my 871 router will acquire a dhcp address from cox, and will work for awhile. After a seemingly random amount of time, I lose connectivity out the wan port. A release dhcp and renew dhcp at this point will fix the problem for another 'random' period of time. A linksys router has been working fine at this location for 2 years.
bringing same router into my work, it will not receive an ip address at all from our campus dhcp server. a computer hooked to this same port connects with no problems.
i also tried wiping out startup config, and only entering the following which yielded the same results:
ip address dhcp
i can statically assign an ip address to the wan interface, and everything works just fine.
as far as ios, i was initially using:
then upgraded to the following which made no difference:
i've been searching everywhere for a solution with nothing - and have asked cisco guys at work who tell me my config should work as is both at home and at work.
i'm thinking that i am either missing something simple, or i perhaps have a hardware problem.