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ddclient is a Perl client used to update dynamic DNS entries for accounts on many dynamic DNS services.

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Dynamic DNS services currently supported include:

DynDNS.com  - See http://www.dyndns.com for details on obtaining a free account.
Zoneedit    - See http://www.zoneedit.com for details.
EasyDNS     - See http://www.easydns.com for details.
NameCheap   - See http://www.namecheap.com for details
DslReports  - See http://www.dslreports.com for details
Sitelutions - See http://www.sitelutions.com for details
Loopia      - See http://www.loopia.se for details
Noip        - See http://www.noip.com/ for details
Freedns     - See http://freedns.afraid.org/ for details
ChangeIP    - See http://www.changeip.com/ for details
nsupdate    - See nsupdate(1) and ddns-confgen(8) for details
CloudFlare  - See https://www.cloudflare.com/ for details
Google      - See http://www.google.com/domains for details
Duckdns     - See https://duckdns.org/ for details
Freemyip    - See https://freemyip.com for details
woima.fi    - See https://woima.fi/ for details
Yandex      - See https://domain.yandex.com/ for details
DNS Made Easy - See https://dnsmadeeasy.com/ for details
DonDominio  - See https://www.dondominio.com for details
NearlyFreeSpeech.net - See https://www.nearlyfreespeech.net/services/dns for details
OVH         - See https://www.ovh.com for details
ClouDNS     - See https://www.cloudns.net
dinahosting - See https://dinahosting.com
Gandi       - See https://gandi.net

DDclient now supports many of cable/dsl broadband routers.

Comments, suggestions and requests: use the issues on https://github.com/ddclient/ddclient/issues/new

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

• An account from a supported dynamic DNS service provider
• Perl v5.10.1 or later
  • IO::Socket::SSL perl library for ssl-support
  • JSON::PP perl library for JSON support
  • IO::Socket:INET6 perl library for ipv6-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/ddclient/ddclient/releases

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

   tar xvfa ddclient-3.9.1.tar.gz
   cd ddclient-3.9.1

   (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

cp sample-etc_rc.d_init.d_ddclient /etc/rc.d/init.d/ddclient

enable automatic startup when booting. also check your distribution

/sbin/chkconfig --add ddclient

start the first time by hand

/etc/rc.d/init.d/ddclient start

cp sample-etc_rc.d_init.d_ddclient.alpine /etc/init.d/ddclient

enable automatic startup when booting

rc-update add ddclient

make sure you have perl installed

apk add perl

start the first time by hand

rc-service ddclient start

cp sample-etc_rc.d_init.d_ddclient.ubuntu /etc/init.d/ddclient

enable automatic startup when booting

update-rc.d ddclient defaults

make sure you have perl and the required modules installed

apt-get install perl libdata-validate-ip-perl libio-socket-ssl-perl

if you plan to use cloudflare or feedns you need the perl json module

apt-get install libjson-pp-perl

for IPv6 you also need to instal the perl io-socker-inet6 module

apt install libio-socket-inet6-perl

start the first time by hand

service ddclient start

mkdir -p /usr/local/etc/rc.d
cp sample-etc_rc.d_ddclient.freebsd /usr/local/etc/rc.d/ddclient

enable automatic startup when booting

sysrc ddclient_enable=YES

make sure you have perl and the required modules installed

pkg install perl5 p5-Data-Validate-IP p5-IO-Socket-SSL

if you plan to use cloudflare or feedns you need the perl json module

pkg install p5-JSON-PP

start the service manually for the first time

service ddclient start

If you are not using daemon-mode, configure cron and dhcp or ppp as described below.

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.