Cisco 851 as DHCP client to ISP

looks like the latter but wanted to be sure.

should do

try

ip dhcp pool import all

Dynamic Host Configuration Protocl (DHCP), defined in RFC 2132, is a process by which multiple IP configuration variables are passed from a DHCP server to a DHCP client for use. These can include: * IP address * subnet mask * default gateway * multiple DNS servers * multiple WINS servers * WINS lookup options * DNS domain name suffix * hostname * multiple time servers * TFTP server * boot file ...and many other configurable options.

Your Cisco 851 router with DHCP enabled on its Internet interface receives the DNS server list from your ISP.