> -----Original Message----- > From: james woodyatt [mailto:[email protected]] > Sent: Monday, March 23, 2009 6:48 PM > To: [email protected] Discussion > Cc: Dan Wing > Subject: Re: [nat66] Fwd: I-D Action:draft-iab-ipv6-nat-00.txt > > On Mar 23, 2009, at 14:26, Fred Baker wrote: > > On Mar 23, 2009, at 2:05 PM, Keith Moore wrote: > > > >> B thinks its traffic arrived at a ULA, but B presumably can't use > >> that > >> ULA as a referral address as it won't work everywhere, > > > > http://tools.ietf.org/html/draft-wing-behave-nat64-referrals > > "Referrals Across a NAT64", Dan Wing, 4-Mar-09, > > <draft-wing-behave-nat64-referrals-00.txt> > > An interesting thing about this document: it doesn't discuss > P2PSIP. > I went looking to see how P2PSIP would be affected by NAT66, and the > answer seems to me that P2PSIP uses TURN for doing NAT > traversal (see > the highly amusing > <http://tools.ietf.org/html/draft-ietf-behave-turn-ipv6>), > but its bootstrap service is defined as a SIP registrar and > proxy, which depends on DNS64 to achieve the referral transparency > described in the draft Fred mentions. > > I've a feeling that NAT66 complicates the bootstrap process > for P2PSIP overlays, but I'm not sure how.
The P2PSIP device would need to know its publicly-routable IPv6 address. Very much like with an IPv4 NAT (needs to know publicly-routable IPv4 address) or NAPT (needs to know publicly-routable IPv4 address and port). > I don't think I see how P2PSIP > bootstrap servers can be deployed behind NAT66 without > tightly coupled > coordination with the NAT, http://tools.ietf.org/html/draft-thaler-ipv6-saf describes this in some detail. > and I wonder about Fred's ideas about > hairpin denial in that case... Hairpinning of media traffic is avoided by ICE and RFC3484 address preference rules. I know P2PSIP uses ICE for its media traffic. I doubt P2PSIP prevents hairpinning of the P2PSIP signaling traffic for IPv4 NATs. So it is unlikely that it prevents hairpinning of P2PSIP signaling traffic in the presence of an IPv6 NAT (NAT66). But I am not well-versed in P2PSIP; perhaps it does some sort of optimization. -d _______________________________________________ nat66 mailing list [email protected] https://www.ietf.org/mailman/listinfo/nat66
