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Old 21st January 2011
Abbass Abbass is offline
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Default CARP

Hello all,

We are trying to adopt CARP to build a redundant firewall using OpenBSD.
The actual network has one firewall/gateway. We installed OpenBSD on another machine and now we are looking to implement CARP.

I have a question :
I read somewhere that we can use a the current IP address of the firewall serving as the FW/gateway as the CARP virtual address?

is that ture, if so have anyone tried it?
in what versions is it supported?

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Old 21st March 2011
tinhead tinhead is offline
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We're successfully doing this in our environment. We're running a slightly outdated version of OpenBSD, 4.4 so I think you're good. If you need to look at our config (in PM), feel free to ask.
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Old 13th April 2011
mwjpiero mwjpiero is offline
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you mean the if of fw interface and carp virtual ip is the same?
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Old 13th April 2011
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phoenix phoenix is offline
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I believe on OpenBSD when you create the CARP interface, you tell it the physical device to use (carpdev option). Then you remove the IP from the physical device, and you put that IP on the CARP device.

In order to be able to connect to the individual boxes, you would add another interface to the box (or add a vLAN), and give that an IP.

Thus, between the two boxes, you would have 3 IPs:
  • the CARP IP, which is shared between the two boxes, that hosts on the LAN point to
  • the management IP for boxA
  • the management IP for boxB

It would be wonderful if the carpdev option was ported to FreeBSD...

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