We have a Cisco 871 router running ip advanceservices 124-11.T that is connected on int F4 to a cable modem. The ISP allocates public ip addresses via dhcp. The problem we are having is that when the router boots up, it does not get an ip address assigned by the ISP. Attempts to unplug and reconnect the cat5 cable has no affect. Oddly though, if you console/vty onto the router and preform a shut and then no shut on F4, the router gets an ip address from the ISP. I thought possibly the problem may have been an acl issue or that a client-id and/or hostname needed to be defined on the F4 interface for the ISP's DHCP server, but adding both entries (client-id fasteternet 4 and sohort1 hostname) didn't help, and pulling the access-group off int F4 had no affect either.
Anyone ever encounter this type of problem before?