Wednesday, July 07, 2021

PF annoying messages

HI All,
I am setting up a firewall with PF. The strategy used is quite common:
set block-policy return
set loginterface none
set skip on lo0
match in all scrub (random-id reassemble tcp)
block log

Then some rules are used to pass the authorized packets.

One of the rule is
pass from <TV_nets> to <multicast>
pass from <multicast> to <TV_nets>

where the table "multicast" contains all the multicast address and the table "TV_nets" the
networks used for IT TV.

In the log regularly the following message is produced:
Jul 07 10:44:40.049159 rule 26/(match) pass in on vlan120: 192.168.88.1 > 224.0.0.1:
igmp query [tos 0xc0] [ttl 1]

where vlan120 is part of an OpenBSD bridge used in egress part of the firewall.

A lot of similar rules (many vlan are used) and some other
pass rules are defined but only this one (26) produces a message.

Is it possible to remove a such message? The message is not useful and it clutters the log.

Thanks for your help,

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