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# Dynamic DNS

From ArchWiki

Summary
Updating Dynamic DNS

Dynamic DNS or DDNS is a method of updating, in real time, a DNS to point to a changing IP address on the Internet. This is used to provide a persistent domain name for a resource that may change location on the network.

## Router

Many routers have built in DDNS Services but can be limited in the services which they update. If the Router supports a the service, or you are willing to pay or donate for a service, you should do this, it is faster and more reliable. In that case, there is no need to use a softwareside solution.

## Software Dynamic DNS

### Afraid

FreeDNS.afraid.org is a free Service which is easy and uncomplicated to set up.

There are several options to enable automatic DDNS updating for this provider:

#### afraid-dyndns

The package afraid-dyndns-uv is available in the AUR.

#### ddclient

The package ddclient is available in the community repository. It includes systemd support. Unfortunately, it seems to generate broken update URLs for freedns: http://ddclient.tisnix.be/ticket/58

An example config file looks like this:

    daemon=600
    cache=/tmp/ddclient.cache
    syslog=yes

    use=web, web=checkip.dyndns.com/, web-skip='IP Address'

    ssl=yes

    ## Configuration variables applicable to the 'freedns' protocol are:
    #  protocol=freedns             ##
    #  server=fqdn.of.service       ## defaults to freedns.afraid.org
    #  login=service-login          ## login name and password registered with the service
    #  password=service-password    ##
    #  fully.qualified.host         ## the host registered with the service.
    #
    protocol=freedns,                                             \
    login=my-freedns.afraid.org-login,                            \
    password=my-freedns.afraid.org-password                       \
    myhost.afraid.org

To enable the systemd service:

    systemctl enable ddclient

#### cron

Another option is to:

- goto Dynamic DNS page on freedns.afraid.org
- add A record and select your prefered domain name
- copy link under Direct URL, it will be something like "http://freedns.afraid.org/dynamic/update.php?ZRRJZ...................bzo4Njc1M4DA"
- use crontab -e to enter new schedulled command:

    */10 * * * * curl -ks http://freedns.afraid.org/dynamic/update.php?ZRRJZ...................bzo4Njc1M4DA > /dev/null

#### Netctl

To add the record of your IP to freedns.afraid.org along with a network connection through the use with Netctl. You can append the following line to your netctl profile.

    ExecUpPost='curl -ks http://freedns.afraid.org/dynamic/update.php?ZRRJZ...................bzo4Njc1M4DA'

### DynDNS

DynDNS is another Dynamic DNS service.

DynDNS can be updated with ddclient or the dyndns package in the AUR.

### DNSdynamic

DNSdynamic "will always be absolutely free" and works with ddclient

Retrieved from "https://wiki.archlinux.org/index.php?title=Dynamic_DNS&oldid=276770"
Category:

- Domain Name System

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