Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Cable modem connection to internet


I am working on seting up a lab connecting a 3640 router to internet via cable modem, I have attached the network dia and sample config.

I am sucessfull getting the IP add assigned to internet facing router Interface from ISP and I can ping google from my router, problem is my laptop connected to switch to the the router can not ping any internet site nor the default gateway of router interface

please assist me in getting working config for this senario.



Re: Cable modem connection to internet

On your diagram e0/1 config is The DG for the PC is .1

Are you sure the router has .1?

Can the switch ping the router or the PC?

New Member

Re: Cable modem connection to internet

switch ip add is router e0/1 ip add is

the strange thing is that router can ping the switch and switch can ping the PC but pc can not ping the router ?

I worked it out many times trying to do the config from scratch but it never works also I tried to eliminate the switch by directly connecting the pc with crossover cable to router but at this point router has internet connectivity but pc can not ping router or internet. i have tried disabling windows firewall, also the AVG

please assist as this is my base lab and I want to do many labs based on this lab ..

Thanks again