Re: [dhcwg] How should a DHCPv6 server respond to retransmitted packets

Ralph Droms <rdroms@cisco.com> Fri, 25 October 2002 12:43 UTC

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Date: Fri, 25 Oct 2002 08:41:00 -0400
To: Raymond Jayaraj <raymondjayaraj@yahoo.com.sg>
From: Ralph Droms <rdroms@cisco.com>
Subject: Re: [dhcwg] How should a DHCPv6 server respond to retransmitted packets
Cc: dhcwg@ietf.org, jraymond@icr.a-star.edu.sg
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In the case of Information-request, the answer is (b) or (c), depending on 
the implementation.  The responses to retransmitted Informat-request 
messages are likely to be identical, so the use of a response cache 
shouldn't affect the results of the message exchange.

- Ralph

At 10:26 AM 10/25/2002 +0800, Raymond Jayaraj wrote:
>Hi all,
>
>How should a server respond to retransmitted packets
>received after a
>REPLY packet is sent, e.g.:
>
>DHC6CLIENT      DHC6SERVER      INFOSERVER
>|               |               (e.g. LDAP)
>|               |               |
>|1)INFO-REQ     |               |
>|>>>            |               |
>|   >>>         |               |
>|      >>>      |               |
>|         >>>   |               |
>|            >>>|2)processing/retrieve info
>|3)INFO-REQ     |>>>>>>>>>>>>>>>|
>|>>>            |<<<<<<<<<<<<<<<|
>|   >>>      <<<|               |
>|      >>><<<   |               |
>|      <<<>>>   |               |
>|   <<<      >>>|               |
>|<<< 4)REPLY    |5)???          |
>
>What should (5) be? Should the server:
>
>a) drop (3) and subsequent duplicates (base on
>transaction id).
>
>b) reprocess the request and retransmit the reply,
>i.e. do (2)&(4)
>    again.
>
>c) retransmit the reply, i.e. do (4) again.
>
>d) do any of the above (implementation specific).
>
>No indication for the above could be found in the
>draft. I suspect
>it should be a) or d), but it'd be nice to know for
>sure.
>
>------------------------------------------------------------------------
>Raymond J. Jayabal                 | ICR, A-STAR
>jraymond@icr.a-star.edu.sg         | 20 Science Park
>Rd #02-34/37
>Tel: +65 6870 9330                 | Singapore 117674
>------------------------------------------------------------------------
>
>
>
>
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