Cisco 2621 behind a DSL modem

Answered Question
Mar 31st, 2008

I recently bought a cisco 2621 router for my small home based business. My ISP is Embarq DSL. I got the router and modem working together but only as the cable modem doing the NATing. The internet is not very relaiable with this setup. I want to try it now with the 660 series modem in bridge mode. I put the modem in bridge mode and I am now pulling a public IP instead of a 192.168.2.2 now. All Interfaces are Up and UP. My interfaces are:


fa0/0 wan side

fa0/1 lan side 192.168.1.1/24


NAT is configured as follows:


interface fastEthernet0/0

ip nat outside

interface fastEthernet0/1

ip nat inside


ip nat inside source list 10 interface ethernet0/0 overload


access-list 10 permit 192.168.1.0 0.0.0.255


I still cant browse the internet. Anyone ever did this kind of setup with a DSL modem in bridge mode? Ideas of what I missed?

Correct Answer by evsrajatgupta about 8 years 11 months ago

Hi wesley.roberts,

You need two more things

1) Routing for internet

Command on the interface mode

IP router 0.0.0.0 0.0.0.0 fa0/0

2) Ip address on the wan interface

Mostly ISP use dynamic IP address allocation.

Thus use "ip address dhcp" or “ip negotiate” depending on your IOS.


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Correct Answer
evsrajatgupta Tue, 04/01/2008 - 07:05

Hi wesley.roberts,

You need two more things

1) Routing for internet

Command on the interface mode

IP router 0.0.0.0 0.0.0.0 fa0/0

2) Ip address on the wan interface

Mostly ISP use dynamic IP address allocation.

Thus use "ip address dhcp" or “ip negotiate” depending on your IOS.


Please Rate



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