Cisco Switching/Routing :: Using 2611 Router To Connect To Internet Via Cable Modem
Sep 8, 2012
I am with Virgin media and have a home lab (2611 routers, 3550 switches, 2950s etc) which i usually just use for testing things on and practicing.
Now I tried to connect it to the internet and got some weird things happening.
I got NAT and DHCP client all setup correctly on the router (or so I think!) along with DNS settings but I still can't get Internet access.
My network is all setup right so that through using OSPF the router is the gateway (0.0.0.0 route) for all devices. Doing a traceroute confirms this.
Yet I never get any further than the router? I see IP nat translations ticking up as I send more requests but never get a webpage or a reply from any of the machines in my network.
HOWEVER... The router itself does get some replies from Google.co.uk and bbc.co.uk but doesn't seem to want to give anything else on the "inside" a response?
Here is a dump of config:
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
[Code].....
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Mar 11, 2012
My home lab is in a different room than the cable modem. I have a wireless N router in the room with the cable modem. I have a wireless access point that is connected to a Cisco 2611XM routers fa0/0 interface. The 2611 accepts the DHCP address from the wireless router. However, I can't ping past the wireless LAN 192.168.10.0 network. I know with the wireless router it's two layers of DHCP. Should remove the DHCP settings from the wireless router? The wireless router is a TrendNet TEW-651BR. I can ping my iphone or any device conntected to the wireless router. And my laptop can ping default gateway of the wireless router, which I assume is the cable modem, however the 2611 cannot. So I'm assuming that's why the hosts behind the 2611 can't get to the internet. I followed the below instructions. I know the instructions don't assume your using a wirelss router between 2611 and the cable modem. But, I really don't want to run a cable to the cable modem.
[URL]
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Oct 1, 2012
I am having an issue with my network that has me perplexed. I have a DPC3010 cable modem (Charter internet). I previously had it connected to a Linksys WRT54GL with DD-WRT installed and that was working OK except that I had to reboot it 2-3 times per week. I replaced it with a Cisco 861 (non-wireless) router and it worked OK for a few hours then it started dropping the internet connection (it goes up and down constantly). If I switch back to the Linksys everything works fine again. I am using the same cables in either case so I know it's not a cabling issue. I upgraded the firmware to c860-universalk9-mz.151-4.M3.bin, but it made no difference. I was starting to suspect a problem with the physical ports on the router, but I decided to try connecting the 861 behind the Linksys and turns out it works fine in that setup.
So to recap...
If I connect the 861 directly to the modem my internet connection bounces up and down
If I connect the Linksys directly to the modem my internet connection is fine
If I connect the Linksys directly to the modem and the 861 to the Linksys everything works fine (my PC is connected to the fe0 port of the 861)
Are the 861 and the modem simply incompatible or is it a configuration issue? I have attached my 861 config to this thread.
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Oct 8, 2012
I have a Home Virgin media cable connection at home. the only way to get this working with my Cisco gear is by putting the superhub on modem mode.On modem mode, it becomes just a dumb modem assigning and IP via DHCPI can get the switch to get an IP address from the modem with
no switchport
ip address dhcp
then I have created
0.0.0.0 0.0.0.0 fa0/48
to route traffic to the port connected to the mode,The switch gets the assigned Ip address from the modem but it does not route internet traffic.
From the different vlans and subnets on the switch, I can ping the modem.
From the switch I can ping 8.8.8.8
From the machines, i cannot ping 8.8.8.8
On my machines, what should be the gateway? the vlan SVI, the modem's IP address, The fa0/48 ip address? I have tried them all with no success.
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Jun 27, 2012
I updrade my wireless router from 54 mpb to 150. Now my pc/router isn't connecting to the modem. How do I correct
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Mar 26, 2013
I am attempting to install the router but cannot connect to SKY ISP. I can connect my laptop to the router both wirelessly and by cable.
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Jan 24, 2012
I have a cable modem with my 2600 Router and i have a little speed problem when I'm going out to the web via my F0/0.. according to regular speed test sites my speed is around 20mbps but when i hook up to my modem directly i get a solid 40mbps.. now I've changed my Cat 6 cable from my modem to my router and this are my settings in the router.
[Code] ...........
I see some drops and lost carriers but not sure what those might mean?
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Feb 7, 2012
I have a cable modem installed to my property but want to use my modem/router to go wireless. The proble is my cable modem output is a RJ45 and the router input is RJ11.
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May 23, 2011
My mother has an older Compaq laptop running XP home edition. She hasn't used this laptop for a while and it won't connect to the internet through her cable modem.I know it isn't a modem or ISP problem since my laptop will connect just fine. By the way, we are connecting to the cable modem with a cat 5.
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Aug 29, 2012
So saturday, my friend and i build my computer. Everything worked just fine that day. Sunday i had no problem connecting to the internet. Sunday is also the day i set up a password for my admin account.
Now when i came back from work monday, i tried to log in to my computer. As it appears, i forgot my password... (same i use on everything, so i must have messed up inputting my pass)
So i did a windows reset, since i had no CD or USB to reset my pass. I tried installing windows, and it appears 'this copy of windows is not genuine'. I thought, okay, no prob, as long as i have all options.
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Apr 8, 2013
I got some unexpected System crash, and this happens to 2 different routers on the same network.. (We suffer a Crash and change the router, happens the same to the new router after some time, maybe 40 minutes!!)
Here is the last console report for the new router....
%Software-forced reload
Preparing to dump core...
