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Using Your Cisco Router with No-IP Dynamic DNS Services

Cisco IOS versions 12.4 and later have the capability to directly update your No-IP hostname using a built-in DDNS client. If you have a Cisco router with the latest firmware, this support is already built into it. We offer these examples below for informational purposes only and recommend that router configuration changes be made by qualified personnel to minimize the risk of losing Internet connectivity or causing other damage to the router.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. ip ddns update method method-name
  4. ddns [both]
  5. internal name-cache
  6. http
  7. add url
  8. remove url
  9. interval maximum days hours minutes seconds
  10. exit
  11. exit
  12. interface interface-type number
  13. ip ddns update hostname hostname
  14. ip ddns update method method-name
  15. exit

DETAILED STEPS

Command or Action Purpose
Step 1 enable
Example:
Router> enable 		Enables privileged EXEC mode. •Enter your password if prompted.
Step 2 configure terminal
Example:
Router# configure terminal 		Enters global configuration mode.
Step 3 ip ddns update method method-name
Example:
Router(config)# ip ddns update method myupdate 		Specifies the update method name.
Step 4 ddns [both]
Example:
Router(DDNS-update-method)# ddns 		Configures DDNS as the update method and enters update method configuration mode. The both keyword specifies that both A and PTR RRs will be updated. Note You can specify DDNS or HTTP but not both in one step. If you have specified DDNS, you must disable it by using the no ddns command before you can configure HTTP. For the HTTP configuration, see Steps 5, 6, and 7.
Step 5 internal name-cache
Example:
Router(DDNS-update-method)# internal mycache 		Specifies that an internal cache will be used as the update method.
Step 6 http
Example:
Router(DDNS-update-method)# http 		Configures HTTP as the update method and enters DDNS-HTTP configuration mode.
Step 7 add url
Example:
Router(DDNS-HTTP)# add http://username:password%40dynupdate.no-
ip.com/nic/update%3Fhostname=
hostname.yourdomain.com 		Configures a URL that should be invoked in order to add or change a mapping between a hostname and an IP address. The following example of a URL specifies adding or changing the mapping information using No-IP.com: •http://username:password%40dynupdate.no-ip.com/nic/update%3Fhostname=hostname.yourdomain.com. You have to input the URL string noted above. •Alternatively, you can use the URL string http://username:password%40dynupdate.no-ip.com/nic/update%3Fhostname=&myip= The special character strings and will be substituted with the hostname to update and the IP address with which that hostname should be associated, respectively.

Note: Use the html encoding of %40 for the "@" symbol and %3F for the "?" symbol or IOS will complain.
Step 8 remove url
Example:
Router(DDNS-HTTP)# add http://username:password%40dynupdate.no-ip.com/nic/update%3F
hostname=hostname.yourdomain.com 		Configures a URL that should be invoked in order to remove a mapping between a hostname and an IP address. The URL takes the same form as the add keyword in Step 6.

Note: Use the html encoding of %40 for the "@" symbol and %3F for the "?" symbol or IOS will complain.
Step 9 interval maximum days hours minutes seconds
Example:
Router(DDNS-HTTP)# interval maximum 1 0 0 0 		Configures a maximum update interval. The arguments are as follows: •days—Range is from 1 to 365. •hours—Range is from 1 to 24. •minutes—Range is from 1 to 60. •seconds—Range is from 1 to 60.
Step 10 exit
Example:
Router(DDNS-HTTP)# exit 		Exits to update-method configuration mode.
Step 11 exit
Example:
Router(DDNS-update-method)# exit 		Exits to global configuration mode.
Step 12 interface interface-type number
Example:
Router(config)# interface ether1 		Enters interface mode.
Step 13 ip ddns update hosthame hostname
Example:
Router(config-if)# ip ddns update hostname hostname.yourdomain.com 		Specifies a host to be used for the updates. The update will associate this hostname with the configured IP address of the interface. The hostname argument specifies the hostname that will receive the updates (for example, yourdomain.com).
Step 14 ip ddns update method method-name
Example:
Router(config-if) ip ddns update myupdate 		Specifies the name of the update method to use for sending Dynamic DNS updates associated with address changes on this interface.
Step 15 exit
Example:
Router(config)# exit 		Exits to privileged EXEC mode.

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