You don't need to reconfigure IIS necessarily. Instead, I recommend using a dynamic DNS service to create a DNS address (such as www.myserver.com) that is constantly updated with your current IP address. Some services charge, some are free. All will require you to install a small client on your IIS server that detects when your IP address has changed and updates your DNS record. Here's a good place to start: http://www.technopagan.org/dynamic/
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