Unlocking Internet and MAC-Bundled Cracks

The school has recently bundled MAC and IP, and has restricted the time on the server (Win2K). It’s really annoying, I think I’m never Restricted people, how can you just like this? The old saying goes well, "There are policies, there are countermeasures", then I will kill it and say dry.
The principle is as follows:
MAC and IP binding are on the server, then everyone thinks, what should be the scope? Of course, only on the server to the client, but if I modify the IP on the client, what about the server? If you have already thought of this, then you have theoretically cracked the bundle.
The steps are as follows:
1, first to find out the scope of the IP and the range of the restricted IP, if the IP is 172.16.xxx.xxx, the MAC is 52-54-AB-12-34-56, then The IP range should be at 172.16.11——172.16.255.255, I don't think it's possible to bundle it all the time, otherwise you can only wait for the die.
2, 172.16.0.1 & mdash; & mdash; 172.16.255.255 to do a complete scan, in order to avoid unnecessary trouble (IP conflict), causing the attention of the network management, then it does not matter.
3, find the IP used by no one, from 172.16.255.255 to 172.16.0.1, because the general network management is used from 172.16.0.1, the latter is generally not used, the breakthrough is here.
4, in the network neighborhood -> properties -> TCP /IP properties fixed just got the IP address, 95/98/ME please see the fifth step, 2K, XP to this point, open IE try it, Flying on the Internet again.
5, modified IP on the 95/98/ME system, will prompt to restart, in case the machine installation restore card or similar products can only not restart, then in my computer -> properties -> network card -> After disabling and then enabling (need to wait for a while) -> OK, try to open IE now, it is already OK.
This is the completion of the crack.
Workaround:
Install the ISA type of proxy service software for management, the most secure is to divide the VLAN, but the switch has to support