o Document net.inet.ip.random_id sysctl.
Reviewed by: dwmalone, ru
This commit is contained in:
parent
99c8d0836d
commit
4892c9a4c0
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=133757
@ -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 ,
|
||||
|
Loading…
Reference in New Issue
Block a user