I just did a "pacman -Syu". It upgraded a number of packages including nss-mdns.
When it upgraded nss-mdns, ir displayed the following message:
"To enable IPv4 multicast DNS lookups, append mdns4 to the hosts line in /etc/nsswitch.conf. Use mdns6 for IPv6 or mdns for both"
What does that mean? What are the advantages of multicast DNS lookups?