CARP carpdev

Damien Fleuriot ml at
Wed Feb 15 09:08:35 UTC 2012

On 2/14/12 11:04 PM, Hugo Silva wrote:
> On 02/14/12 17:33, Freddie Cash wrote:
>> On Tue, Feb 14, 2012 at 8:56 AM, Hugo Silva<hugo at>  wrote:
>>> Looks like there's been conversations about porting this to FreeBSD
>>> since at
>>> least 2007.
>>> Are there any plans to have ifconfig carpdev available in 9.0-STABLE?
>> CARP support has been redone in 10-CURRENT, removing the whole "carp0"
>> pseudo-interface support, and just enabling the CARP protocol on the
>> existing network interfaces. This includes the equivalent of "carpdev"
>> support.
>> Search the -current archives for more information, CFT, and so on.
>> I don't recall seeing anything about specific plans to MFC to
>> stable/9, but could be mis-remembering things.
> The single IP limitation may be a problem in some locations..
> Did not find anything about a possible MFC either. glebius@ is cc'd,
> perhaps he can add something, but based on
>, I don't think it's been
> MFCd (there's a primer for the new carp in current's UPDATING)\

I think what Gleb meant by "It also allows to run a single redundant IP
per interface" is that, like in OpenBSD, you won't need to assign a
physical IP address in the same subnet as the CARP IP you want to use,
on your system.

- 1 physical IP in subnet XY on a physical interface
- 1 virtual IP in subnet XY on a carp interface

- 1 virtual IP in subnet XY on a physical interface

Although, you're still allowed to assign a physical IP to suit your needs.

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