In message <5D36713D8A4E7348A7E10DF7437A4B920122BD2C@SZXEML506-MBS.china.huawei .com>, Sheng Jiang writes: > > In message <[email protected]>, Brian E Carpenter writes: > > > On 2011-08-12 11:47, Mark Andrews wrote: > > > > I think it is make work > > > > > > That's why I am only suggesting an IESG decision, not a draft > > > and an RFC. > > > > > > > and won't change the amount of confusion. > > > > In addition A6 allows compresssion of the domain name in the rdata > > > > so it can't be treated as unknown (i.e. a opaque blob) by > > nameservers. > > > > > > If it's historic, servers shouldn't even contain any A6 records, > > > surely? > > > > Making something historic doesn't remove the old software or the > > old records. Removing knowledge of A6 from recursive server will > > result in garbage A6 records being delivered to old clients that > > are A6 aware. A6 aware clients still work as they ask for both > > AAAA and A6 records. > > Yes, your statement are right. However, the case of A6 is there are few curre > nt A6 software or records. As far as I know, there are no commercial A6 suppo > rts in the current global DNS system. A6 only existed in some experimental sy > stem, like 6net. So, what we are worried here is not these existing A6. By mo > ving A6 into historic, we are preventing any NEW A6 implementation or deploym > ent. > > Sheng
The root servers are getting 100's of A6 q/s (~20:1 AAAA:A6 <http://k.root-servers.org/statistics/GLOBAL/daily/>). There is still a very large base of A6 using software out there regardless of whether they are getting NODATA responses or not. I don't know what percentage of responses are NODATA and what have actual A6 records. I do think we need to know answers to these sorts of questions. Mark > > One needs a phase out plan if you want to remove A6 support and it > > is likely to need to be decades long given how long people run old > > nameservers for. > > > > > > If one wants to do something about IPv6 addresses in the DNS add > > > > support for scoped addresses. Link-local could then be useful. > > > > > > Different topic, and I suspect much more complex. > > > > > > Brian > > -- > > Mark Andrews, ISC > > 1 Seymour St., Dundas Valley, NSW 2117, Australia > > PHONE: +61 2 9871 4742 INTERNET: [email protected] > > -------------------------------------------------------------------- > > IETF IPv6 working group mailing list > > [email protected] > > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > > -------------------------------------------------------------------- > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > [email protected] > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: [email protected] -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
