[pfSense] Maximum CARP Addresses?

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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,

JD

[PiBa]

Hi JD,

Post by ad^2
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,
JD
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Does the pfSense box have more than 255 interfaces/vlans?
If you need multiple virtual IP's on 1 interface, you can define
multiple ip aliases under a single CARP ip. Maybe that helps..

The forum states that the old "Stacked IP Alias VIPs must be inside the
same subnet as the CARP VIP upon which they are placed." and that that
is nolonger the case.
The limit of max 255 is still there afaik..

Regards,
PiBa-NL

[Chris L]

Post by ad^2
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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Post by ad^2

Post by ad^2
Hello all,
I read in the forum (h_t_t_p_s://forum.pfsense.

org/index.php?topic=109346.0)

Post by ad^2
the 255 VHID limitation in CARP is no longer an issue in recent

versions. I

Post by ad^2
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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pfSense mailing list
https://lists.pfsense.org/mailman/listinfo/list
Support the project with Gold! https://pfsense.org/gold

Ok I understand. What are the limitations here? How many aliases can be
stacked on one CARP VIP?

Is anyone out there running +255 VIPs? My implementation will required at
least 500 floating IPs right away.

Thanks,

JD