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The downside of using DDNS function in a router is that DynDNS will drop your account (actually only the single DNS entry within your account) after 30 days if it hasn't been "touched" in that time. Router-based DDNS service usually will touch (update) the DynDNS site only when your IP address has changed, not on a 30-day timer. If, as is often the case, your IP address is not changed by your ISP in more than 30 days, you will lose your DynDNS account entry.