Re: [Autoconf] Using DHCPv6 without link-local? Support only EUI-64interfaces?
Alexandru Petrescu <alexandru.petrescu@gmail.com> Mon, 02 August 2010 19:37 UTC
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Date: Mon, 02 Aug 2010 21:37:55 +0200
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Subject: Re: [Autoconf] Using DHCPv6 without link-local? Support only EUI-64interfaces?
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Le 02/08/2010 18:55, Ulrich Herberg a écrit : > Teco, > > On Sat, Jul 31, 2010 at 3:56 PM, Teco Boot<teco@inf-net.nl> wrote: >> Fred, >> >> Do you mean DHCP relay can be used on a node, that request an >> address for itself? > > I have tried that a while ago. It works with some limitations (see > below). > >> >> I think it could work this way: 1) Node queries with link-local to >> All_DHCP_Relay_Agents_and_Servers. 2a) Node acts as also relay and >> queries with ULA (site-local) to All_DHCP_Servers. > > Do you mean that a node is DHCP client and relay in the same time? > That is not possible according to RFC3315, which says (i) in section > 15.13 "clients MUST discard any received Relay-forward messages" and > (ii) section 15.3 "servers and relay agents MUST discard any > received Advertise messages". Ah! This is seem to contradict something in MEXT context where draft-ietf-mext-nemo-pd-05 proposes "This relay agent function is co-located in the MR with the DHCPv6 client function (see Figure 2)." > Also, the relay would need to have a direct unicast connection to the > central node or use other relaying mechanisms such as SMF (as you > mentioned below), because multiple relaying is not really feasible in > DHCPv6 itself: Relaying uses encapsulation, so packets would be ^^^^^^^^^^^^^^^^ Clarification: yes, relaying implies encapsulation when Relay relays to another Relay, but when Relay to Server - it's non-encapsualted. > encapsulated at every hop, quickly increasing overhead. And I also > don't think that DHCP relaying allows duplicate packet detection. Duplicate packet detection? What is it for? Alex >> 2b) If node is provisioned with DHCP server unicast address, it >> could use that instead of All_DHCP_Servers. > > Sure, that is possible if a unicast routing protocol is used. > >> I think this is in line with your RFC 5558. >> >> Drawback of 1: it can result in high number of relayed DHCP >> packets, in case of many neighbors. > > True. > >> Another drawback of 1: there is a timeout delay when there is no >> relay or server at one hop. > > But I guess this timeout can be set dynamically? > >> >> For 2a: the network needs multicast support. Could be SMF. > > Yes, that could be a possibility. > > >> >> For both 2a and 2b: a temporally used unicast address must be >> routable. So this DHCP mechanism can only be used as a second >> step, moving from the self-generated address to a centrally >> managed address. > > Yes, that seems possible (but I have to re-read the DHCPv6 RFC after > my vacations ;-) > > Ulrich > >> >> Teco >> >> >> >> >> Op 30 jul 2010, om 17:40 heeft Templin, Fred L het volgende >> geschreven: >> >>> Teco, >>> >>>> -----Original Message----- From: autoconf-bounces@ietf.org >>>> [mailto:autoconf-bounces@ietf.org] On Behalf Of Teco Boot >>>> Sent: Friday, July 30, 2010 4:58 AM To: autoconf@ietf.org >>>> autoconf@ietf.org Subject: [Autoconf] Using DHCPv6 without >>>> link-local? Support only EUI-64interfaces? >>>> >>>> RFC3315: ... The client MUST use a link-local address >>>> assigned to the interface for which it is requesting >>>> configuration information as the source address in the header >>>> of the IP datagram. >>>> >>>> Question: can we get around a MUST in a standards track RFC? I >>>> don't think so. >>> >>> If the MANET router only behaves as a client on an internal link >>> (e.g., a loopback) but behaves as a relay on its MANET >>> interfaces, then link-locals need not be exposed for DHCPv6 >>> purposes. There are other reasons why link-locals might need to >>> be considered for MANETs, but I'm not sure this is one of them. >>> >>> Fred fred.l.templin@boeing.com >>> >>>> The to be posted proposed text for to be RFC5889 would say >>>> that if link-locals are used, there are potential problems >>>> when using other than modified EUI-64 IIDs, and therefore must >>>> be based on modified EUI-64 IIDs. >>>> >>>> Second question, on first item in charter: do we limit ourself >>>> to MANET routers that has modified EUI-64 link-locals? I >>>> think: better think twice. >>>> >>>> Opinions? >>>> >>>> Teco. >>>> >>>> >>>> _______________________________________________ Autoconf >>>> mailing list Autoconf@ietf.org >>>> https://www.ietf.org/mailman/listinfo/autoconf >> >> _______________________________________________ Autoconf mailing >> list Autoconf@ietf.org >> https://www.ietf.org/mailman/listinfo/autoconf >> > _______________________________________________ Autoconf mailing list > Autoconf@ietf.org https://www.ietf.org/mailman/listinfo/autoconf >
- [Autoconf] Using DHCPv6 without link-local? Suppo… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Dearlove, Christopher (UK)
- Re: [Autoconf] Using DHCPv6 without link-local? S… Templin, Fred L
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Dearlove, Christopher (UK)
- Re: [Autoconf] Using DHCPv6 without link-local? S… Alexandru Petrescu
- Re: [Autoconf] Using DHCPv6 without link-local? S… Alexandru Petrescu
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Alexandru Petrescu
- Re: [Autoconf] Using DHCPv6 without link-local? S… Dearlove, Christopher (UK)
- Re: [Autoconf] Using DHCPv6 without link-local? S… Dearlove, Christopher (UK)
- Re: [Autoconf] Using DHCPv6 without link-local? S… Templin, Fred L
- Re: [Autoconf] Using DHCPv6 without link-local? S… Ulrich Herberg
- Re: [Autoconf] Using DHCPv6 without link-local? S… Templin, Fred L
- Re: [Autoconf] Using DHCPv6 without link-local? S… Ulrich Herberg
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Alexandru Petrescu
- Re: [Autoconf] Using DHCPv6 without link-local? S… Ulrich Herberg
- Re: [Autoconf] Using DHCPv6 without link-local? S… Henning Rogge
- Re: [Autoconf] Using DHCPv6 without link-local? S… Ulrich Herberg
- Re: [Autoconf] Using DHCPv6 without link-local? S… Rogge Henning
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Henning Rogge
- Re: [Autoconf] Using DHCPv6 without link-local? S… Teco Boot
- Re: [Autoconf] Using DHCPv6 without link-local? S… Carlos Jesús Bernardos Cano
- Re: [Autoconf] Using DHCPv6 without link-local? S… Alexandru Petrescu
- Re: [Autoconf] Using DHCPv6 without link-local? S… Joe Macker