Dynamic DNS ----------- VyOS is able to update a remote DNS record when an interface gets a new IP address. In order to do so, VyOS includes ddclient_, a perl script written for this exact purpose. ddclient_ uses two methods to update a DNS record. The first one will send updates directly to the DNS daemon, in compliance with RFC2136_. The second one involves a third party service, like DynDNS.com or any other similar website. This method uses HTTP requests to transmit the new IP address. You can configure both in VyOS. VyOS CLI and RFC2136 ^^^^^^^^^^^^^^^^^^^^ First, create an RFC2136_ config node : .. code-block:: sh edit service dns dynamic interface eth0 rfc2136 <confignodename> Present your RNDC key to ddclient : .. code-block:: sh set key /config/dyndns/mydnsserver.rndc.key Set the DNS server IP/FQDN : .. code-block:: sh set server dns.mydomain.com Set the NS zone to be updated : .. code-block:: sh set zone mydomain.com Set the records to be updated : .. code-block:: sh set record dyn set record dyn2 You can optionally set a TTL (note : default value is 600 seconds) : .. code-block:: sh set ttl 600 This will generate the following ddclient config blocks: .. code-block:: sh server=dns.mydomain.com protocol=nsupdate password=/config/dyndns/mydnsserver.rndc.key ttl=600 zone=mydomain.com dyn server=dns.mydomain.com protocol=nsupdate password=/config/dyndns/mydnsserver.rndc.key ttl=600 zone=mydomain.com dyn2 You can also keep a different dns zone updated. Just create a new config node: .. code-block:: sh edit service dns dynamic interface eth0 rfc2136 <confignode2> VyOS CLI and HTTP dynamic DNS services ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ VyOS is also able to use any service relying on protocols supported by ddclient. To use such a service, you must define a login, a password, one or multiple hostnames, a protocol and a server. .. code-block:: sh edit service dns dynamic interface eth0 service HeNet set login my-login # set password my-password set host-name my-tunnel-id set protocol dyndns2 set server ipv4.tunnelbroker.net VyOS is also shipped with a list of known services. You don't need to set the protocol and server value as VyOS has defaults provided for those. These are the services VyOS knows about: * afraid * changeip * dnspark * dslreports * dyndns * easydns * namecheap * noip * zoneedit To use DynDNS for example: .. code-block:: sh edit service dns dynamic interface eth0 service dyndns set login my-login set password my-password set host-name my-dyndns-hostname It's possible to use multiple services : .. code-block:: sh edit service dns dynamic interface eth0 service dyndns set login my-login set password my-password set host-name my-dyndns-hostname edit service dns dynamic interface eth0 service HeNet set login my-login set password my-password set host-name my-tunnel-id set protocol dyndns2 set server ipv4.tunnelbroker.net ddclient behind NAT ^^^^^^^^^^^^^^^^^^^ By default, ddclient will update a dynamic dns record using the IP address directly attached to the interface. If your VyOS instance is behind NAT, your record will be updated to point to your internal IP. ddclient_ has another way to determine the WAN IP address. This is controlled by these two options: .. code-block:: sh set service dns dynamic interface eth0 use-web url set service dns dynamic interface eth0 use-web skip ddclient_ will load the webpage at `[url]` and will try to extract an IP address for the response. ddclient_ will skip any address located before the string set in `[skip]`. .. include:: references.rst