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Re: [Ntp] I-D Action: draft-ietf-ntp-port-randomization-04.txt

Tomoyuki Sahara <tsahara@iij.ad.jp> Thu, 11 June 2020 06:51 UTC

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Date: Thu, 11 Jun 2020 15:51:36 +0900
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From: Tomoyuki Sahara <tsahara@iij.ad.jp>
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Subject: Re: [Ntp] I-D Action: draft-ietf-ntp-port-randomization-04.txt
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Thank you for updating the draft.

One comment on a new text:

>      If a client implementation performs port randomization on a per-
>      request basis, it SHOULD close the corresponding socket/port after
>      each request/response exchange.  The client SHOULD wait for
>      response packets from the server for at least 3 seconds before
>      closing the UDP socket/port, even if a successful response is
>      received.  This will prevent duplicate or delayed server packets
>      from eliciting ICMP port unreachable error messages at the client.

This concern is common to many UDP-based request/response protocols
but most protocols (if not all) do not try to deal with it.  I do not
think it is necessary to mention and recommend (by "SHOULD" word) it
in this document.


Thanks,
Tomoyuki

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