Hi, Unless there is the unholy(?) split-DNS deployment.
In split-DNS situation some of the information returned by DNS may differ between different administrative domains, and it is thus risky to retain DNS cache (of stub resolver - if that makes difference?) during host movement from one network to another, or if running in multi-homed scenario where different network interfaces are towards different administrative domains (which provide some private or conflicting information). This week in MIF WG meeting I talked about this in relation to draft-savolainen-mif-dns-server-selection, http://www3.ietf.org/proceedings/75/slides/mif-4.ppt It would be nice to receive feedback for the problem from dnsop as well (has been in my plans, but never made it this far before). Best regards, Teemu >-----Original Message----- >From: dnsop-boun...@ietf.org [mailto:dnsop-boun...@ietf.org] >On Behalf Of ext Olafur Gudmundsson >Sent: 27 July, 2009 16:38 >To: venkatesh.bs; dnsop@ietf.org >Subject: Re: [DNSOP] query regarding DNS Cache in resolver. > >At 00:56 27/07/2009, venkatesh.bs wrote: >>Hi all, >> I have one query regarding DNS cache maintaince in dns >resolver, >>Whether DNS Cache should be based on per server address or based on >>FQDN only. > >DNS caches MUST cache by the holy DNS Trinity: > Query Name, Query Type, Query Class DNSSEC aware >caches the cache should remember the setting of the DO bit in >the answer. >There is no need to remember where the answer came from. > >If a new query matches what is in the cache then it can be reused. > > Olafur > >>1. Query1: Domain name: "google.com" DNS IP: DNS_SERVER_1 - >result will >>be stored in DNS Cache Meanwhile,DNS Server IP got changed. >>2. Query2: Domain name: "google.com" DNS IP: DNS_SERVER_2 - Should we >>have to query to DNS Server 2? or Should we have to get it >from DNS Cache? >> >> >>Thanks in Advance. >> >>Best Regards, >>Venkatesh. >>_______________________________________________ >>DNSOP mailing list >>DNSOP@ietf.org >>https://www.ietf.org/mailman/listinfo/dnsop > >_______________________________________________ >DNSOP mailing list >DNSOP@ietf.org >https://www.ietf.org/mailman/listinfo/dnsop > _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
