What is purpose of new DNS proxy address?

[Petr Menšík <pemensik@xxxxxxxxxx>]

Hi!

I would like to know what is purpose of DNS proxy listener at 127.0.0.54 
address. What were primary motivation for its creation?

Would it be possible having just (cached) DNS protocol on default stub 
127.0.0.53? LLMNR could be handled by nss-resolve plugin, which provides 
everything required. It would make it similar to Windows implementation 
and avoid problems with DNS on default listener. Why is a new listener 
created instead of fixing the original one? Why should there be a 
different server address? Is already existing stub offered to the host 
unfixable?

Regards,
Petr