cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
1859
Views
0
Helpful
2
Replies

Link 2801 to Comcast Cable Internet

burkedcwelchpkg
Level 1
Level 1

Got my CCNA PT 1 test passed and I'm hyped on Cisco!!!! Got my hands on a 2801 router and a DOCSIS 2.0 HWIC.  I want to make sure the Comcast yahoos that are coming later this week just have to plug in and go.  Thanks for any help in advance.  Here's my runnning config:

burke-rtr#sh run

Building configuration...

Current configuration : 1673 bytes

!

version 15.1

service timestamps debug datetime msec

service timestamps log datetime msec

service password-encryption

!

hostname burke-rtr

!

boot-start-marker

boot-end-marker

!

!

enable password

!

no aaa new-model

!

dot11 syslog

no ip source-route

!

!

no ip dhcp use vrf connected

ip dhcp excluded-address 192.168.1.1 192.168.1.150

!

ip dhcp pool LAN

import all

network 192.168.1.0 255.255.255.0

default-router 192.168.1.1

dns-server 192.168.1.1

!

!

!

ip cef

no ip domain lookup

ip domain name comcast.net

ip name-server 68.87.71.226

ip name-server 75.75.75.75

ip name-server 75.75.76.76

!

multilink bundle-name authenticated

!

crypto pki token default removal timeout 0

!

!

!

!

archive

log config

  hidekeys

!

redundancy

!

!

!

!

!

!

!

!

!

interface FastEthernet0/0

description LAN to WAN

ip address 192.168.1.2 255.255.255.0

ip nat inside

ip virtual-reassembly in

duplex auto

speed auto

no mop enabled

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Cable-Modem0/2/0

description Comcast-Link

ip address dhcp

no ip redirects

no ip unreachables

ip nbar protocol-discovery

ip nat outside

ip virtual-reassembly in

no shutdown

random-detect dscp-based

no cdp enable

!

ip forward-protocol nd

!

!

no ip http server

no ip http secure-server

ip nat inside source list 1 interface Cable-Modem0/2/0 overload

ip route 0.0.0.0 0.0.0.0 Cable-Modem0/2/0

!

access-list 1 permit 192.168.1.0 0.0.0.255

!

!

!

!

!

control-plane

!

!

!

line con 0

line aux 0

line vty 0 4

password

login

transport input all

!

scheduler allocate 20000 1000

end

***I don't know Comcast's DNS servers so I just put in what was on the website.  Is my DHCP ok?  Also on the cable interface, does everything look good? My local routing local traffic just fine, but that's to be expected.  I saw some people put there lan interface into a VLAN.  Do I need to do this.  Again thank you!  Also, when I do a sh int the mac address that comes up is 0000.0000.0000.  Should I give them the MAC address on the card?  obvisouly all the 0's is not valid.  I thought the cable modems should two MACs, that's why I ask.  Lastly the cable modem interface goes to an administrative shutdown state after I reload the router.  Is this to be exepted?  Thank you!

1 Accepted Solution

Accepted Solutions

John Blakley
VIP Alumni
VIP Alumni

David,

Congrats on your CCNA

First, the name servers in the router config don't get passed to your client. Those only allow you to be able to do name lookups from within the router like pinging www.cisco.com. The dns-server config that you have under your dhcp pool is where you would configure your dns servers that get passed back to your clients. As far as the config on the cable card, I'm not sure; I've never configured one in the past. I'd be surprised if Comcast connects your equipment though. Generally, they're going to connect their modem to make sure that they can get on the internet, they'll run their tests, and then you're on your own. Aside from that, if you just can't get your card to work, you can always connect the cable modem directly to the interface of your router and then the inside interface of the router will connect to your switch and you should be able to pass traffic fine...

HTH,

John

HTH, John *** Please rate all useful posts ***

View solution in original post

2 Replies 2

John Blakley
VIP Alumni
VIP Alumni

David,

Congrats on your CCNA

First, the name servers in the router config don't get passed to your client. Those only allow you to be able to do name lookups from within the router like pinging www.cisco.com. The dns-server config that you have under your dhcp pool is where you would configure your dns servers that get passed back to your clients. As far as the config on the cable card, I'm not sure; I've never configured one in the past. I'd be surprised if Comcast connects your equipment though. Generally, they're going to connect their modem to make sure that they can get on the internet, they'll run their tests, and then you're on your own. Aside from that, if you just can't get your card to work, you can always connect the cable modem directly to the interface of your router and then the inside interface of the router will connect to your switch and you should be able to pass traffic fine...

HTH,

John

HTH, John *** Please rate all useful posts ***

Thanks for the input. Turns out I needed a DOCSIS 3.0 compliant device to talk with my ISP.  Since Cisco does not have these cards, I had to go out and get a modem.  The cable HWIC is actually a supported device, but like you said they hook up their equipment test and you're on your own.  I am enjoying my 35Mb downloads though.