

From: Catalin Matei <catalin_matei_se [izzat] hotmail.com>
Date: Mon Nov 26 2007 - 23:47:17 EST

the below is all true If MAC masquerading is enabled in both F5 boxes; this setting goes into bigip_base.conf and basically describes a unique MAC address that is to be used in conjunction with VIP in case of failover.
All nicely described on AskF5 page.
Cheers,
KTL
> From: zafer [izzat] prolink.com.tr> To: lb-l [izzat] vegan.net> Date: Mon, 26 Nov 2007 16:33:52 +0200> Subject: Re: [load balancing] F5 LTM & MAC addresses> > 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> _______________________________________________> lb-l mailing list> lb-l [izzat] vegan.net> http://vegan.net/mailman/listinfo/lb-l> Searchable Archive: http://vegan.net/lb/archive> http://lbdigest.com Load Balancing Digest
_________________________________________________________________
News, entertainment and everything you care about at Live.com. Get it now!
http://www.live.com/getstarted.aspx

_______________________________________________
lb-l mailing list
lb-l@vegan.net
http://vegan.net/mailman/listinfo/lb-l
Searchable Archive: http://vegan.net/lb/archive
http://lbdigest.com Load Balancing Digest
Received on Mon Nov 26 23:47:50 2007

This archive was generated by hypermail 2.1.8 : Mon Nov 26 2007 - 23:47:51 EST