kwohlfahrt/dyndns

Non-polling dynamic DNS utility

dyndns

Non-polling dynamic DNS utility for linux.

dyndns is a utility for linux that will listen for IP address changes on an interface, and display them or use them to fetch a website.

Requirements

The only requirement is libcurl.

Usage

dyndns [-v] [-46] [--allow-private] <interface> [URL]

If called with one option, dyndns will print new IP addresses to stdout.

If called with two it will GET the address specified by URL, substituting the pattern <ipaddr> for the new IP address. The pattern may occur zero or more times.

If neither -4 nor -6 is specified, it will listen for both IPv4 and IPv6 addresses, otherwise it will react only to the specified one. Both may be explicitly specified.

If --allow-private is specified, it will also react to private IPv4 addresses (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and IPv6 Unique Local Addresses (fc00::/7), otherwise these will be ignored.

-v adds some additional verbosity, but doesn't really do much.

dyndns's Issues

multiple addresses ignored

If multiple addresses are present, only one is processed.

deprecated addresses used

Sometimes an interface is configured with an address that is marked as deprecated, this can be seen with ip addr. These are treated as a normal address, instead they should be (optionally) ignored.