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