cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
781
Views
0
Helpful
4
Replies

1811 and COmcast DHCP trouble

Marley Brown
Level 1
Level 1

Hello,

I have a router 1811 that was configure to use comcast static ip now is need to switched to DHCP.

I have started with a very simple config to try and establish an ip address on f1 or f0 but I can get the 1811 to pick one.

all I have done is:

int f1

ip add dhcp

no shut

if I go to ip int brief I have no IP address. If I do debug dhcp I get it can't get an IP or the IP is not for this device.

Any help would be greatly appreciated.

4 Replies 4

Reza Sharifi
Hall of Fame
Hall of Fame

Hi Marley,

In the global config mode try this command:

"service dhcp"

and test again

If still no connection post the configs for your interfaces.

HTH

Reza

Reza

I will try this on Wednesday. I have limited access to Comcast service with DHCP. If you have any other suggestions please let me know and I will try all of it.

Here is my int config:

interface FastEthernet1

description $ETH-WAN$

ip address dhcp

ip virtual-reassembly

duplex auto

speed auto

I am just trying the basics until I can get an IP address.

Thank you,

Marley

zartar911
Level 1
Level 1

Hi Marley,

If you have an access-list attached to your interface for incoming traffic, make sure you allow bootpc.

"permit udp any eq bootpc any eq bootpc"

Tim

Tim,

No access list on the interface.

Thank you,

Marley

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco