Re: 1720 and comcast

1. Enable internal syslogging:

conf t
logging buffer 10000 debug
exit
wri mem




2. Verify that the "outside" interface connected to the cable modem is
up & up

sh int e 0
!

! 3. Enable DHCP debugging

debug dhcp detail


4. Shut/no shut outside interface or otherwise cuase it to initiate
DHCP request


5. Try adding the additional optional parameters for DHCP

conf t
int e 0
! The DISCOVER message contains the MAC address of the Ethernet 0
interface
! in the client ID field and contains the default host name of the
router in the
! option 12 field.
ip address dhcp client-id ethernet0
exit
wri mem

repeat the above troubleshooting steps


after finished testing disable debug

undebug all

use "show log" to see debug messages in internal logging buffer


see
http://www.cisco.com/en/US/tech/tk86/tk89/technologies_configuration_example09186a0080094be1.shtml


Also you need to add a default route:

conf t
ip route 0.0.0.0 0.0.0.0 dhcp
wri mem

.

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