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git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2519 3c298f89-4303-0410-b956-a3cf2f4a3e73
18 lines
678 B
Plaintext
18 lines
678 B
Plaintext
# (S)NTP - (Simple) Network Time Protocol - RFCs 1305 and 2030
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# Pattern quality: good veryfast overmatch
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#
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# This pattern is tested and is believed to work. If this does not work
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# for you, or you believe it could be improved, please post to
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# l7-filter-developers@lists.sf.net . Subscribe at
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# http://lists.sourceforge.net/lists/listinfo/l7-filter-developers
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# client|server
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# Requires the server's timestamp to be in the present or future (of 2005).
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# Tested with ntpdate on Linux.
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# Assumes version 2, 3 or 4.
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# Note that ntp packets are always 48 bytes, so you should match on that too.
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ntp
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^([\x13\x1b\x23\xd3\xdb\xe3]|[\x14\x1c$].......?.?.?.?.?.?.?.?.?[\xc6-\xff])
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