On Feb 15, 2018, at 11:35 AM, ad^2 <adsquai...@gmail.com> wrote:
> Hello all,
> I read in the forum (h_t_t_p_s://forum.pfsense.org/index.php?topic=109346.0)
> the 255 VHID limitation in CARP is no longer an issue in recent versions. I
> cannot find any documentation to support it.
> I have a need to host a lot more than 255 virtual IP addresses.
> Can someone confirm or deny this. If it's true point me to the
> documentation that states this. If not, is there a way around it?
> Thanks in advance,

jimp was referring to the requirement that a CARP VIP must be contained in the 
same subnet as the interface address. Removal of that requirement/limitation is 
what changed.

The VHID is 8 bits and you can’t use 0 so 1-255.

As discussed there, make IP Alias VIPs and assign them to CARP VIPs. They will 
go up and down with CARP MASTER/BACKUP status and will result in no additional 
multicast traffic per VIP. Try it I think you’ll like it.

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