This is about https://en.wikipedia.org/wiki/NetBIOS#Name_service, that allows
registering and looking up names on a LAN. Best case, it gives a very nice UX
for service discovery on the LAN (in this case: connecting to a local Gobby
server), which can be super cool for teams working from a single location.
Worst case, it leaks things like the hostname on the LAN.

We've never made any serious attempt at supporting zeroconf and
friends (although Tails Server might be a game changer), so for now let's
explicitly drop these packets. The only practical problem I can think of is that
it might cause is making discovery of some network printers harder. That's not
worth the risk of announcing our hostname, or worse, though.

Closes: #11944