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Line 62: mDNS uses packets similar to [[Domain Name System#DNS message format\|unicast DNS]] to resolve hostnames except they are sent over a multicast link. Each host listens on the mDNS port, 5353, transmitted to a well-known multicast address and resolves requests for the [[resource record\|DNS record]] of its ''.local'' hostname (e.g. the [[List of DNS record types#A\|A]], [[List of DNS record types#AAAA\|AAAA]], [[CNAME record\|CNAME]]) to its IP address. When an mDNS client needs to resolve a local hostname to an IP address, it sends a DNS request for that name to the well-known multicast address; the computer with the corresponding A/AAAA record replies with its IP address. The mDNS multicast address is {{IPaddr\|224.0.0.251}} for IPv4 and {{IPaddr\|ff02::fb}} for IPv6 link-local addressing. DNS Service Discovery (aka [[DNS-SD)]] requests can also be sent using mDNS to yield zero-configuration DNS-SD.{{Ref RFC\|6763}} This uses DNS [[PTR record\|PTR]], SRV, [[TXT record\|TXT]] records to advertise instances of service types, ___domain names for those instances, and optional configuration parameters for connecting to those instances. But SRV records can now resolve to ''.local'' ___domain names, which mDNS can resolve to local IP addresses. ====Support====

Zero-configuration networking: Difference between revisions