From the ftp url I provided earlier, download and apply 
carp-111303.diff first, then apply carp-111403.diff.
 
carp-111403.diff contains a fix to the "IP Address already in use" problem.
        NetBSD's arp_ifinit doesn't allow the ethernet address to be 
specified, so I added a function called carp_notify to if_arp.c.  It 
does exactly the same thing as arp_ifinit, but allows carp to pass the 
carp multicast ethernet address for the gratuitous arp.  There's got to 
be a better way to do it.  Anyone have any suggestions?  Or would you 
just leave it like that?
 
-- I get "incorrect hash" messages now, but not all the time.  I'm not 
sure what the problem is.. I should start calling my mods CRAP instead 
of CARP.  The hash is one part of the code I haven't spent much time on 
as of yet.




Michael Hertrick wrote:

> I posted PR misc/23431 (should have been kernel?) for experimental 
> CARP support for -current.  (only tested on i386 -current)
>
> The OpenBSD man page for CARP just about sucks right now, so I put my 
> own documentation in the PR.  Here's a link to the man page anyway:
> http://www.openbsd.org/cgi-bin/man.cgi?query=carp&apropos=0&sektion=4&manpath=OpenBSD+Current&arch=i386&format=html 
>
>
> The impatient can download the patches from 
> ftp://63.251.83.132/pub/NetBSD/patches/carp-111303.diff
> You'll have to add the following to your kernel config file:
>
> pseudo-device   carp   2
> options   CARP
>
> You may or may not also want to change vrrp to carp in 
> /etc/protocols...  OpenBSD pretty much replaced all references to VRRP 
> with CARP.  My patches, like OpenBSD's implementation, use 224.0.0.18 
> and protocol id 112 for advertisements (same as VRRP).  The vhid is in 
> the same location as VRRP's vrid in the advertisement.  Since there 
> are 256 id's to choose from, you should'nt have any problem using CARP 
> and VRRP on the same LAN.
>
>
>
> There's still a lot to do, this is just enough to get started.  The 
> rest of the details are in the PR.
>
> ~Mike.
>
>