Re: [dhcwg] How should a DHCPv6 server respond to retransmitted packets
"Raymond J. Jayabal" <raymondjayaraj@yahoo.com.sg> Sat, 26 October 2002 23:08 UTC
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From: "Raymond J. Jayabal" <raymondjayaraj@yahoo.com.sg>
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References: <4.3.2.7.2.20021025083729.00b859d8@funnel.cisco.com>
Subject: Re: [dhcwg] How should a DHCPv6 server respond to retransmitted packets
Date: Sat, 26 Oct 2002 02:28:29 +0800
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Hi, Stumbled upon what may or may not be a problem, given that (b) is an acceptable alternative to (c), as follows. * * * Whether (b) or (c), the client will receive 2 or more REPLY packets. As the client will leave its 'waiting-for-REPLY' state when it receives REPLY #1, I assume it will drop REPLY #2 and subsequent REPLY packets and configure itself based on REPLY #1. Further assume that the server (or the network it serves, or the information services it rely on to satisfy client requests) is in State-1 when request #1 arrives, and State-2 when request #2 arrives. If (b) is allowed, then the REPLY packets will differ in content. Since REPLY #2 is last to leave the server, it would have committed to memory that it sent State-2 data to the client, whereas the client would have configured itself with State-1 data. This doesn't seem to be a good situation in the general sense, even if it happens for a short while. In case of (c), both client and server will always be synchronised. When State-2 happens, server will know exactly which clients need updating. Does this disqualify (b) as an alternative? Or is it still an acceptable implementation? - Ray ----- Original Message ----- From: "Ralph Droms" <rdroms@cisco.com> To: "Raymond Jayaraj" <raymondjayaraj@yahoo.com.sg> Cc: <dhcwg@ietf.org>; <jraymond@icr.a-star.edu.sg> Sent: Friday, October 25, 2002 8:41 PM Subject: Re: [dhcwg] How should a DHCPv6 server respond to retransmitted packets > 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 > >------------------------------------------------------------------------ > > > > > > > > > >__________________________________________________ > >Do You Yahoo!? > >Great flight deals, travel info and prizes! > >http://sg.travel.yahoo.com > >_______________________________________________ > >dhcwg mailing list > >dhcwg@ietf.org > >https://www1.ietf.org/mailman/listinfo/dhcwg __________________________________________________ Do You Yahoo!? Great flight deals, travel info and prizes! http://sg.travel.yahoo.com _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] How should a DHCPv6 server respond to ret… Raymond Jayaraj
- Re: [dhcwg] How should a DHCPv6 server respond to… Ralph Droms
- Re: [dhcwg] How should a DHCPv6 server respond to… Raymond J. Jayabal
- Re: [dhcwg] How should a DHCPv6 server respond to… Raymond J. Jayabal