On 13/08/2015 17:23, Mikael Abrahamsson wrote: > On Thu, 13 Aug 2015, Brian E Carpenter wrote: > >>> I still don't understand what a host with an IA_NA or IA_PD that isn't >>> covered by an on-link PIO should do with a packet sourced >>> from those IA_NA/IA_PD addresses. Yes, I do believe this to be a very valid >>> case. >> >> I think we're saying: there needs to be a PIO if it matters which first-hop >> router such a host picks. If it doesn't matter (i.e. there is a complete >> local >> routing cloud with SADR, or there is no BCP 38 filter) then the host can >> use any first-hop router it wants. > > Can it be an L=0 PIO?
I would think so. L=0 conveys no information, after all, according to RFC 4861: "When not set the advertisement makes no statement about on-link or off-link properties of the prefix." So I think the -01 draft is wrong, since it says "on-link." Brian > >> How the router knows to send that PIO is not a problem for the host, >> therefore not in scope in this draft. (But there's no doubt in my mind that >> life is simpler if you don't use DHCPv6.) > > Of course, but the use-case of having IA_NA that isn't covered by an on-link > PIO Is useful in some scenarios (where for instance > you have configured the L2 network so that devices can't talk directly to > each other, and you want to make the L3 configuration > reflect this so you don't have to do magic tricks like local-proxy-arp > (whatever that would be called in IPv6)). > _______________________________________________ homenet mailing list homenet@ietf.org https://www.ietf.org/mailman/listinfo/homenet