ddclient is a Perl client used to update dynamic DNS entries for accounts on many dynamic DNS services. It uses curl for internet access.

This is a friendly fork/continuation of https://github.com/ddclient/ddclient

You might also want to consider using one of the following, if they support your dynamic DNS provider(s): https://github.com/troglobit/inadyn or https://github.com/lopsided98/dnsupdate.

Dynamic DNS services currently supported include:

• 1984.is
• ChangeIP
• CloudFlare
• ClouDNS
• dinahosting
• DonDominio
• DNS Made Easy
• DNSExit
• domenehsop
• DslReports
• Duck DNS
• DynDNS.com
• EasyDNS
• Enom
• Freedns
• Freemyip
• Gandi
• GoDaddy
• Google
• Infomaniak
• Loopia
• Mythic Beasts
• NameCheap
• NearlyFreeSpeech.net
• Njalla
• Noip
• nsupdate - see nsupdate(1) and ddns-confgen(8)
• OVH
• Porkbun
• regfish.de
• Sitelutions
• woima.fi
• Yandex
• Zoneedit

ddclient supports finding your IP address from many cable and DSL broadband routers.

Comments, suggestions and requests: please file an issue at https://github.com/rrthomas/ddclient/issues/new

The code was originally written by Paul Burry and is now hosted and maintained through github.com. Please check out https://ddclient.net

• An account from a supported dynamic DNS service provider
• Perl v5.10.1 or later
  • JSON::PP perl library for JSON support
• Linux, macOS, or any other Unix-ish system
• An implementation of make (such as GNU Make)
• If you are installing from a clone of the Git repository, you will also need GNU Autoconf and GNU Automake.

See https://github.com/rrthomas/ddclient/releases

1. Extract the distribution tarball (.tar.gz file) and cd into the directory:

   tar xvfa ddclient-3.XX.X.tar.gz
   cd ddclient-3.XX.X

   (If you are installing from a clone of the Git repository, you must run ./autogen before continuing to the next step.)

2. Run the following commands to build and install:

   ./configure \
       --prefix=/usr \
       --sysconfdir=/etc/ddclient \
       --localstatedir=/var
   make
   make VERBOSE=1 check
   sudo make install

3. Edit /etc/ddclient/ddclient.conf.

cp sample-etc_systemd.service /etc/systemd/system/ddclient.service

enable automatic startup when booting

systemctl enable ddclient.service

start the first time by hand

systemctl start ddclient.service

1. enable debugging and verbose messages: $ ddclient -daemon=0 -debug -verbose -noquiet

2. Do you need to specify a proxy? If so, just add a proxy=your.isp.proxy to the ddclient.conf file.

3. Define the IP address of your router with fw=xxx.xxx.xxx.xxx in /etc/ddclient/ddclient.conf and then try $ ddclient -daemon=0 -query to see if the router status web page can be understood.

4. Need support for another router/firewall? Define the router status page yourself with: fw=url-to-your-router's-status-page fw-skip=any-string-preceding-your-IP-address

   ddclient does something like this to provide builtin support for common routers. For example, the Linksys routers could have been added with:

fw=192.168.1.1/Status.htm
fw-skip=WAN.*?IP Address

OR Send me the output from: $ ddclient -geturl {fw-ip-status-url} [-login login [-password password]] and I'll add it to the next release!

ie. for my fw/router I used: $ ddclient -geturl 192.168.1.254/status.htm

5. Some broadband routers require the use of a password when ddclient accesses its status page to determine the router's WAN IP address. If this is the case for your router, add

fw-login=your-router-login
fw-password=your-router-password

to the beginning of your ddclient.conf file. Note that some routers use either 'root' or 'admin' as their login while some others accept anything.

If you are using a ppp connection, you can easily update your DynDNS entry with each connection, with:

## configure pppd to update DynDNS with each connection
cp sample-etc_ppp_ip-up.local /etc/ppp/ip-up.local

Alternatively, you may just configure ddclient to operate as a daemon and monitor your ppp interface.

If you have not configured ddclient to use daemon-mode, you'll need to configure cron to force an update once a month so that the dns entry will not become stale.

## configure cron to force an update twice a month
cp sample-etc_cron.d_ddclient /etc/cron.d/ddclient
vi /etc/cron.d/ddclient

If you are using dhcpcd-1.3.17 or thereabouts, you can easily update your DynDNS entry automatically every time your lease is obtained or renewed by creating an executable file named: /etc/dhcpc/dhcpcd-{your-interface}.exe ie.: cp sample-etc_dhcpc_dhcpcd-eth0.exe /etc/dhcpc/dhcpcd-{your-interface}.exe

In my case, it is named dhcpcd-eth0.exe and contains the lines:

#!/bin/sh
PATH=/usr/bin:/root/bin:${PATH}
logger -t dhcpcd IP address changed to $1
ddclient -proxy fasthttp.sympatico.ca -wildcard -ip $1 | logger -t ddclient
exit 0

Other DHCP clients may have another method of calling out to programs for updating DNS entries.

Alternatively, you may just configure ddclient to operate as a daemon and monitor your ethernet interface.

If you are using the ISC DHCP client (dhclient), you can update your DynDNS entry automatically every time your lease is obtained or renewed by creating an executable file named: /etc/dhclient-exit-hooks ie.: cp sample-etc_dhclient-exit-hooks /etc/dhclient-exit-hooks

Edit /etc/dhclient-exit-hooks to change any options required.

Alternatively, you may just configure ddclient to operate as a daemon and monitor your ethernet interface.