Re: Source address in response always the same as target address in request?

Guys,

In both the NTPv4 specification and reference implementation the destination address used by the client when mobilizeing the association and sending the request must match the source address when receiving the response. This is a property of all RPC protocols known to me that use addresses to match requests with responses. This is so obvious a requirement that maybe the specification doesn't make it clear enough.

Dave

Brian Utterback wrote:
guuwwe@xxxxxxxxxxx wrote:

Are there any clear requirements in NTP/SNTP RFC docs about the UDP
source address in
all responses the same as the UDP target address in the original
requests?
I doubt it would be a UDP requirement because this is domain of upper
protocols.



Yes and no. The basic protocol does not require it. The reference
implementation does require it. The Autokey crypto authentication
scheme currently requires it, but there has been some discussion
recently about the nature of that requirement and whether it could
be relaxed, but I don't see that discussion going anywhere in this
regard.

Brian Utterback
.