Date: Tue, 5 Aug 2025 22:28:09 GMT From: Kristof Provost <kp@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 17ac89e1dfc3 - main - pf.conf.5: rework the text on mtu and mss Message-ID: <202508052228.575MS93i014357@gitrepo.freebsd.org>
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The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=17ac89e1dfc3b34658b5430ae860e88085876896 commit 17ac89e1dfc3b34658b5430ae860e88085876896 Author: Kristof Provost <kp@FreeBSD.org> AuthorDate: 2025-07-18 16:58:51 +0000 Commit: Kristof Provost <kp@FreeBSD.org> CommitDate: 2025-08-05 22:27:15 +0000 pf.conf.5: rework the text on mtu and mss According to some notes from sthen; ok sthen Obtained from: OpenBSD, jmc <jmc@openbsd.org>, 7f29e7e980 Sponsored by: Rubicon Communications, LLC ("Netgate") --- share/man/man5/pf.conf.5 | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/share/man/man5/pf.conf.5 b/share/man/man5/pf.conf.5 index 8954e872c231..1c40765f908a 100644 --- a/share/man/man5/pf.conf.5 +++ b/share/man/man5/pf.conf.5 @@ -27,7 +27,7 @@ .\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE .\" POSSIBILITY OF SUCH DAMAGE. .\" -.Dd July 9, 2025 +.Dd July 18, 2025 .Dt PF.CONF 5 .Os .Sh NAME @@ -855,7 +855,15 @@ modifier to ensure unique IP identifiers. .It Ar min-ttl Aq Ar number Enforces a minimum TTL for matching IP packets. .It Ar max-mss Aq Ar number -Enforces a maximum MSS for matching TCP packets. +Reduces the maximum segment size (MSS) +on TCP SYN packets to be no greater than +.Ar number . +This is sometimes required in scenarios where the two endpoints +of a TCP connection are not able to carry similar sized packets +and the resulting mismatch can lead to packet fragmentation or loss. +Note that setting the MSS this way can have undesirable effects, +such as interfering with the OS detection features of +.Xr pf 4 . .It Xo Ar set-tos Aq Ar string .No \*(Ba Aq Ar number .Xc
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