Cisco 2801 and DDNS, how?

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Oct 1st, 2007
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after several searches, i still cannot a solution to implement DDNS on the cisco router ios 12.4. it just does work with the hostname

anyone managed to get it to work willing to share his experience and ddns config


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rsabapathee Tue, 10/02/2007 - 07:08
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thanks. I got it to work partially through the following config. Note I replaced with

ip ddns update method dyndns


add http://test:test@/nic/update?system=dyndns&hostname=&myip=

interval max 28 0 0 0

interface ethernet1

ip ddns update hostname

ip ddns update dyndns host

ip addr

The problem I now that is that the DDNS is updating the hostname with the internal ip address (i.e

How to ensure that the WAN ip is matched to the hostname?

Note The Cisco 2801 is connected to the ADSL router through a Cisco Catalyst L2 switch.


rsabapathee Tue, 10/02/2007 - 08:51
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what if i create a subinterface with no ip address??

anyone tried that?

paolo bevilacqua Wed, 10/03/2007 - 11:08
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With which interface do you connect to ADSL? Your DDNS configuration must be put under that interface.

rsabapathee Tue, 10/02/2007 - 21:42
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I created an interface this morning with no ip address but it does update the dydns record with the WAN ip address.

How to ensure that the WAN IP address is updated?



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