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| -rw-r--r-- | share/man/man4/inet.4 | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/share/man/man4/inet.4 b/share/man/man4/inet.4 index cc5881e..1cf0220 100644 --- a/share/man/man4/inet.4 +++ b/share/man/man4/inet.4 @@ -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 , |
