Clearwire is rolling out WiMAX in the Seattle area, and that comes with new modems that force you to use NAT. They aren't giving their customers public IP addresses at all. This makes running IPSEC based VPNs or 6to4 tunnels over Clearwire next to impossible, and I consider Internet service that only comes with non-publicly routeable IP address to not be real Internet service at all.
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