[ntp:questions] NTP client basic

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Sun Mar 4 22:49:53 UTC 2007

>When the repeats still appeared in my own SNTP client implementation (now 
>trapped, but logged), it seemed to me that I might have stumbled on a 
>possible source of trouble. RFC2030 didn't seem to say that you MUST take 
>steps to discard repeats which COULD arise in the underlying UDP protocol, 
>it seemed to be saying that you could keep an eye on the xmit timestamp in 
>the request - but it's not essential.  RFC768 (which describes UDP) doesn't 
>shed any light on whether a corrupted UDP packet could be repeated.

It's possible but very very unlikely for the network to duplicate
a packet.

Is your code retransmitting if you don't get an answer?  If so, a
likely explanation is that you aren't waiting long enough.  In
any case, your code should filter out duplicates and/or process
them correctly.

These are my opinions, not necessarily my employer's.  I hate spam.

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