Re: [Autoconf] Using DHCPv6 without link-local? Support only EUI-64 interfaces?
Alexandru Petrescu <alexandru.petrescu@gmail.com> Mon, 02 August 2010 12:29 UTC
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Date: Mon, 02 Aug 2010 14:29:37 +0200
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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To: Teco Boot <teco@inf-net.nl>
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Subject: Re: [Autoconf] Using DHCPv6 without link-local? Support only EUI-64 interfaces?
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Le 02/08/2010 14:07, Teco Boot a écrit : > Op 2 aug 2010, om 10:51 heeft Alexandru Petrescu het volgende > geschreven: > >> I was thinking about the same thing as you say: if RFC5889 forbids >> link local addresses and new Charter wants DHCP then how could both >> work? > > The document doesn't say "forbid". Right, RFC5889-to-be does not say "forbid". 5889-to-be: > Note that while link-local addresses are assumed to be "on link", > the utility of link-local addresses is limited as described in > Section 6. Ok, DHCPv6 could leave with this, thinking that the utility of link-local addresses is only during the initial DHCP exchanges (Solicit-Advertise I believe). 5889-to-be (without WG discussion Maastricht): > Note that while an IPv6 link-local address is assigned to each > interface as per [RFC4291], in general link-local addresses are of > limited utility on links with undetermined connectivity, as > connectivity to neighbors may be constantly changing. The known > limitations are: > > o There is no mechanism to ensure that IPv6 link-local addresses are > unique across multiple links, hence they cannot be used to > reliably identify routers (it is often desirable to identify a > router with an IP address). > > o Routers cannot forward any packets with link-local source or > destination addresses to other links (as per [RFC4291]), while > most of the time, routers need to be able to forward packets to/ > from different links. Although DHCP Relay sits on a router, DHCP is not "most of the time" in that a DHCP Relay will use its global address although the Client sent a Solicit using its link-local address - Relay duplicates the packet. > Therefore, autoconfiguration solutions should be encouraged to > primarily focus on configuring IP addresses that are not IPv6 link- > local. This is fine, because DHCP would configure an IP address on Client which is not link-local but global. Of course this DHCPv6-LL analysis should change when we get the more final RFC5889-to-be text. Alex
- [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