Re: [dhcwg] additional option for dhcpv6
Mark Stapp <mjs@cisco.com> Mon, 21 January 2002 14:54 UTC
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Date: Mon, 21 Jan 2002 09:44:31 -0500
To: Vijay Bhaskar A K <vijayak@india.hp.com>
From: Mark Stapp <mjs@cisco.com>
Subject: Re: [dhcwg] additional option for dhcpv6
Cc: dhcwg@ietf.org
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Vijay, 1) FQDN Option. I really think that we should use a single option that can convey both a complete FQDN or a partial 'hostname'. It's unnecessary to try to specify two options and the relationship between them. Certainly, there's no need to include the RCODE fields that were part of the v4 FQDN option: like the two name encodings in the v4 version, those fields were left in place because there was a large base of deployed clients who expected those fields to be present. I'd suggest that we specify the same method that's used in the v4 option to distinguish between fully-qualified and unqualified names: if the last label in the name field is null-length, the name is fully-qualified. If a client believes it knows a complete FQDN, it sends that name and terminates it accordingly. If it only knows a partial name, it sends the labels it knows. > There needs to be > specification about hosts who do not initially know their entire fqdn. > There needs to be a way to communicate about which party (if any) will be > updating DNS. It's probably on my plate to produce that, actually. >For the temporary addresses, DNS update is done by server. So, these >fields are not necessary. As I said, I think that DNS updates will be performed by different parties in different environments, just as they are in IP4 networks. The option must contain enough information to permit a network's administrators to influence the choice of updater for zones that are under their control. Like Bernie, I don't know what you mean here when you claim that no additional data is necessary. Your claim that temporary addresses' updates will be done by servers is a little confusing to me. Why do you assume that? You imply that non-temporary updates are clearly understood to be the responsibility of one party. I disagree: I think that the years of field experience we have demonstrates that there are a variety of valid dns update models. > > > > 2) The subnet-selection option text should not compel the server to > somehow > > obey the client's suggestion. It should be explict that the server > > administrator's configuration takes precedence, and that the client's > > indication that it desires a specific subnet can only be a hint that's > > considered along with all of the other information available to the server. > >This is the only way the client can tell its prefernce for the prefix. >If the server is not supposed to allocate address for that prefix, then >it wont. If the client is not very particular about the prefix, it >should not use this option. This option will be more helpful in the >network with two prefixes and the client wants a particular one. I think that the specification must be clear about the behavior that the paragraph in your reply describes. The server MAY consider the subnet specified as it considers the other information available to it about its allocation policies and about the client. > > > > 4) The 'Service Location Protocol Directory Agent Option' places the > > 'typed-scope-list-len' field before the 'DA address', rather than before > > the 'typed scope list'. Couldn't the length of the list immediately > precede > > the list? > >I think, it won't make any difference. Let me know, if there are any >serious issues on this. There are so many examples of the field len/field value convention that I think it's much clearer to continue using that convention unless there's a very good reason not to. I don't think that there is such a reason in this case, and I think that it will make the specification and implementation of this option more robust if we retain that convention. -- Mark _______________________________________________ dhcwg mailing list dhcwg@ietf.org https://www1.ietf.org/mailman/listinfo/dhcwg
- [dhcwg] additional option for dhcpv6 Vijay Bhaskar A K
- Re: [dhcwg] additional option for dhcpv6 Ted Lemon
- Re: [dhcwg] additional option for dhcpv6 Mark Stapp
- RE: [dhcwg] additional option for dhcpv6 Bernie Volz (EUD)
- Re: [dhcwg] additional option for dhcpv6 Vijay Bhaskar A K
- RE: [dhcwg] additional option for dhcpv6 Bernie Volz (EUD)
- RE: [dhcwg] additional option for dhcpv6 Vijayabhaskar A K
- RE: [dhcwg] additional option for dhcpv6 Jim Bound
- RE: [dhcwg] additional option for dhcpv6 Jim Bound
- RE: [dhcwg] additional option for dhcpv6 Bernie Volz (EUD)
- Re: [dhcwg] additional option for dhcpv6 Mark Stapp
- RE: [dhcwg] additional option for dhcpv6 Terrance Humphries
- Re: [dhcwg] additional option for dhcpv6 Vijay Bhaskar A K
- RE: [dhcwg] additional option for dhcpv6 Richard Barr Hibbs
- [dhcwg] SLPv2 DHCPv6 options (was: additional opt… Erik Guttman
- [dhcwg] RE: SLPv2 DHCPv6 options (was: additional… Richard Barr Hibbs