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[lwip-devel] [patch #9429] mdns: added support for searching services

From: Erik Ekman
Subject: [lwip-devel] [patch #9429] mdns: added support for searching services
Date: Mon, 8 Jan 2018 16:02:43 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.62 Safari/537.36

Follow-up Comment #3, patch #9429 (project lwip):

The DNS module already supports sending queries for the .local. domain to the
MDNS multicast address. What does this add?

It sends queries with source port 5353 even though it is not a full MDNS
capable querier. This is not allowed by the RFC:
(rfc6762 section 5.1)
.... these queries MUST NOT be sent using UDP source port 5353, since using
UDP source port 5353 signals the presence of a fully compliant Multicast DNS
querier, as described below.


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