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New Member

Cisco 1605R and SurfBoard cable modem.

Hello, I configured my router based on this document http://www.cisco.com/warp/public/109/router_behind_cm_19268.shtml but the outside interface doesn't get an ip address from the cable modem, I made a debug dhcp details and the interface keeps sending acks to the dhcp server but there is no response, i also set the mac-address of the interface the same as the nic where the cable modem was connected.

Please i need a help on this.

2 REPLIES
New Member

Re: Cisco 1605R and SurfBoard cable modem.

My config that works is

interface Ethernet0/1

description connected to cablemodem

mac-address

ip address dhcp

no ip redirects

no ip unreachables

no ip proxy-arp

ip nat outside

no ip mroute-cache

half-duplex

no cdp enable

!

When I created the cablemodem connection, I used an old 3Com 3C509 10meg Nic for the tech to create the connection. They registered my MAC in their DHCP as a restricted connection.

When the tech left, I removed the NIC from the PC and placed the MAC on this i/f then rebooted the router. I got the same IP as the PC did, then I started adding in the usual access lists and controls.

-Jeff

New Member

Re: Cisco 1605R and SurfBoard cable modem.

Thanks, I didn't use this commands...

interface Ethernet0/1

description connected to cablemodem

mac-address

ip address dhcp

no ip redirects - THIS ONE

no ip unreachables - THIS ONE

no ip proxy-arp - THIS ONE

ip nat outside

no ip mroute-cache - THIS ONE

half-duplex - THIS ONE - NO SUPPORTED BY MY INTERFACE

no cdp enable

Well, I will try to add this commands to my configuration, but just for curiousity,

why when make a debug dhcp detail i get an error that says something like "unknow dhcp problem, no allocation possible".

Thanks in advance Jeff.

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