I would just like to add my experience with moving from a Fixed IP on ADSL to Dynamic IP on FTTN. 1. I use OpenDNS for network wide content filtering and the settings need to be updated every time the IP address changes. Sometimes this does not work as the new IP address may already be registered on the OpenDNS database and there can be a long delay getting it reallocated. I have found it easier just rebooting my router multiple times until I get an IP that hasn't been previously used on the OpenDNS database. Frustrating. 2. Keeping OpenDNS (and other IP addressed based services) updated automatically requires running a client like ddclient. This needs to be running on an "always on" computer, which isn’t usual in a normal family home type environment. Even when this does work, there is a delay as the client will only check once every hour maybe, so the filtering is effectively off during this time. 3. It is common to pick up a new IP address that is appears on one or more Blacklisted databases, causing issues with email and requiring manual removal. Anyway, I hope that fixed IP addresses will soon be available on the residential plans.
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