4w1d: %SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = IP NAT Age
[Code]....
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Mar 26, 2011
I have an Acer AM3100 desktop running Windows Vista. It is connected to a netgear wireless router via an ethernet cable. I also have two laptops connected to the same router. The laptops connect to the internet fine but the desktop doesn't. I connected to the internet fine (satellite) before I moved but won't connect now. Norton 360 can update automatically and Skype connects but I can't open web pages. I used the norton tool and uninstalled Norton 360 but it still won't connect. I'm attaching the ipconfig information.
Windows IP Configuration
Host Name . . . . . . . . . . . . : Kids-PC
Primary Dns Suffix . . . . . . . :
[Code]....
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May 2, 2012
I'm trying to configure a disco router 2600, my internet connection is via a cable modem. I get a dynamic IP from the cable modem but when I ping to any external IP I have errors.Copy show config and show interface f0/1
GUEST#show config
Using 1103 out of 29688 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
[ code]...
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Aug 6, 2012
Last week, a big storm rolled through my town while I was out of the area on business. I had a working LAN/WLAN for my home & home office, and the modem I was using got fried by the storm. Strangely enough nothing else was affected..Anyway, I went out and bought an identical modem, and had it set up with Comcast. If I connect directly to the modem, everything works perfectly. But when I try to attach my router to the new modem, I have no connectivity over wifi OR hardwired to the router. According to the status light on the router, it can't find a connected modem.I reset the router back to factory settings, installed the newest firmware, and moved my DHCP pool out of the default range. I then power cycled the whole setup - twice - with no success.
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Jan 9, 2012
I bought an ASUS Black Diamond Dual Band Wireless-N 600 Router (RT-N56U) to upgrade from my older router but I'm having a problem: It won't connect to my cable modem (via the WAN ethernet port), so I can't connect to the internet. [URL]
When I connect the router to my computer via ethernet cable, the light on the ethernet port of the router comes on (an orange LED light), but when I connect my cable modem (or computer) to the the router through the WAN ethernet port, the WAN port's LED does not come on at all and I keep getting an error message on my browser saying that I need to make sure the ethernet cable is connected.
I've tried three different ethernet cables, including the one that came with the router, with no luck (WAN LED lights never come on, so I assume that this means that there is no activity at all). I've also tried cloning the MAC address, restoring to factory default, updating the routers firmware, and holding the reset button on the modem for 15 seconds, among other things.
Also, something that might be worth noting: While one end is connected to my modem, if I plug the ethernet cord into one of the 4 ethernet ports on the router, the green LED instantly turns on but, as I said before, there's no activity when plugged into the WAN port. My modem is an Arris TM052G (DOCSIS 2.0) provided by my ISP, Time Warner Cable.
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Jun 4, 2011
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Nov 27, 2011
I have cable internet can I use 2wire DSL router/modem with cable internet? I need to do wireless in my house?
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Jan 11, 2013
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Oct 19, 2012
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Aug 28, 2011
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Aug 26, 2012
The detected problem is the connection between my access point, router, or cable modem and the Internet is broken.The network gateway is accessible, but Windows couldn't receive network traffic from the Internet.All other devices (iPad, Xbox, android phone) have no problem connecting to the Internet.Desktop is the only one experiencing the connection issue.
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Jan 31, 2012
My laptop died last week and have been using my husbands, which I hate! We had some issues with computer freezing on some webpages or after being on webpages for awhile (like facebook). Yesterday it froze and I could not get it back on. When he got home he did scan disk (which I also did) and got it working after going into safe mode and doing system restore. He said an update had gotten through and messed things up. Anyhow, after he was on it a few hours last night, we lost connection. I figured the crazy weather was the culprit but it has been off all day. Our router is working and connecting but the adapter is not. Also our home phone says there is no line. We have unplugged everything several times, checked to make sure everything is in the right spots, I have even reset the router and rebooted the adapter. I uninstalled and restalled the adapter also. It is now telling me that "the connection between your access point, router, or cable modem and the Internet is broken". The only lights I have on the adapter are power, battery, DS and now the US light is blinking. The online and link lights are not on.
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Mar 31, 2012
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Jan 18, 2012
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Jan 6, 2012
I have the following devices for our IT Test LAB
1. Cisco 1841 with 2 Fast Ethernet interfaces fa0/0 & fa0/1
2. Cisco 2960-S
3. Speedstream 6200 DSL Modem ( PPOE Connection with Static IP address)
I want to connect to the internet using the current DSL connection we currently have .
LAPTOP --> SWITCH 2960 --> ROUTER 1841 ---> DSL Modem ---> ISP
Troubleshooting 1: Currently from the LAPTOP i am able to ping
1. Switch 2960 Vlan interfaces
2. Router 1841 fa0/0 & fa0/1
BUT can not Ping the DSL Modem LAN interface IP 192.168.2.1 and can not get out to the INTERNET
Troubleshooting 2:currently from the Switch 2960 i can ping
1. All the Vlan interfaces on the Switch 2960
2. Router 1841 fa0/0 & fa0/1 interfaces
3. Laptop A & B
But can NOT ping the DSL modem LAN interface IP 192.168.2.1 and can not get out to the internet
Troubleshooting 3:Currently from the Cisco 1841 router i can ping
1. All the Vlan interfaces on the Switch 2960
2. Router 1841 fa0/0 & fa0/1
3. Laptop A & Laptop B
4. Can Get out to the internet. I am able to ping any internet destinations without any problem
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