On 08/10/2013 20:19, Joel Jaeggli wrote: ... > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > This is a dicuss because I'd like to see if I'm in the rough in this. > > Devices generally considered to be IP routers in fact are able to or find > it necessary to forward on the basis of headers other than the IP header > e.g. the transport header. By the definition applied in the problem > statement all ipv6 capable routers in the internet that I'm aware are or > are capable of being middleboxes.
IMHO, yes, if a box is taking a forwarding decision on the basis of anything other than the first 40 bytes of an IPv6 header, then it's a middlebox as far as this draft is concerned. Any such box is not a "straightforward IP router". In the process of working on the draft I have actually corresponded briefly with Steve Deering, and I'm pretty sure he would agree with me (with added expletives). > I would welcome the existence proof of an ipv6 capable router which is > not capable of being a middlebox by the definition applied in the problem > statement. > > I'm not sure that's a glaring flaw in the document but it certainly is > with our vocabulary around taxonomy if true. > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > If you need to find the transport header due to configured policy and you > can't due to being unable to parse the extensions chain your configured > action will be to drop. That perhaps weasels it's way through section 2.1 > requirements but it's still quite ugly. Yes, and it's the reason that the Internet is mainly opaque to IPv6 extensions headers today. Brian -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------