Spurious error from i[pf]_carp

Bruce M. Simpson bms at FreeBSD.org
Sat Dec 15 17:53:38 PST 2007

Max Laier wrote:
> Alternatively you could change IPPROTO_CARP in netinet/in.h to another 
> unused protocol number.  This is really the preferred way of dealing with 
> mixed CARP and VRRP environments as the CARP packets might in turn 
> irritate the VRRP routers, too.
This sounds like a common use case. Perhaps there is motivation for 
making the protocol number used by CARP a loader tunable?

[I'd really like it if we had a kernel API for adding the virtual MAC 
addresses to ifnet too, then again I'd like the cheat for infinite 
chocolate fudge sundaes in life, bed and breakfast at The Savoy with my 
choice of actress, etc]
> /* no comment */
No disrespect to anyone intended, just that CARP does duplicate the 
functionality of VRRP.

It's worth reiterating that this is what happens when software patents 
are allowed to creep in to the nuts and bolts of the operational 
Internet -- and thus, CARP was born, and thus Tom runs into the issue he 
has seen.


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