Date: Fri, 11 Dec 2009 19:30:06 -0800 From: Doug Hardie <bc979@lafn.org> To: freebsd-questions - <freebsd-questions@freebsd.org> Subject: I am not understanding something about pf Message-ID: <F382ED5D-85A1-4365-9395-4D391405ACBE@lafn.org>
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I am running 7.2-Stable with pf. I have the following pf.conf: no rdr inet proto tcp from <spamd-white-local> to any port smtp no rdr inet proto tcp from <spamd-white> to any port smtp rdr pass inet proto tcp from any to any port smtp -> 127.0.0.1 port = spamd This is the basic spamd configuration with an extra table = <spamd-white-local> which lists hosts to go directly to the mail server. = Everything works properly. Hosts not in either spamd table go to spamd = and those in either spamd table go directly to the mail server. = However, the pf statistics don't seem to make sense to me. I always see = the following: no rdr inet proto tcp from <spamd-white-local> to any port =3D smtp [ Evaluations: 1193433 Packets: 0 Bytes: 0 States: = 0 ] [ Inserted: uid 0 pid 73310 ] no rdr inet proto tcp from <spamd-white> to any port =3D smtp [ Evaluations: 110124 Packets: 0 Bytes: 0 States: = 0 ] [ Inserted: uid 0 pid 73310 ] rdr pass inet proto tcp from any to any port =3D smtp -> 127.0.0.1 port = 8025 [ Evaluations: 110124 Packets: 63 Bytes: 3516 States: = 1 ] [ Inserted: uid 0 pid 73310 ] Where the first two entries never show any Packets and the third shows = everything. Does "no rdr" work differently than "rdr" with the = statistics? I understood from the Book of PF that the rules were = evaluated such that the last matching rule is used. Hence I think that = with the above conf file the spamd-white-local table would never get = used as the connection will match one of the 2 following rules. So I ran another test by putting the first rule last: no rdr inet proto tcp from <spamd-white> to any port smtp rdr pass inet proto tcp from any to any port smtp -> 127.0.0.1 port = spamd no rdr inet proto tcp from <spamd-white-local> to any port smtp Now entries in <spamd-white-local> are ignored and, the statistics are = quite different: no rdr inet proto tcp from <spamd-white> to any port =3D smtp [ Evaluations: 79 Packets: 0 Bytes: 0 States: = 0 ] [ Inserted: uid 0 pid 86983 ] rdr pass inet proto tcp from any to any port =3D smtp -> 127.0.0.1 port = 8025 [ Evaluations: 52 Packets: 25 Bytes: 1395 States: = 1 ] [ Inserted: uid 0 pid 86983 ] no rdr inet proto tcp from <spamd-white-local> to any port =3D smtp [ Evaluations: 0 Packets: 0 Bytes: 0 States: = 0 ] [ Inserted: uid 0 pid 86983 ] Now the last rule says its never evaluated. This indicates that its the = first rule that matches that is used rather than the last. However, why = are there never any packets counted in the "no rdr" rules?
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