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Dynamic Dns Services:

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cmd:ddclient

Basic Info

Info

Update dynamic IP address at DynDNS.org

Description

A perl based client to update your dynamic IP address at DynDNS.org (or other dynamic DNS services such as Hammernode, Zoneedit or EasyDNS), thus allowing you and others to use a fixed hostname (myhost.dyndns.org) to access your machine.

Features

This client supports both the dynamic and (near) static services, MX setting, and alternative host.
It caches the address, and only attempts the update if the address actually changes.

Dynamic DNS services currently supported include:

DynDNS.org - See http://www.dyndns.org for details on obtaining a free account.
Hammernode - See http://www.hn.org for details on obtaining a free account.
Zoneedit   - See http://www.zoneedit.com for details.
EasyDNS    - See http://www.easydns.com for details.
NameCheap  - See http://www.namecheap.com for details

Releases

2006.07.22: v3.6.7

Help

Detail Help

using ddclient with ppp
using ddclient with cron
using ddclient with dhcpcd-1.3.17
using ddclient with dhclient

using ddclient with dhclient

you can update your DynDNS entry automatically every time your lease is obtained or renewed by creating an executable file named:

/etc/dhclient-exit-hooks

ie.:

cp sample-etc_dhclient-exit-hooks /etc/dhclient-exit-hooks

Edit /etc/dhclient-exit-hooks to change any options required.

http://ddclient.cvs.sourceforge.net/ddclient/ddclient/sample-etc_dhclient-exit-hooks?revision=1.1.1.1&view=markup

#!/bin/sh
######################################################################
## $Header: /cvsroot/ddclient/ddclient/sample-etc_dhclient-exit-hooks,v 1.1.1.1 2004/08/13 22:29:17 wimpunk Exp $
######################################################################
# The /etc/dhclient-enter-hooks script is run by the ISC DHCP client's standard
# update script whenever dhclient obtains or renews an address.

PATH=/usr/sbin:${PATH}
case "$new_ip_address" in
10.*)           ;;
172.1[6-9].* | 172.2[0-9].* | 172.3[0-1].*)     ;;
192.168.*)      ;;
*)
        logger -t dhclient IP address changed to $new_ip_address
        ddclient -daemon=0 -syslog -use=ip -ip=$new_ip_address >/dev/null 2>&1
        ;;
esac

Note: If your adsl modem is acting like a DHCP server, then this would not work. I have the following line in /etc/dhclient-exit-hooks, which proofs that when I get a new external IP, the /etc/dhclient-exit-hooks is not called.

logger -t dhclient IP address changed

Troubleshooting

enable debugging and verbose messages.

$ ddclient -daemon=0 -debug -verbose -noquiet

Do you need to specify a proxy? If so, just add a proxy=your.isp.proxy to the ddclient.conf file.
Define the IP address of your router with fw=xxx.xxx.xxx.xxx in /etc/ddclient/ddclient.conf and then try
```
$ ddclient -daemon=0 -query
```
to see if the router status web page can be understood.
Need support for another router/firewall?
Define the router status page yourself with:
```
fw=url-to-your-router's-status-page
fw-skip=any-string-preceding-your-IP-address
```
ddclient does something like this to provide builtin support for common routers. For example, the Linksys routers could have been added with:
```
fw=192.168.1.1/Status.htm
  fw-skip=WAN.*?IP Address
```
OR Send me the output from:
```
$ ddclient -geturl {fw-ip-status-url} [-login login [-password password]]
```
and I'll add it to the next release!
ie. for my fw/router I used:
```
$ ddclient -geturl 192.168.1.254/status.htm
```
Some broadband routers require the use of a password when ddclient accesses its status page to determine the router's WAN IP address. If this is the case for your router, add
```
fw-login=your-router-login
fw-password=your-router-password
```
to the beginning of your ddclient.conf file. Note that some routers use either 'root' or 'admin' as their login while some others accept anything.