Re: [dhcwg] whether/how to support Confirm with sedhcpv6
"Bernie Volz (volz)" <volz@cisco.com> Sun, 26 March 2017 14:44 UTC
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From: "Bernie Volz (volz)" <volz@cisco.com>
To: 神明達哉 <jinmei@wide.ad.jp>
CC: "dhcwg@ietf.org" <dhcwg@ietf.org>
Thread-Topic: [dhcwg] whether/how to support Confirm with sedhcpv6
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Date: Sun, 26 Mar 2017 14:44:49 +0000
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Subject: Re: [dhcwg] whether/how to support Confirm with sedhcpv6
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Hi: Good point ... I was thinking that encrypted Confirm (or Rebind) would be fine - if still on same link (or at least server) it would work just fine. Otherwise, client times out and is left to use other mechanisms (RS/RA)? But using Information-Request is interesting. Wonder if doing both or falling back to Information-Request after short period (note that if client determined it needed new leases, it would do Information-Request anyway). We can add to discussion at Thursday DHC WG meeting as we hoped to get some issues regarding draft that could use discussion. - Bernie (from iPhone) > On Mar 26, 2017, at 9:32 AM, 神明達哉 <jinmei@wide.ad.jp> wrote: > > While reviewing ietf-dhc-sedhcpv6-21, I've realized one thing that > probably requires a discussion: whether/how to use sedhcpv6 for > Confirm. To avoid distraction I'm raising it separately from the full > review I'm planning to submit later. > > When a client might want to send a Confirm, it should be reasonably > possible that the client has moved and would be talking to a different > server. In that case it doesn't make sense to encrypt the Confirm > message and encapsulate it in an Encryption-query message; the actual > server would silently discard it, and the client can't tell whether > it's because it has moved or the message is simply lost. So I think > we need some special case handling here. A couple of choices I can > think of are: > - say sedhcpv6 can't support Confirm (I don't like this option) > - have the client perform a separate information-request/reply > exchange to see if the currently recognized server and its public > key are still usable (if not, the client should basically not send > the Confirm, following the sense of RFC7844). > > (There may be other options.) > > -- > JINMEI, Tatuya > > _______________________________________________ > dhcwg mailing list > dhcwg@ietf.org > https://www.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] whether/how to support Confirm with sedhc… 神明達哉
- Re: [dhcwg] whether/how to support Confirm with s… Bernie Volz (volz)
- Re: [dhcwg] whether/how to support Confirm with s… 神明達哉
- Re: [dhcwg] whether/how to support Confirm with s… Ted Lemon
- Re: [dhcwg] whether/how to support Confirm with s… Bernie Volz (volz)
- Re: [dhcwg] whether/how to support Confirm with s… Ted Lemon