Dynamic DNS Updater - Revision history

Casey at 20:44, 13 June 2013

2013-06-13T20:44:50Z

Casey at 20:19, 13 June 2013

2013-06-13T20:19:29Z

Casey at 17:40, 13 June 2013

2013-06-13T17:40:52Z

Casey at 17:37, 13 June 2013

2013-06-13T17:37:05Z

Casey at 17:29, 13 June 2013

2013-06-13T17:29:48Z

Casey: Created page with "==The Problem== The Cisco implementation for Dynamic DNS updating is broken in two ways that I've found: * Firstly, there's Cisco Bug ID CSCtx50249, which truncates the passw..."

2013-06-13T17:24:32Z

Created page with "==The Problem== The Cisco implementation for Dynamic DNS updating is broken in two ways that I've found: * Firstly, there's Cisco Bug ID CSCtx50249, which truncates the passw..."

New page

==The Problem==
The Cisco implementation for Dynamic DNS updating is broken in two ways that I've found:

* Firstly, there's Cisco Bug ID CSCtx50249, which truncates the password in the URL to 15 characters. DynDNS providers that generate a key for your domain seem to prefer 16 characters.
* On the 830-series of routers, the DynDNS updater does not do HTTP/1.1 requests to the server, but instead an HTTP/1.0 request. This is a problem with EasyDNS, as their update server is on a virtual host, which requires an HTTP/1.1 request in order to present the user with the correct website. This doesn't appear to be an issue on the 1800 or 870-series.

==The Solution==
Use Cisco's IP SLA functionality to generate the proper request.

ip sla 1
http raw http://api.cp.easydns.com
http-raw-request
GET /dyn/tomato.php?hostname=dyn.example.ca HTTP/1.1\r\n
Host: api.cp.easydns.com\r\n
Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=\r\n
\r\n
end
exit
frequency 3600
ip sla schedule 1 life forever start-time now

← Older revision		Revision as of 20:44, 13 June 2013
Line 7:		Line 7:

	==The Solution==		==The Solution==
−	Use Cisco's IP SLA functionality to generate the proper request. This will periodically request the update page, at the specified frequency, which will update the specified hostname.	+	Use Cisco's IP SLA functionality to generate the proper request. This will periodically request the update page, at the specified frequency, which will update the specified hostname. It allows you to manually set the HTTP/1.1 virtual host, and it allows for passwords over 15 characters.

@@ Line 20: / Line 20: @@
 Replace '''dyn.example.ca''' with your hostname.  Replace '''dXNlcm5hbWU6cGFzc3dvcmQ=''' with the key generated above.  If you're not using EasyDNS, replace the '''api.cp.easydns.com''' and '''/dyn/tomato.php''' with the appropriate values for your provider.
-<PRE style="color:white;background-color:black;font-weight:bold;font-size:1.2em;">
+<PRE>
 ip sla 1
   http raw http://api.cp.easydns.com

@@ Line 7: / Line 7: @@
 ==The Solution==
-Use Cisco's IP SLA functionality to generate the proper request.  This will periodically request the update page, at the specified frequency, which will update the specified hostname.  If you're not using EasyDNS, replace the '''api.cp.easydns.com''' and '''/dyn/tomato.php''' with the appropriate values for your provider.
+Use Cisco's IP SLA functionality to generate the proper request.  This will periodically request the update page, at the specified frequency, which will update the specified hostname.
 ===Generate The Authorization Key===
-Go to http://www.base64encode.org/, enter '''username:password''' and click the Encode button.  Copy the whole thing, including the trailing = sign.  The result is used below.
+# Go to http://www.base64encode.org/.
 ===Create The IP SLA Policy===
-Replace '''dyn.example.ca''' with your hostname.  Replace '''dXNlcm5hbWU6cGFzc3dvcmQ=''' with the key generated above.
+Replace '''dyn.example.ca''' with your hostname.  Replace '''dXNlcm5hbWU6cGFzc3dvcmQ=''' with the key generated above.  If you're not using EasyDNS, replace the '''api.cp.easydns.com''' and '''/dyn/tomato.php''' with the appropriate values for your provider.
 <PRE style="color:white;background-color:black;font-weight:bold;font-size:1.2em;">

@@ Line 7: / Line 7: @@
 ==The Solution==
-Use Cisco's IP SLA functionality to generate the proper request.  This will periodically request the update page, at the specified frequency, which will update the specified hostname.
+Use Cisco's IP SLA functionality to generate the proper request.  This will periodically request the update page, at the specified frequency, which will update the specified hostname.  If you're not using EasyDNS, replace the '''api.cp.easydns.com''' and '''/dyn/tomato.php''' with the appropriate values for your provider.
 ===Generate The Authorization Key===
 Go to http://www.base64encode.org/, enter '''username:password''' and click the Encode button.  Copy the whole thing, including the trailing = sign.  The result is used below.
 ===Create The IP SLA Policy===
 <PRE style="color:white;background-color:black;font-weight:bold;font-size:1.2em;">
 ip sla 1