We help IT Professionals succeed at work.

Cisco SB101 & Cablemodem DHCP Problem

davegaff
davegaff asked
on
629 Views
Last Modified: 2013-12-14
I recently obtained a Cisco SB101 router and have attempted to connect to my cablemodem service.  For some reason, the router will not obtain an IP address via DHCP.  If I connect my cablemodem directly to my laptop I am able to obtain an IP address successfully.  I've confirmed that my ISP does not do any MAC filtering.  Further, if I then write down the IP address obtained on the laptop and then set my router to the same static IP address my internet works just fine.  Can anyone help?
Comment
Watch Question

CERTIFIED EXPERT

Commented:
How are you configuring the router's WAN interface?

Should just be 'ip address DHCP'

Author

Commented:
'ip address dhcp' is what I've done (I've also tried this through Cisco SDM)
CERTIFIED EXPERT

Commented:
Sure sounds like your ISP has locked in on the one MAC.  You could test this theory by getting the mac address of the computer that worked, then issuing the command 'mac-address xxxx.yyyy.zzzz'

You could also try the Cable modem reset trick.  Unplug the cable modem from power(don't just turn it off) for 15 minutes, then hook it back up with the router connected.
Commented:
Unlock this solution and get a sample of our free trial.
(No credit card required)
UNLOCK SOLUTION

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a sample view!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.