DHCP configuration problem

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http://serverfault.com – EDIT: We have following setup: User comes to building, he gets address from range for unknown clients ( and can only get to our web site. We call it anonymous range. Let's say our user acquired address and won§t get past the local network. Then he must go and register his MAC address and is assigned new fixed IP from address range. DHCP configuration is updated and reloaded. User then "gets to the Internet" because this range is not blocked by firewall. ipconfig /release /renew routine worked every time. What happened this week: After user re (HowTos)