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| author | kris <kris@FreeBSD.org> | 2001-06-01 10:02:28 +0000 |
|---|---|---|
| committer | kris <kris@FreeBSD.org> | 2001-06-01 10:02:28 +0000 |
| commit | e1524eb20ca44614d4942a0b92929a02e67dce44 (patch) | |
| tree | 9bd8aa0fc8cabc5d0cc01510f30e42d4a12277e2 /sys/i386 | |
| parent | 83f8b7087fd25f91158a6a096fad46b33b513773 (diff) | |
| download | FreeBSD-src-e1524eb20ca44614d4942a0b92929a02e67dce44.zip FreeBSD-src-e1524eb20ca44614d4942a0b92929a02e67dce44.tar.gz | |
Add ``options RANDOM_IP_ID'' which randomizes the ID field of IP packets.
This closes a minor information leak which allows a remote observer to
determine the rate at which the machine is generating packets, since the
default behaviour is to increment a counter for each packet sent.
Reviewed by: -net
Obtained from: OpenBSD
Diffstat (limited to 'sys/i386')
| -rw-r--r-- | sys/i386/conf/NOTES | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/i386/conf/NOTES b/sys/i386/conf/NOTES index fae6298..1485762 100644 --- a/sys/i386/conf/NOTES +++ b/sys/i386/conf/NOTES @@ -590,6 +590,13 @@ options IPFILTER_DEFAULT_BLOCK #block all packets by default options IPSTEALTH #support for stealth forwarding options TCPDEBUG +# RANDOM_IP_ID causes the ID field in IP packets to be randomized +# instead of incremented by 1 with each packet generated. This +# option closes a minor information leak which allows remote +# observers to determine the rate of packet generation on the +# machine by watching the counter. +options RANDOM_IP_ID + # Statically Link in accept filters options ACCEPT_FILTER_DATA options ACCEPT_FILTER_HTTP |
