kern/117293: CARP interfaces causes packet loss

Klavs Klavsen kl at
Thu Oct 18 03:50:01 PDT 2007

>Number:         117293
>Category:       kern
>Synopsis:       CARP interfaces causes packet loss
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Oct 18 10:50:01 UTC 2007
>Originator:     Klavs Klavsen
>Release:        6.2-Release-p7
FreeBSD 6.2-RELEASE-p7 FreeBSD 6.2-RELEASE-p7 #8: Tue Oct 16 16:11:14 CEST 2007     root at  i386

fping (and ping -f) pinging through the firewall, gives me
a packet loss. fping in nagios, reports up to 55% packet loss :( - a ping
-f gives me 1-3%, but bad enough :(

pinging from the firewall itself, to one of the hosts, that packets are
lost to (when pinging from other networks) does not give any packet loss.

If I disable the CARP config in /etc/rc.conf.local, using the same firewall rules (except for changing the $if vars back to bge0/em0 etc.) the packet loss is gone.

I did not have a backup (CARP wise) host running during my tests.
Setup CARP.


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