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DynDns is one of the free(as in no cost) Dynamic DNS provider.A Dynamic Dns is a service that permit you to have your own address name (such as so you can offer services such as SSH or web server( while having a Dynamic ip...

The setup

I tried:

  • updatedd: updatedd-wrapper doesn't have a rc.d mode so you need to create it yourseld
  • ipcheck : doesn't work for me because it doesn't find my ip on my userspace pppoe interface(tun0)
  • ddclient: comes with a rc.d script...that's the good one

It would be nice if the ppp daemon could call script when the ip changes...but as i don't know how to do it we will use the daemon mode of ddclient.

run this command in order to install ddclient:

cd /usr/ports/dns/ddclient && make config && make install

then you need to configure it: here's my config file:

daemon=1				# check every 300 seconds
syslog=yes				# log update msgs to syslog
mail=root				# mail all msgs to root
mail-failure=root			# mail failed update msgs to root
pid=/var/run/		# record PID in file.
ssl=yes					# use ssl-support.  Works with ssl-library
login=GNUtoo					# default login
password=mypassword				# default password				# default MX
#backupmx=yes|no				# host is primary MX?
#wildcard=yes|no				# add wildcard CNAME?
 custom=yes,                            \,             \
 protocol=dyndns2                       \

you can do your own copying the sample file to /usr/local/etc/:

cp /usr/local/etc/ddclient.conf.sample /usr/local/etc/ddclient.conf

and then editing it...

then we will need to execute the script when the internet comes up: add this to /etc/rc.conf:


then if you get insternet via ppp,pppoe,pppoa: create the ppp.linkup file with the following content:

 !bg /usr/local/etc/rc.d/ddclient restart

change alice to match the provider you defined in /etc/ppp.conf

BE have to wait some time between the time the internet comes up and ddclient is restarted

List of Dynamic DNS Providers

The following is a list of Dynamic DNS solution providers that support open source operating systems:

Many of these services offer free dynamic-IP name resolution using pre-defined domain names as well as paid-for services allowing the use of personal (self registered) domain names. For example No-IP has a domain name of '' that can host sub-domains for free such as ''. The paid-for service allows the use of your own domain name such as ''.

See Also

The open source firewall project called SmoothWall has in-built support for the leading Dynamic DNS providers.

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