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I am searching for some tool like a DynDNS updater - but I am looking for a free one. The tool should report the IP change of the server, so I can access it always. Is there any free tool/service which support this ? Thank you.

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Why is your server changing IP? It shouldn't. If you're talking about being able to access your home PC from anywhere, then this belongs on SuperUser.com –  Izzy Aug 7 '09 at 22:06
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5 Answers

Check your router as some routers have this function build in..

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DynDNS has a free updated client, or you can update it from many consumer routers.

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You can use the afraid.org and it has many free clients to update the IP and if you have a dd-wrt it has support for it.

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+1 for afraid.org. You can choose hundreds of domains to use or even your owh (all for free).. –  sucuri Aug 8 '09 at 12:18
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yey, no-ip.org ... it´s free (just subdomains like hello123.no-ip.org). u can intall it form debian using apt-get install no-ip. U first must register at www.no-ip.org

Regards!

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I use a free no-ip subdomain and use a $3/month shared hosting with my own domain name to check if my server is online, and redirect appropriately. Really important things have a copy on my shared hosting as well. –  Alex S Aug 8 '09 at 5:12
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EveryDNS used to have this, but I switched to DynDNS because I found out my router has support for DynDNS.

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