sysctls and if_bridge

Michael Proto mike at
Sat Sep 6 02:27:17 UTC 2008

Ran into a strange problem the other day, hoping someone can shed some
light on this. Updated 8-CURRENT from 6/14 to 9/02 and noticed a strange
thing with my if_bridge interface. It appears as though the sysctls for
determining where to enable/disable filtering don't seem to be working.

My router has an IP, on its vr2 interface, which is bridged
to a second vr1 interface for my 3 other static IPs.

ifconfig_vr2="inet netmask"
ifconfig_bridge0="addm vr2 addm vr1 up"


Based on what I've read from the man pages (and how it worked before),
this should enable filtering on the vr2 and vr1 interfaces, and not the
bridge0 interface. After updating to 8-CURRENT 9/02 it appears that
these sysctl settings no longer matter, and filtering is enabled on both
the bridge and member interfaces. I ultimately had to tweak my
/etc/pf.conf and set all my inbound-from-the-Internet vr2 rules to
reference bridge0 instead. Outbound rules still use vr2, and I've
flipped both sysctl settings with no change in behavior. Traffic flows
now, but it appears these sysctls are not working as they should, or I'm
really missing something.

Michael Proto

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