Re: [dhcwg] Ben Campbell's Discuss on draft-ietf-dhc-relay-port-08: (with DISCUSS and COMMENT)

Ted Lemon <mellon@fugue.com> Thu, 30 November 2017 01:39 UTC

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From: Ted Lemon <mellon@fugue.com>
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Date: Wed, 29 Nov 2017 20:39:43 -0500
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Cc: Ben Campbell <ben@nostrum.com>, The IESG <iesg@ietf.org>, "draft-ietf-dhc-relay-port@ietf.org" <draft-ietf-dhc-relay-port@ietf.org>, dhcwg <dhcwg@ietf.org>, "dhc-chairs@ietf.org" <dhc-chairs@ietf.org>
To: "Naiming Shen (naiming)" <naiming@cisco.com>
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Subject: Re: [dhcwg] Ben Campbell's Discuss on draft-ietf-dhc-relay-port-08: (with DISCUSS and COMMENT)
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What I would suggest is that you actually just specify the behavior and not specify an update to the document.   Changing the wording around the update isn't solving the problem.   So e.g. in section 3.1:

OLD:
   This specification adds the following extension to the above
   paragraph.

      DHCP messages from a relay agent to a server are sent to the 'DHCP
      server' port (67), and the UDP source port it uses can be any
      valid UDP port available in the relay system, including the DHCP
      port 67.  The default port number is 67 if there is no explicit
      configuration for the generalized source UDP port extension for
      DHCP relay.

NEW:
Relay agents implementing this specification may be configured instead to send to a port number other than 67.   This will only work when the DHCP server or relay agent to which such a relay agent is forwarding messages is configured to listen on the same port.

And then do the same with section 3.2.

This makes the text a lot easier to follow, and doesn't imply that this document is in any way updating the base documents.