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o Document net.inet.ip.random_id sysctl.

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Reviewed by:	dwmalone, ru
This commit is contained in:
Maxim Konovalov 2004-08-15 17:32:31 +00:00
parent 99c8d0836d
commit 4892c9a4c0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=133757
1 changed files with 12 additions and 1 deletions
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share/man/man4/inet.4
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@ -32,7 +32,7 @@
.\" From: @(#)inet.4 8.1 (Berkeley) 6/5/93
.\" $FreeBSD$
.\"
.Dd July 2, 2004
.Dd August 15, 2004
.Dt INET 4
.Os
.Sh NAME
@ -288,6 +288,17 @@ This
.Xr sysctl 8
variable affects packets destined for a local host as well as packets
forwarded to some other host.
.It Va ip.random_id
Boolean: control IP IDs generation behaviour.
Setting this
.Xr sysctl 8
to non-zero causes the ID field in IP packets to be randomized instead of
incremented by 1 with each packet generated.
This closes a minor information leak which allows remote observers to
determine the rate of packet generation on the machine by watching the
counter.
Default is 0 (sequential IP IDs).
IPv6 flow IDs and fragment IDs are always random.
.El
.Sh SEE ALSO
.Xr ioctl 2 ,