DDNS bug in DD-WRT when using the pre-set DynDNS settings

Technorati Tags: ,,


DD-WRT provides a set of predefined configurations for the most common DDNS services. This makes updating easy.  After choosing from one of the predefined DDNS services, you just need to provide the "User Name" and the "Password" for the account of your DDNS service. In the "Host Name" field, you have to enter the fully qualified name of you dynamic domain (e.g. myhostname.example.org). 

Dynamic DNS is a system for allowing an Internet domain name to be assigned to a varying IP address. This makes it possible for other sites on the Internet to establish connections to the machine without needing to track the IP address themselves. A common use is for running server software on a computer that has a dynamic IP address (e.g., a dialup connection where a new address is assigned at each connection, or a cable or DSL service where the address is changed by the internet service provider occasionally).


The DDNS issue is not new to v24 and clearly it is not fixed in SP1. It starts from v23sp2 when "inadyn" is first used for resolving the WAN IP for DDNS reporting. Prior to that, DD-WRT is using ez-ipupdate but the project has been inactive and not updated to take advantage of the recent developments in DDNS.

Here are some good reasons for switching to inadyn:

  • inadyn supports lot more DDNS providers. It could be possible to let user choose protocol and enter custom server address via web interface so virtually all DDNS providers could be supported.
  • inadyn can update multiple accounts, ez-ipupdate does not.
  • ez-ipupdate is dead since March 2002, inadyn is still actively being developed.
  • ez-ipudate inability to fetch IP from web site (really annoying)

As of v23, using DDNS in DD-WRT will not allow updates to the DynDNS server using the pre-set DynDNS settings. The problem is due to the use of port 80 to checkip.dyndns.org for your WAN IP and it will report IP address of the transparent proxy of your ISP instead of your real WAN IP. In fact, checkip.dyndns.org provided another port (port 8245) and the IP address reported will be correct.

I did not experienced this issue even after upgrading to v24-SP1 since the WAN IP assigned to my router did not changed.

The workaround is to use the Custom DNS. Below is the format, you only need to provide your username, password and hostname, the rest you can just copy and paste in the box.


DDNS Service : Custom
DYNDNS Server : members.dyndns.org
User name : ‘Your DynDNS username’
Password : ‘Your DynDNS password’
Hostname : ‘Your DynDNS hostname’
URL :  /nic/update?
Additional DDNS Options : –dyndns_system dyndns@dyndns.org –ip_server_name checkip.dyndns.org:8245 /

**If your using static DNS, replace dyndns@dyndns.org with statdns@dyndns.org 



Here’s my sample setting:





  1. Pingback: villas with private pool in goa

  2. Pingback: delegance homes

  3. Pingback: werbefachmann studium

  4. Pingback: schweiz arbeiten und wohnen

  5. Pingback: Leonard Pozner

  6. Pingback: wohnen in der schweiz arbeiten in deutschland

  7. Pingback: Leonard Pozner

  8. Pingback: Zonnescreens

  9. Pingback: Airco

  10. Pingback: Airconditioning Limburg

  11. Pingback: Airco Antwerpen

  12. Pingback: Erotische massage

  13. Pingback: Erotische massage Limburg

  14. Pingback: chat senza registrazione

  15. Allen

    It’s an amazing post in favor of all the online viewers; they will get advantage from
    it I am sure.

  16. Pingback: le mgliori chat

  17. Pingback: Gezandstraald glas

  18. Pingback: videochat libera

  19. Pingback: flower delivery

  20. Pingback: Tomato Plants Direct the mail order tomato specialists

  21. Pingback: videochat

  22. Pingback: chat libera

  23. Pingback: chat gratis

  24. Pingback: More Information

  25. Pingback: Click Here

  26. Pingback: Read More

  27. Pingback: Flightera - Flight statistics

  28. Pingback: Flightera - Plane Database

  29. Pingback: Flightera - Plane Database

  30. Pingback: Read More

  31. Pingback: Click Here

  32. Pingback: Flightera - Airplane information and travel updates

  33. Pingback: residential dumpster

  34. Pingback: garbage bin

  35. Pingback: dumpster trash

  36. Pingback: give your car to charity

  37. Pingback: construction trash containers

  38. Pingback: car donation nj

  39. Pingback: dumpster rental atlanta

  40. Pingback: Home

  41. Pingback: roll off container

  42. Pingback: dumpster rental orlando

  43. Pingback: how to tighten loose skin after pregnancy

  44. Pingback: skin tightener

  45. Pingback: Services

  46. Pingback: trash collection

  47. Pingback: pricing

  48. Pingback: exercises for tightening underarm skin

  49. Pingback: laser skin tightening before and after

  50. Pingback: garbage dumpster rental

Leave a Comment

Your email address will not be published. Required fields are marked *