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mdns: set authoritative bit for mDNS replies #21108
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PR #21108: Size comparison from 0e08265 to 563f15f Increases (23 builds for bl602, cc13x2_26x2, efr32, esp32, linux, p6)
Decreases (2 builds for cc13x2_26x2, telink)
Full report (43 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)
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According to RFC 6762 this bit must be set in multicast messages and is harmless in unicast messages. The PR also fixes the wrong truncated flag value.
PR #21108: Size comparison from 2557f51 to ef91d96 Increases (13 builds for bl602, cc13x2_26x2, efr32, esp32, linux, p6, telink)
Decreases (1 build for cc13x2_26x2)
Full report (32 builds for bl602, cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)
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According to RFC 6762 this bit must be set in multicast messages and is harmless in unicast messages. The PR also fixes the wrong truncated flag value.
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Problem
According to RFC 6762 the AA bit must be set in multicast messages. The minimal mDNS implementation does not follow the spec.
Change overview
Always set the AA flags in minimal mDNS. This bit is harmless and is also always set in avahi.
The PR also fixes the wrong truncated flag value.
Testing
Manually tested with wireshark sniffing.