diff options
author | Tim Small <tim@buttersideup.com> | 2009-10-16 20:00:04 +0100 |
---|---|---|
committer | Harald Welte <laforge@gnumonks.org> | 2009-10-25 10:58:23 +0100 |
commit | 22bdd6966f2c3ccded984a37ba0b97470bcf9323 (patch) | |
tree | 67837effd91fc49bb45733c2f84c481edf627503 | |
parent | 94aa2ea67d7b8a669e8541f094661a1dc89722a3 (diff) |
doc: update TCPMSS manpage with Linux 2.6.25 changes
References: http://bugs.debian.org/551272
[j.eng: modified --set-mss option description to be understandable]
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
-rw-r--r-- | extensions/libxt_TCPMSS.man | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/extensions/libxt_TCPMSS.man b/extensions/libxt_TCPMSS.man index dbab918d..b5cb455f 100644 --- a/extensions/libxt_TCPMSS.man +++ b/extensions/libxt_TCPMSS.man @@ -34,9 +34,17 @@ configuration like: \-j TCPMSS \-\-clamp\-mss\-to\-pmtu .TP \fB\-\-set\-mss\fP \fIvalue\fP -Explicitly set MSS option to specified value. +Explicitly sets MSS option to specified value. If the MSS of the packet is +already lower than \fIvalue\fP, it will \fBnot\fP be increased (from Linux +2.6.25 onwards) to avoid more problems with hosts relying on a proper MSS. .TP \fB\-\-clamp\-mss\-to\-pmtu\fP Automatically clamp MSS value to (path_MTU \- 40 for IPv4; \-60 for IPv6). +This may not function as desired where asymmetric routes with differing +path MTU exist \(em the kernel uses the path MTU which it would use to send +packets from itself to the source and destination IP addresses. Prior to +Linux 2.6.25, only the path MTU to the destination IP address was +considered by this option; subsequent kernels also consider the path MTU +to the source IP address. .PP These options are mutually exclusive. |