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Inadyn is a free DDNS client. It makes is possible to have a fixed Internet hostname registered to a dynamic IP address.
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README

README
======

Inadyn is a simple and small DDNS client written in the C language.  DDNS is a popular
service for Internet users with dynamically allocated IP addresses.

If your ISP provides you with a DHCP or PPPoE/PPPoA connection you risk losing your
IP address every time you reconnect, or in DHCP even when the lease is renegotiated.

By using a DDNS client such as inadyn you can register an Internet name at certain
providers that the DDNS client updates, periodically and/or on demand when your IP
changes.

Inadyn can maintain multiple host names with the same IP address, and has a web based
IP detection which runs well behind a NAT router.

Common DDNS service providers supported by inadyn:

       http://www.dyndns.org
       http://freedns.afraid.org
       http://www.zoneedit.com
       http://www.no-ip.com
       http://www.easydns.com
       http://www.tzo.com
       http://www.3322.org
       http://www.dnsomatic.com
       http://www.tunnelbroker.net, i.e., http://dns.he.net/
       http://www.dynsip.org
       http://www.sitelutions.com

Some of these services are free of charge for non-commercial use, others take a small
fee, but also provide more domains to choose from.

Multiple Accounts Support
=========================
Inadyn supports updating several DDNS servers, several accounts even on different
DDNS providers.  The following example config file illustrates how it can be used.

Feature is courtesy of Christian Eyrich <http://eyrich-net.org/programmiertes.html>

background
verbose 1
logfile /var/log/inadyn.log
pidfile /var/run/inadyn.pid

system dyndns@dyndns.org
username yxxx
password xyxx
period 300
alias yyyy
alias yyyy

system default@no-ip.com
username xxyx
password xxxy
period 300
alias yyyy

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