|[chrony-users] Interop with NTP version 1 and 4 clients|
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Chrony is working very well as an NTP server (not a stratum 1 of
course). However, certain client requests get no answer and others get a
Some clients use the SNTP protocol, which I believe is also known as NTP
version 1? Those clients do not receive an answer at all. This is
unfortunate since they are SIP phones and have no other way of acquiring
Here is the tcpdump of a client indicating NTPv4 but receiving an NTPv3
answer. The client then proceeds to ignore that answer and repeats the
15:03:55.712716 IP (tos 0x0, ttl 59, id 0, offset 0, flags [DF], proto UDP (17), length 76)
x.x.x.x.1011 > y.y.y.y.ntp: NTPv4, length 48
Client, Leap indicator: (0), Stratum 0 (unspecified), poll 0s, precision 0
Root Delay: 0.000000, Root dispersion: 0.000000, Reference-ID: (unspec)
Reference Timestamp: 0.000000000
Originator Timestamp: 0.000000000
Receive Timestamp: 0.000000000
Transmit Timestamp: 3570271435.694462001 (2013/02/19 15:03:55)
Originator - Receive Timestamp: 0.000000000
Originator - Transmit Timestamp: 3570271435.694462001 (2013/02/19 15:03:55)
15:03:55.712877 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 76)
y.y.y.y.ntp > x.x.x.x.1011: NTPv3, length 48
Server, Leap indicator: (0), Stratum 4 (secondary reference), poll 0s, precision -19
Root Delay: 0.009262, Root dispersion: 0.019210, Reference-ID: 184.108.40.206
Reference Timestamp: 3570271416.234727978 (2013/02/19 15:03:36)
Originator Timestamp: 3570271435.694462001 (2013/02/19 15:03:55)
Receive Timestamp: 3570271435.712715923 (2013/02/19 15:03:55)
Transmit Timestamp: 3570271435.712865889 (2013/02/19 15:03:55)
Originator - Receive Timestamp: +0.018253916
Originator - Transmit Timestamp: +0.018403917
By the way, what happened to the gmane mailing list subscription? The last mail on gmane is from 2009...
Thanks for a great piece of software!
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