Avahi

Avahi is a linux mdns implementation.
It allows you to resolve hostnames to ip addresses over your local network.

Documentation

arch wiki	https://wiki.archlinux.org/index.php/Avahi
wikipedia	https://en.wikipedia.org/wiki/Avahi_(software)

Locations

/etc/nsswitch.conf

Install

sudo pacman -S avahi
sudo pacman -S nss-mdns
sudo systemctl enable avahi-daemon.service
# CLIENT && HOST: allow in proto UDP dport 5353
# HOST: allow in proto ICMPV6

Configuration

{hostname}.local resolution

On both the host/client

# /etc/nsswitch.conf

# add 'mdns_minimal [NOTFOUND=return]' before 'resolve' and 'dns'
hosts: files mymachines myhostname mdns_minimal [NOTFOUND=return] resolve [!UNAVAIL=return] dns

You'll also need to configure your firewall so

• (host/client) UDP/5353 in is accepted
• (client) ICMPV6 in is accepted

# /etc/nftables.conf
# (nftables example)

table inet filter {
    chain input {
        # ...
        ip protocol icmp accept;
        ip6 nexthdr icmpv6 accept;
    }
}