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ok, one at a time:
1) i don't see any reason why you can't use mac address cloning to make the isp's server think your linksys router is a cisco
2) NAT is Network Address Translation. your router gets your public IP, your computer(s) have private IP's, thus, when something gets sent to you, it hits your router, and your router has to forward the port to your computer
3) DHCP, Dynamic Host Configuration Protocol, if your IP is static and you have to manually enter the info, you want to disable this, DHCP is just a way to dynamically assign IP addresses instead of them being hard coded into a router config
4) with your config, i don't think it's possible to disable NAT on that linksys router if it is assigned your static ip instead of a nic in your pc
5) the easiest way to open all the ports at once, if you want to do that, is to use DMZ on your router, just put your private IP, eg, 192.168.0.1, into the DMZ options, and everything will get forwarded to your PC
as far as cisco config goes, good luck, i can't help you there, never used a cisco router before
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Hybrid Mode
