Date: Tue, 27 Jan 2015 09:07:18 +0100 From: Dimitry Andric <dim@FreeBSD.org> To: Aristedes Maniatis <ari@ish.com.au> Cc: freebsd-pf@freebsd.org Subject: Re: meaning of State-mismatch Message-ID: <8A242C55-A2D7-49C2-A0CC-AFB1E447C494@FreeBSD.org> In-Reply-To: <54C74303.1070601@ish.com.au> References: <54C72F63.8040908@ish.com.au> <CD5F0D06-3738-4786-97C6-68C27D94A5B0@FreeBSD.org> <54C74303.1070601@ish.com.au>
next in thread | previous in thread | raw e-mail | index | archive | help
--Apple-Mail=_68BC1EE8-3796-4317-8254-5A246704A3F3 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 27 Jan 2015, at 08:49, Aristedes Maniatis <ari@ish.com.au> wrote: >=20 > On 27/01/2015 6:46pm, Dimitry Andric wrote: >> On 27 Jan 2015, at 07:25, Aristedes Maniatis <ari@ish.com.au> wrote: >>>=20 >>> I have been unable to find much documentation about the counter = called "state-mismatch". I notice it going up on my firewall (FreeBSD = 10.1) but only at a slow rate (maybe at around 1 per minute). >>>=20 >>> What is the significance of this value? Is it indicative of dropped = states (and I should be increasing the state timeout)? >>=20 >> It's not really documented in our pfctl(8) manpage, but the OpenBSD = version does >> mention it: >>=20 >> state-mismatch >> packet was associated with a state entry, but sequence = numbers did not >> match >>=20 >> So maybe something is dropping packets, making holes in the sequence = numbers? Or >> maybe somebody is trying something sneaky? :) >>=20 >> -Dimitry >=20 > Ah, thanks for that. Maybe you could add that doc to the FreeBSD man = page. Could it simply be a packet loss issue where a packet is lost and = the next packet arrives out of order? Well, that is just a likely cause. If you let tcpdump run for a while, you might be able to spot it, in e.g. Wireshark? -Dimitry --Apple-Mail=_68BC1EE8-3796-4317-8254-5A246704A3F3 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.26 iEYEARECAAYFAlTHRzoACgkQsF6jCi4glqMxywCguwW1n5GGmyb9DlC7jA5zbzkV HmoAoNfofcPWQByZv9fAU9DPhDdhUo4x =mJ8o -----END PGP SIGNATURE----- --Apple-Mail=_68BC1EE8-3796-4317-8254-5A246704A3F3--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?8A242C55-A2D7-49C2-A0CC-AFB1E447C494>