IPv6 DNS issues draft-ietf-dnsop-ipv6-dns-issues-00.txt

Draft objective Accepted as wg document last meeting Document IPv6 related issues Proposed operational recommendations Candidate for BCP or Informational

Name space continuity Every recursive DNS server SHOULD be either IPv4-only or dual stack. Every single DNS zone SHOULD be served by at least one IPv4 reachable DNS server This recommendation could be revisited if/when translation techniques between IPv4 & IPv6 are deployed.

Local scope addresses Link local addresses SHOULD NOT be published in the DNS. Site local addresses SHOULD NOT be published in the public DNS. They MAY be published in a site view of the DNS if two-face DNS is deployed. Question: –Can we recommend to put SL in the.local.arpa (or.site.arpa) zone?

SL & Reverse path DNS Site local addresses SHOULD NOT be populated in the public reverse tree. If two-face DNS is deployed, site local addresses MAY be populated in the local view of reverse tree.

RFC3041 & Reverse path DNS RFC3041 (privacy extension) addresses SHOULD NOT be published in reverse path DNS

6to4 & Reverse path DNS (unresolved) draft-moore-6to4-dns-03.txt draft-ymbk-…. ? Rfc1101 trick (see later)

“pre-populating” Reverse path DNS (unresolved) Widespread current practice for ISP serving home customers 2 reasons: –letting the customer manage the tree –Don’t want to answer calls when something goes wrong because of the absence of a PTR The size of v6 address space does not allow this practice any more

Pre-populating: solutions Wildcard entry –Several people are uneasy with wildcard in general DNS record synthesis (reverse & forward tree) –may affect DNSsec RFC1101 trick (not in the draft)

RFC1101 “trick” (last resort when no PTR has been found) Network admin configures PTR & AAAA for network name as in RFC1101 getaddrinfo(): –If PTR exist, returns it –If not, zero the interface ID and ask a PTR –Return string: $InterfaceID “+” $NetName getnameinfo(): –If AAAA exist, returns it –If not and syntax $InterfaceID “+” $NetName, get AAAA for NetName and paste $IntefaceID

Possible extensions Repeat trick at /48 boundary: –$InterfaceID “+” $SubnetID “+” $PrefixName Use it for 6to4 –$InterfaceID “+” $SubnetID “+6to4+” PTR(IPv4 underlying address)