Date: Thu, 11 Sep 2014 16:54:35 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Freddie Cash" <fjwcash@gmail.com>, "FreeBSD Stable" <freebsd-stable@freebsd.org> Subject: Re: Using CARP with multiple IP aliases (FBSD 10.0) Message-ID: <FE2CFC78656D40D996B1970649E20CCF@multiplay.co.uk> References: <CAOjFWZ5_M_d3AStmkUJKk0TgesowJH-jWsKBbvZshwQ278o8ow@mail.gmail.com>
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----- Original Message -----
From: "Freddie Cash" <fjwcash@gmail.com>
To: "FreeBSD Stable" <freebsd-stable@freebsd.org>
Sent: Thursday, September 11, 2014 4:15 PM
Subject: Using CARP with multiple IP aliases (FBSD 10.0)
> Good morning,
>
> Just looking for some clarification around the proper use of CARP on
> interfaces with multiple IPs.
>
> I've been using the new CARP on FreeBSD 10.0 with great success on a pair
> of systems with lots of vlans across 3 physical NIC ports. However, those
> systems only have a single IP per vlan. The ifconfig lines are very
> simple, and everything just works the way I expect it to, failing back and
> forth between the two systems as needed.
>
> I'm now trying to get CARP working on a second pair of systems, and running
> into issues with one of the physical interfaces. I think I might be doing
> the ifconfig commands wrong, but the ifconfig(8) and carp(4) man pages
> aren't very clear on this usage.
>
> Are all of the carp-related parameters required for every IP alias added to
> an interface? Or are the pass/advbase/advskew only needed once per
> interface, and you just pass the vhid to each IP alias?
>
> Currently, I'm doing the former and having issues with both boxes claiming
> to be master for that one interface.
>
> Which is correct:
>
> ifconfig igb0 inet 1.2.3.4/24 vhid 30 pass mypass
> ifconfig igb0 inet 1.2.3.5/32 vhid 30 pass mypass alias
> ifconfig igb0 inet 1.2.3.6/32 vhid 30 pass mypass alias
> ifconfig igb0 inet 1.2.3.7/32 vhid 30 pass mypass alias
> ifconfig igb0 inet 1.2.3.8/32 vhid 30 pass mypass alias
>
> OR
>
> ifconfig igb0 inet 1.2.3.4/24 vhid 30 pass mypass
> ifconfig igb0 inet 1.2.3.5/32 vhid 30 alias
> ifconfig igb0 inet 1.2.3.6/32 vhid 30 alias
> ifconfig igb0 inet 1.2.3.7/32 vhid 30 alias
> ifconfig igb0 inet 1.2.3.8/32 vhid 30 alias
>
> Neither the ifconfig nor the carp man pages show examples with multiple IPs
> configured within the same vhid.
I believe you need a seperate vhid per IP assuming you want each to fail over
to another machine when it goes down e.g.
ifconfig igb0 inet 1.2.3.4/24 vhid 30 pass mypass
ifconfig igb0 inet 1.2.3.5/32 vhid 31 pass mypass alias
ifconfig igb0 inet 1.2.3.6/32 vhid 32 pass mypass alias
ifconfig igb0 inet 1.2.3.7/32 vhid 33 pass mypass alias
ifconfig igb0 inet 1.2.3.8/32 vhid 34 pass mypass alias
Regards
Steve
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