Don't try to use link-local addresses outside local network
If we have gathered a host IP-address that is link-local we should never try to use it for anything else than trying to match it with another link-local address. Some routers seem to have problems with traffic from link-local addresses destined at external IP-addresses. By definition link-local addresses should stay local so there's no reason to access STUN/TURN from it or try to form a candidate with another address that is not link-local.
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