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X-Original-To: nanog@nanog.org From: Owen DeLong <owen@delong.com> In-Reply-To: <564FB8C4.1070202@jsbc.cc> Date: Fri, 20 Nov 2015 17:27:43 -0800 To: Jim Burwell <jimb@jsbc.cc> Cc: NANOG <nanog@nanog.org> Errors-To: nanog-bounces@nanog.org > On 2015-11-20 15:36, Owen DeLong wrote: >>> On Nov 20, 2015, at 13:35 , Jim Burwell <jimb@jsbc.cc> wrote: >>>=20 >>> Hi, >>>=20 >>> Have a simple couple of questions here.=20 >>>=20 >>> In my admittedly cursory glances over the DHCPv6 RFCs, I don't see = any >>> reference to the protocol having any role in managing the routing of >>> prefixes it delegates. Perhaps I missed it, but I somewhat expected = the >>> omission of this responsibility would be the case. >>>=20 >>> My questions are: >>>=20 >>> 1) Does the DHCPv6 protocol include any standards/mechanisms/methods = for >>> managing routes to prefixes it delegates, or does it consider this >>> outside of its function? (I suspect the latter) >> Yes and no=E2=80=A6 >>=20 >> DHCPv6 doesn=E2=80=99t include anything specifically per se, but it = does require that >> the local router sees the DHCPv6 PD answer in the process of passing = it >> along to the target, and there=E2=80=99s a pretty obvious expectation = that said router >> will have to arrange to do the needful in that respect. >>=20 >>> 2) What are the most common ways of managing the routing of = delegated >>> prefixes in the ISPs routing domain? Has a standard method/best >>> practice emerged yet? Routing protocols? IPv6 RAs? >> RAs really only apply to subnet local advertisement of routers and >> the on-net prefixes in most implementations. >>=20 >> I don=E2=80=99t think any of the various methods of using routing = protocols, >> static pre-routed blocks from which PDs are delegated, etc. could >> necessarily be called =E2=80=9Cstandardized=E2=80=9D, but there are = probably a few >> that are more popular than most of the others. >>=20 >> Unfortunately, PD is really still in its infancy in terms of = development >> and real running code for complete implementations throughout any >> sort of site hierarchy. >>=20 >> Owen >>=20 >>=20 > Thanks for the answer Owen! >=20 > So it sounds like things are still in flux. But it least it answers = my > main question of "have I missed something here"? >=20 > Could you elaborate on the "local router seeing the PD answer" a bit? = I > presume by "local router" you mean router acting as DHCPv6 relay? Or = do > you mean the router which made the original request? I mean the router that will deliver the PD to the requesting DHCPv6 = client. If the DHCPv6 server is on-net, then this will be the requesting client. Otherwise, it will be the last relay router. > Would it be fair to say that the RFCs only really talk about = delegating > the prefixes, and leave what to do with the prefixes themselves up to > the implementer? Yes=E2=80=A6 At least at this time. Some of the work in homenet might = include some suggestions for some implementations. > I'm asking these questions because I'm doing a little class for some > folks on IPv6 and this is one area where I couldn't find answers.=20 Depending on your audience, I=E2=80=99d suggest that unless this is an = advanced IPv6 class, it=E2=80=99s probably one of those topics left for = extra-curicular research. Owen
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