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Community Member

Assistance Configuring ISR2811 Behind Dynamic IP Comcast Cable Modem

I am attaching two files:

1. ISR2811-to-CM is the configuration for the router that is behind Comcast Cable Modem.

2. DHCP-Debug is the debug monitor report for DHCP behavior.

I am almost left to believe that Camcast may be filtering dynamic DHCP.

Thanks for the help.

Wil

1 ACCEPTED SOLUTION

Accepted Solutions
Bronze

Re: Assistance Configuring ISR2811 Behind Dynamic IP Comcast Cab

Sure.

If you could, mark this as "solved" for others.

Thanks. Glad I could help.

5 REPLIES
Bronze

Re: Assistance Configuring ISR2811 Behind Dynamic IP Comcast Cab

For one, I can tell you that you don't need your ip route. DHCP will give you your route.

Have you reset your modem since hooking your router up to it? If there was a device on your modem before hand, the modem may need power-cycled.

Other than that, your config for fa0/1 looks fine, but set duplex to auto as you have "speed" set, too.

Community Member

Re: Assistance Configuring ISR2811 Behind Dynamic IP Comcast Cab

Yes, a wireless router was previously connected to the cable modem. The effort is to replace it with the 2811. No, I did not power cycle the cable modem after connecting the 2811 to it. I will try that and configure the speed on Fa0/1 to auto consistent with the duplex. Good suggestions. Thanks.

Bronze

Re: Assistance Configuring ISR2811 Behind Dynamic IP Comcast Cab

Sure. Just let us know if it works.

Community Member

Re: Assistance Configuring ISR2811 Behind Dynamic IP Comcast Cab

Thanks again. It works just fine now. I power cycled the Cable Modem and adjusted the interface speed to auto consistent with the duplex.

Onto tinkering with IPS now.

Thanks again.

Bronze

Re: Assistance Configuring ISR2811 Behind Dynamic IP Comcast Cab

Sure.

If you could, mark this as "solved" for others.

Thanks. Glad I could help.

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