Multicast DNS

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Revision as of 15:17, 11 July 2020 by Unknown user (talk) (Created page with "multicast DNS: stumbled upon this 7/11/20 after setting up iptables and logging dropped packets, and seeing 224.0.0.251 sending traffic on port 5353. the 5353 was a clue tha...")
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multicast DNS:

stumbled upon this 7/11/20 after setting up iptables and logging dropped packets, and seeing 224.0.0.251 sending traffic on port 5353.

the 5353 was a clue that it was related to DNS, but it turns out this is a whole rabbit hole about some kind of local loopback DNS.

RFC 6762: https://tools.ietf.org/html/rfc6762

Here it is in plain English: multicast DNS and service discovery are common in modern tech products (home and small office environment - printers, routers, etc.). Part of zeroconf, a suite of technologies to help network devices discover each other in absence of authoritative DNS server.

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