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CISCO 800 Router connecting to ISP Router Problem w/TFTP

The ISP router is set up to use DHCP ( network which works fine. I want to use my CISCO router to assign ( network. The problem I came accross is that my int e1 has a address and the host is assigned a address. My problem is TFTP will not work. when I want to transfer files via TFTPI named the router and identifed the DNS Service and gateway with no problem. My computer attached to the cisco router was properly assigned, but the port carries the ISP's address. I can manually change the IP address, but now I can not access the internet. How can I set the cisco router to communicate to the ISP router without changing the address if I want to transfer files via TFTP?

Thank you

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