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tcp.7: Correct description for TCP_MAXSEG on modern kernel 

In tcp.7, about TCP_MAXSEG, it reads

    If this option is set before connection establishment,
    it also changes the MSS value announced to the other
    end in the initial packet.

It is correct for kernel version 2.2, but it is not
correct for modern kernel such as 2.4 and 2.6.
On a linux box with a modern kernel, the setting for
TCP_MAXSEG won't change the MSS value announced to the
other end.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
lepton 2012-04-23 21:17:09 +12:00 committed by Michael Kerrisk
parent 42bd5b3db0
commit 84b183e9f7
1 changed files with 3 additions and 2 deletions
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man7/tcp.7
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@ -13,7 +13,7 @@
.\" be more or less up to date and complete as at Linux 2.6.27
.\" (other than the remaining FIXMEs in the page source below).
.\"
.TH TCP 7 2012-03-20 "Linux" "Linux Programmer's Manual"
.TH TCP 7 2012-04-23 "Linux" "Linux Programmer's Manual"
.SH NAME
tcp \- TCP protocol
.SH SYNOPSIS
@ -888,7 +888,8 @@ This option should not be used in code intended to be portable.
.B TCP_MAXSEG
.\" Present in Linux 1.0
The maximum segment size for outgoing TCP packets.
If this option is set before connection establishment, it also
In Linux 2.2 and earlier,
if this option is set before connection establishment, it also
changes the MSS value announced to the other end in the initial packet.
Values greater than the (eventual) interface MTU have no effect.
TCP will also impose