I have a cisco 1841 router with WIC 1 DSU-T1 V2 installed in slot 0.
However we moved our offices and now have a Time Warner Business Class cable modem service which arrives as ethernet from their modem.
What I want to do is use eth 0/0 as a DMZ port for web and mail server and use eth 0/1 for NAT and DHCP for work stations. There is 5 routable IP's in which 4 have been dedicate to servers (mail and web) that would be in the DMZ zone. The last one can be used for the NAT'ed and DHCP stations.
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Detail information regarding how many NAT clients is required. Access to the router via telnet or ssh is required. Access via web interface can speed up the configuration.
I have solid experience as a CCNP and CCIP. Your project is a routine in my work as an Internetwork Professional for clients. You'll definitely be up and running in no time.