I'm having a problem getting NTP packets to pass through my firewall. My NTP client (MRTech ClockAlign) has three options for protocol to use. . .SNMP, which works fine, and standard NTP via UDP or TCP, neither of which does. The downer on this is that SNMP NTP requests have the least info of all types, I'm told.
I have defined NTP on my definitions as dest. port 37 UDP/TCP, send.port 1024:65535. I have then created a rule in the packet filters that says "Any" NTP from "Any" allow.
Nevertheless, when I try to sync my clock using MRTech on TCP or UDP the packet filter shows the following:
11:51:30 192.168.0.33 2008 -> 192.5.41.40 37 TCP SYN
11:51:30 192.168.0.33 2009 -> 192.5.41.40 37 TCP SYN
11:51:34 192.168.0.33 2009 -> 192.5.41.40 37 TCP SYN
11:51:34 192.168.0.33 2010 -> 192.5.41.40 37 TCP SYN
and with UDP:
11:54:02 192.168.0.33 2074 -> 192.5.41.40 37 UDP
11:54:06 192.168.0.33 2076 -> 192.5.41.40 37 UDP
11:54:10 192.168.0.33 2079 -> 192.5.41.40 37 UDP
11:54:14 192.168.0.33 2081 -> 192.5.41.40 37 UDP
11:54:18 192.168.0.33 2083 -> 192.5.41.40 37 UDP
Switch it to SNMP and it's fat & happy.
Any clues?
Thanks
Dan
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