Naming and Service Discovery (draft-troan-homenet-naming-and-sd) IETF 85, Nov 2012 Authors: Ole Trøan(Cisco) Shwetha Bhandari (Cisco) Stephen Orr(Cisco)

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Naming and Service Discovery (draft-troan-homenet-naming-and-sd) IETF 85, Nov 2012 Authors: Ole Trøan(Cisco) Shwetha Bhandari (Cisco) Stephen Orr(Cisco)

Problems Discovery of Recursive DNS resolvers Internal naming External naming Read: ides-85-mdnsext-1.pdf ides-85-mdnsext-1.pdf

DNS recursive resolver discovery Part of “other configuration information” distribution. Flooding in the homenet control plane. Just like prefix assignment -or- Homenet routers acts as hosts and do ND/DHCP to glean information, that is then re-advertised on downstream interfaces.

External naming Requires configuration –Domain name (might not be the local one) Client updates DNS directly or network does it on the clients behalf Authoritative name server –External, or on one or more home routers Reverse lookups? –Delegated to the DHCPv6 PD RR? (draft-lemon-dhc-dns-pd)draft-lemon-dhc-dns-pd

Internal naming - Solution space mDNS domains (.local) zones glued together with unicast DNS-SD a)Central DNS server b)DNS servers on every home router with distributed repository The home is one mDNS domain (mDNS domains could be extended:) a)xmDNS (site-local multicast) b)mDNS proxies c)mDNS proxies with distributed repository / flooding

mDNS Service Announcement (Approach 1) Service Query element. Service provider e.g. foo service Service provider e.g. foo service mDNS Proxy Home Network 2. Flood(mDNS over home net control) 1.Announcement mDNS link local/ site scope Flooding over Home net control plane 3. Flood(mDNS over home net control plane)

mDNS Service Query(Approach 1) Service Query element. Service provider e.g. foo service Service provider e.g. foo service mDNS Proxy Home Network 1.mDNS query foo service mDNS link local/ site scope 2. mDNS response from cache foo service mDNS link local/ site scope

Service Announcement (Approach 2) Service Query element. Service provider e.g. foo service Service provider e.g. foo service mDNS Proxy Home Network 1. Unicast DDNS update 2. Update DNS database co-residing DNS Server

Service Announcement (Approach 2) Service Query element. Service provider e.g. foo service Service provider e.g. foo service mDNS Proxy Home Network 2. Unicast DDNS update 1.Announcement mDNS link local/ site scope 3. Update DNS database co-residing DNS Server

Service Query (Approach 2) Service Query element. Service provider e.g. foo service Service provider e.g. foo service mDNS Proxy Home Network co-residing DNS Server 1. Unicast query/response foo service

Service Query (Approach 2) Service Query element. Service provider e.g. foo service Service provider e.g. foo service mDNS Proxy Home Network 1.mDNS query foo service mDNS link local/ site scope 3. mDNS response from cache foo service mDNS link local/ site scope co-residing DNS Server 3. Unicast query/response foo service

Considerations: Central DNS server: –Server election / failover / discovery Distributed repository –How to synchronize the databases? mDNS extensions –Need multicast routing –or flooding support –Need integration with unicast DNS anyway Encoding issues. UTF-8. Fix DNS?

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