Anthony DeRobertis wrote:
# tcpdump -pn host 69.17.7.16 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 10:00:49.042270 IP 172.17.6.1.31.123 > 69.17.7.16.123: NTPv4 client, strat 2, poll 10, prec -20 10:00:49.079271 IP 69.17.7.16.123 > 172.16.1.31.123: NTPv4 server, strat 2, poll 0, prec -6
According to RFC 2030 the server is not responding correctly: "In unicast and anycast modes, the VN and Poll fields of the request are copied intact to the reply." I can't find what the client is supposed to do on receiving poll 0, but mine (ntpd 4.2.0) displays poll 4 and keeps to using poll 10 as configured. Your restrict options aren't correct if you're querying a server every second (ntp behaves really weird when you restrict it from accepting the reply), which will show up as RSTR as the refid. The ntpd.conf in your email and the list of peers output don't seem match since you're restricting everything to not accept the replies - when I test using it it'll do what you show in your tcpdump output but show RSTR as the refid. -- Simon Arlott
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