carpX: incorrect hash with IP aliases

Eirik Øverby ltning at
Tue Mar 3 07:22:27 PST 2009


whenever I configure an extra IP on one of my CARP interfaces, traffic  
on that particular subnet slows to a crawl (the primary IP of the  
interface is the gateway IP), and I get lots of
  carp4: incorrect hash
in dmesg.

I see this issue referenced also in
and there are suggestions this is a known issue - however I still see  
it in FreeBSD 7.1 (pfSense 1.2.3-prerelease). I cannot find a PR on  
this, but my searching skills may be inadequate..

Am I doing something wrong? I tried assigning the alias with both /32  
and /24 netmasks.


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