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Overview of Operation Multicast DNS (mDNS) Runs on each host in a local subnet Queries & answers are sent via link-local multicast to port 5353 Special TLD reserved for local names: “.local.” PTR records enumerate available service instances _sipuri._udp.local. PTR sip:bob@a.com._sipuri._udp.local. _sipuri._udp.local. PTR sip:joe@a.com._sipuri._udp.local. SRV & A records resolve a specific service instance sip:bob@a.com._sipuri._udp.local. SRV 0 0 5060 bobs-machine.local. bobs-machine.local. A 192.168.0.100 TXT records contain additional information sip:bob@a.com._sipuri._udp.local. TXT txtvers=1 name=Bob the Builder contact= |