On this topic, I would strongly suggest to read RFC3901: DNS IPv6 Transport Operational Guidelines.
- Alain. On Jun 1, 2010, at 3:17 AM, <[email protected]> <[email protected]> wrote: > DS-lite doesn't require the first DNS server be dual stack. Even the first > DNS server is dual stack, its IPv4 address is difficult to delivery to the B4 > element. > > But, some DNS servers, at least one, in the ISP's network, have to be dual > stack. They receive type A DNS requests contained in IPv6 packets and forward > the requests to relevant IPv4 DNS server in current IPv4 Internet using IPv4 > packets. Otherwise, all the A records in current Internet have to be mirrored > to the IPv6 DNS servers in the ISP's network. I think this is impossible. > > I agree with Med's comments. IPv4 traffic should be offloaded if possible. > > -------------------------------------------------------------------------------- > > Zhenqiang Li > 13911635816 > Department of Network Technology > China Mobile Research Institute > 2010-06-01 > > -------------------------------------------------------------------------------- > > 发件人： Lee, Yiu > 发送时间： 2010-05-31 10:45:20 > 收件人： [email protected]; [email protected] > 抄送： > 主题： Re: [Softwires] DNS question about DS-lite > > No. DS-lite doesn't require dual-stack DNS server. It needs normal DNS > server running in the IPv6 network, and B4 proxies the v4 request over v6. > > I want to echo Med's comment in his previous email. It is not recommended to > use AFTR to reach DNS server over v4 even thought it is possible. This will > increase the AFTR load for obvious reason. > > > On 5/30/10 10:38 PM, "[email protected]" > <[email protected] > wrote: > >> Hi, > > Yes, DNS server in the ISP must be able to resolve all the A and AAAA >> records. Does DS-lite require dual stack DNS server(s), i.e. DNS server(s) >> with both IPv4 and IPv6 addresses, be deployed in the ISP's network? Dual >> stack DNS server(s) needs to connect the DNS system in the IPv6-only network >> and that in the IPv4-only Internet. > > Best >> Regards, > --------------------------------------------------------------------- >> ----------- > Zhenqiang Li > 13911635816 > Department of Network Technology > China >> Mobile Research >> Institute > 2010-05-31 > > -------------------------------------------------------- >> ------------------------ > > 发件人： Lee, Yiu > 发送时间： 2010-05-26 22:33:25 > 收件人： >> [email protected]; Durand, Alain; [email protected] > 抄送： > 主题： Re: >> [Softwires] DNS question about DS-lite > > The B4 element contains a DNS proxy >> that will support DNS over v4 and proxy > the DNS messages to the DNS server >> over v6 in the ISP network. The DNS > server in the ISP must be able to resolve >> all the A and AAAA records. > > > On 5/26/10 5:26 AM, >> "[email protected]" > <[email protected] > wrote: > >> Hi >> Alain, >> I have one question about DS-lite. Would you please clearify it? >> Thanks. >> >> In your draft, you mention the B4 element can only get the >> IPv6 address >> of a DNS recursive server, and as such will have to perform >> all DNS >> resolution over IPv6. I want to know whether the DNS server can >> resolve all >> IPv4 nodes over IPv6 successfully. And how? Is it necessary that >> the type A >> DNS query packet travels through AFTR? Is there any requirement >> for the DNS >> server in the ISP core network? >> >> Best Regards, >> >> ------------------------------------ >> Zhenqiang Li >> 13911635816 >> Department >> of Network Technology >> China Mobile Research Institute >> 2010-05-26 >> >> _______________________________________________ >> Softwires mailing list >> >> [email protected] >> >> https://www.ietf.org/mailman/listinfo/softwires > ______________________________ >> _________________ > Softwires mailing >> list > [email protected] > https://www.ietf.org/mailman/listinfo/softwires > _______________________________________________ > Softwires mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/softwires _______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
