Connect to Linux by name rather than IP

Zero-configuration LAN discovery protocols, in order of preference:

• mDNS
  • Used primarily by Apple products and some Linux programs, but also available for Windows and possibly other platforms; uses IP multicast.
  • Provides both name lookup and service discovery.
  • Host names are always in the form name.local.
  • Software:
    • natively supported on Windows 10.1709 and later (must be enabled via Registry);
    • Bonjour on older Windows;
    • Avahi with nss_mdns on Linux;
    • natively supported on OS X and iOS (and, supposedly, Android).
• LLMNR
  • Used for name resolution by Windows Vista and above, as a modern alternative to NetBIOS name services.
  • Very similar to mDNS, but has fewer features – in particular, lacks service discovery (Windows uses the WS-Discovery protocol for that).
  • Uses bare hostnames (like NBNS, but unlike mDNS).
  • Software:
    • Natively supported by Windows Vista and later;
    • systemd-resolved with nss_resolve (part of systemd 216) on Linux. .
• NetBIOS name services
  • Part of the old NetBIOS network protocol suite used by Windows, OS/2, MS-DOS... Still in use. Not an excuse to start using it on new networks.
  • Provides name resolution and (to some extent) service discovery – aka "Network Neighbourhood" or "My Network Places" in Windows.
  • Uses IPv4 broadcasts (somewhat chatty), and has its own complex and stupid "browser election" protocol to reduce the chattiness. No IPv6 support at all.
  • Software:
    • Natively supported on Windows and OS/2;
    • nmbd with nss_wins (part of Samba) on Linux and BSD's;
    • Apparently OS X supports it natively as well?

Methods that are often pre-configured for you:

• DNS using a local (internal) domain name
  • Home gateways tend to have this built-in, as part of the local DNS cache. Often it's just regular dnsmasq, which you could run manually if you're setting up a Linux/BSD-based gateway.
  • They take the hostname from your DHCP request, register it within dnsmasq under a domain like home, and offer themselves as the main DNS server (act as DNS cache).
  • Works by default with most operating systems, but only with DHCP (the gateway doesn't know hostnames of static-IP hosts), and generally tends to be rather flaky in my experience.
  • Software:
    • A regular DHCP client on the hosts. Must send the hostname option.
    • dnsmasq on the gateway. (Larger setups could use dhcpd + named.)

Methods involving manual configuration:

• DNS using your own domain name
  • Works everywhere. (Won't help you to actually connect over the Internet, though.)
  • Dynamic DNS possible if you use DHCP and control a DNS server; otherwise all data is static.
  • Need to own a domain name (which will cost a few bucks).
• free DNS subdomains
  • Still DNS, just free (or much cheaper than a domain), but also quite limited. Services like FreeDNS and Dyn offer registration of individual subdomains under a domain they control (for example myhost.dyndns.com).
    • Way too often, the subdomain has already been picked by someone else...
  • Dynamic DNS updates are often allowed (DynDNS-style).
• /etc/hosts
  • A text file listing IP address – hostname pairs, which must be manually configured on each client machine.
  • (%SystemRoot%\system32\drivers\etc\hosts on Windows)
• SSH configuration
  • The "Hostname" field in PuTTY, or ~/.ssh/config on OpenSSH.
  • Must be manually configured.
• PostIt notes all over your desk
  • Very cheap. No naming policy. Infinite data types.
  • Rather unreliable. Must be manually distributed. No TTL, which often results in stale information being cached for months until someone notices. Query algorithms are inefficient. Responses to queries tend to get lost easily, sometimes leaving just a glue record on your monitor. (Three months later, you might find them buffered behind your desk.)

Two options.

• All services:

Put an entry for it in /etc/hosts. Don't touch existing lines, add a new one.

• ssh only:

Add a Host stanza to ~/.ssh/config with the name you want to use, then add desired options below that. See man 5 ssh_config for more details.

Host myserver
    Hostname 192.168.123.234
    Protocol 2

If you want to access the Linux box from an arbitrary computer, you would need a domain name. Use a dynamic DNS service to point a domain name to your Linux computer (or the router it is connected to). Once you set this up, it will give yo the additional benefit of not having to worry about the IP of your Linux computer ever changing.