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This page has been translated into Spanish
language by Maria Ramos from Webhostinghub.com/support/edu.
DDclient is a small but full featured client requiring only Perl and no additional modules.
It runs under most UNIX OSes and has been tested under GNU/Linux and FreeBSD.
Supported features include: operating as a daemon, manual and automatic updates,
static and dynamic updates, optimized updates for multiple addresses, MX, wildcards,
abuse avoidance, retrying failed updates, and sending update status to syslog and through e-mail.
The homepage of DDClient
Installation of DDClient is extremely easy. Download the new package and untar it.
tar zxvf ddclient.tar.gz
Now navigate to the newly created ddclient directory and copy the ddclient script to
That's all there is! There's no other installation required.
DDClient uses a configuration script that needs to be placed in /etc/ or in /etc/ddclient (depending on the kind of distribution you're using). After
the first run, you will notice that there's also a 'cache' file. This is
used to store temporary data.
During installation, an example config-file is created and it's fairly easy to use this as
cp ddclient /usr/sbin
Copy the file sample-etc_ddclient.conf to /etc/and give it a new name.
cp sample-etc_ddclient.conf /etc/ddclient.conf
Now edit the file ddclient.conf with your favorite editor.
Because I'm only using the services of
I can only speak for their configuration.
These are the settings that you need to adjust.
This gives you the ability to have a nice entry in your syslog-files.
By this, you specify that ddclient needs to look to the ppp0 interface.
For normal DSL or Cable connections this will be your external interface.
Use the DYNDNS2 protocol (default)
Update your account at dyndns.org or easydns.org
Use these as your default login and password for the service that
needs to be updated.
server=members.dyndns.org, protocol=dyndns2, mydomain.dyndns.org
Update 'mydomain.dyndns.org' at dyndns.org (don't forget the comma's).
You can add as many domains as you want. Just follow the same syntax
for every seperate domain. Off course, the same goes for easydns :
That's all for the config-file. To get the updating to work automatic when your ip changes,
you need to add the following line to /etc/ppp/ip-up.local/
/usr/sbin/ddclient -daemon=0 -syslog -use=if -if=$1 >/dev/null 2>&1
On the other hand, if you're using DHCP, you need to copy the file
sample-etc_dhcpc_dhcpcd-eth0.exe to /etc/dhcpc/.
To make it easier, I've included a sample config-file :
That's everything you need to get DDClient working with a dyndns-account on Red Hat.
daemon=300 # check every 300 seconds
syslog=yes # log update msgs to syslog
firstname.lastname@example.org # mail update msgs to root
pid=/var/run/ddclient.pid # record PID in file.