1
0
mirror of git://projects.qi-hardware.com/openwrt-xburst.git synced 2024-11-14 23:50:37 +02:00
openwrt-xburst/package/iptables/files/l7/ntp.pat
hauke 398b94811b [iptables] Update layer7 rules
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@15544 3c298f89-4303-0410-b956-a3cf2f4a3e73
2009-05-01 15:20:34 +00:00

18 lines
649 B
Plaintext

# (S)NTP - (Simple) Network Time Protocol - RFCs 1305 and 2030
# Pattern attributes: good fast fast overmatch
# Protocol groups: time_synchronization ietf_draft_standard
# Wiki: http://www.protocolinfo.org/wiki/NTP
# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
#
# This pattern is tested and is believed to work.
# client|server
# Requires the server's timestamp to be in the present or future (of 2005).
# Tested with ntpdate on Linux.
# Assumes version 2, 3 or 4.
# Note that ntp packets are always 48 bytes, so you should match on that too.
ntp
^([\x13\x1b\x23\xd3\xdb\xe3]|[\x14\x1c$].......?.?.?.?.?.?.?.?.?[\xc6-\xff])