thanks Med, that may be a good idea, we can have a try. and the IPv4-mapped IPv6 addressing plan can be used for the dns servers in ISP networks.
On Fri, May 28, 2010 at 1:36 AM, <mohamed.boucad...@orange-ftgroup.com>wrote: > Dear Jacni, > > Please see inline. > > Cheers, > Med > ________________________________________ > De : softwires-boun...@ietf.org [softwires-boun...@ietf.org] de la part de > Jacni Qin [jac...@gmail.com] > Date d'envoi : jeudi 27 mai 2010 17:54 > À : Lee, Yiu > Cc : Durand, Alain; softwires@ietf.org > Objet : Re: [Softwires] DNS question about DS-lite > > On Thu, May 27, 2010 at 1:00 AM, Lee, Yiu <yiu_...@cable.comcast.com > <mailto:yiu_...@cable.comcast.com>> wrote: > > If the B4 is in the host, the B4 implementation should be able to proxy the > v4 DNS request over v6. Or B4 tunnels the DNS message and sends to a v4 DNS > server (less desirable). > > -- while as mentioned in the draft, currently there is no option defined > for passing the v4 DNS server address to hosts. > > > Med: If you really want to provision an IPv4 address of the DNS server, you > can inspire from what we proposed for PCP: > http://tools.ietf.org/html/draft-bpw-softwire-pcp-dhcp-01#section-3.1 and > convey an IP4-mapped IPv6 address (representing the IPv4 address of your DNS > server) in the DHCPv6 option. BTW, it is recommended to send DNS queries > over IPv6 to avoid crossing the AFTR for various reasons (avoid nating DNS > messages, better ports usage in the AFTR since DNS traffic represents an > important amount of messages issued by various applications, incremental > migration of network services to IPv6: DNS and NTP for instance). > ********************************* > This message and any attachments (the "message") are confidential and > intended solely for the addressees. > Any unauthorised use or dissemination is prohibited. > Messages are susceptible to alteration. > France Telecom Group shall not be liable for the message if altered, > changed or falsified. > If you are not the intended addressee of this message, please cancel it > immediately and inform the sender. > ******************************** > >
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