05-13-2010 01:05 PM - edited 03-04-2019 08:28 AM
I have a Cisco 2811 connected to a cable modem , and i cant get it to get an IP. i am able to get an IP with a workstation and a Pix 501, but not this device. Based on the below, does anyone know a reason why i wouldnt be able to get an IP? i recently added this to tinker arround (replaced a linux distro router), and i cant figure out why it wouldnt be able to get an IP...
interface FastEthernet0/1
description $FW_OUTSIDE$
ip address dhcp
ip access-group 101 in
ip nat outside
ip inspect SDM_LOW out
ip virtual-reassembly
ip route-cache flow
duplex auto
speed auto
05-13-2010 01:14 PM
note:
yes, i have restarted the router and the modem multiple times.
yes, i did leave the modem unplugged for 15 minuets.
05-13-2010 11:15 PM
Hello Danielle,
two features could be blocking DHCP message exchange:
the applied access-list
ip access-group 101 in
and CBAC
ip inspect SDM_LOW out
as a first troubleshooting you could remove these two commands using
int fas0/1
no ip access-group 101 in
no ip inspect SDM_LOW out
if after this change your router gets an IP address you will need to tune these two feature configuration
Hope to help
Giuseppe
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