Belkin High Performance Wireless VPN Router N300 - Manual (Page 123)

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TOOLS
Dynamic DNS (DDNS)
This free service is very useful when combined with the Virtual
Server feature. It allows Internet users to connect to your
Virtual Servers using a URL, rather than an IP Address.
This also solves the problem of having a dynamic IP address. With
a dynamic IP address, your IP address may change whenever
you connect, which makes it difficult to connect to you.