[FS#677] dnsmasq-full does not respond to DNS queries on IPv6 link-local addresses

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Bernhard Schmidt (bernhardschmidt) 

Attached to Project - LEDE Project
Summary - dnsmasq-full does not respond to DNS queries on IPv6 link-local addresses
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - LEDE 17.01 on Buffalo WZR-HP-AG300NH, tested with both dnsmasq-full 2.76 from 17.01 and 2.77test4-1 from trunk

The link-local address of the router is advertised as DNS resolver in the IPv6 router advertisement. Queries to that address are received on the router, logged in dnsmasq, but an answer is never sent (verified with tcpdump).

Tue Apr  4 00:10:20 2017 daemon.info dnsmasq[29569]: 15 fe80::6600:6aff:fe6a:9cf4%br-lan/34427 query[A] www.heise.de from fe80::6600:6aff:fe6a:9cf4
Tue Apr  4 00:10:20 2017 daemon.info dnsmasq[29569]: 15 fe80::6600:6aff:fe6a:9cf4%br-lan/34427 cached www.heise.de is 193.99.144.85

A query to the global address of the very same router works just fine.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=677