DDNS not working

Unanswered Question
Aug 7th, 2007
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My wan link is a ADSL line with a dynamic ip. I am trying to set up from the router my dns using a dynamic dns. In this case I use dyndns.org.

This is my configuration:

ip ddns update method myddns


add <A HREF="javascript:newWin('http://XXXX:[email protected]/nic/update?system=dyndns&hostname')">http://XXXX:[email protected]/nic/update?system=dyndns&hostname</A>=<h>&myip=<a>

interval maximum 0 0 2 0

interface Dialer0

ip ddns update hostname XXXX.dyndns.org

ip ddns update myddns host members.dyndns.org

ip address negotiated

Aparently should be working like that.

This is the output of show ip ddns update

XXXX#show ip ddns update

Dynamic DNS Update on Dialer0:

Update Method Name Update Destination

myddns host: members.dyndns.org

But it is not working. Even with the debug ip ddns update nothing happens, I can not see any packet or communication between my router and dns server.

Can anyone help me?

Thanks in advance,


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RF_IESFAFE Tue, 08/07/2007 - 15:14
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Hi Jorge,

I believe you have this line wrong:

"ip ddns update myddns host members.dyndns.org"

Try instead:

"ip ddns update myddns"

The 'host xxxxxx' part is not for HTTP ddns methods.

Also be carefull with this line:

"interval maximum 0 0 2 0"

It will configure the router to perform the update every 2 minutes, and that will block your dyndns.org service due to abuse.



jorolas Tue, 08/07/2007 - 23:24
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Hi Rui,

I had already tried without the host XXXX as well but didnt work either.

Regarding the 0 0 2 0, I use this values just to troubleshoot it, as if it is sending updates every 2 minutes, I could see something in the debug output, but nothing happens.

Does not even try to send the update!!!

Thanks anyway,



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