Cisco Switching/Routing :: Internet Dropping With 861 Router And DPC3010 Cable Modem
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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Feb 8, 2012
my dir-655 rev. A2 router won't connect to the new modem that Charter sent me. I had the scientific Atlanta model dpc2100r2 modem but Charter called and said that they have upgraded my speed for free from 18/2 to 30/4 and that I needed a new docsis 3.0 compatable modem in order to take full advantage of the speed upgrade. I received the modem and connected an activated it according to their instructions. The modem works fine when connected to the PC only but as soon as I connected to the dir 655 the link light went out on the modem and I lost my internet connection. The first step I took was to clone the mac address in Wan section of router. It still did not work. The next step was to turn the modem off, the router off and shutdown the PC. I waited until this morning to reconnect everything. I started the PC, then I started the modem and waited for it to stabilize and finally I restarted the router. I still had no connection. The status page of the router said that the cable was disconnected and that network was disconnected. There was no info to release so I clicked the renew button but nothing happened.
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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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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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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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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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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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Jun 27, 2012
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Jun 30, 2011
have wireless d-link adsl modem router which usually use for adsl connection sharing, but i have a cable internet connection, so my question is can i share my cable internet connection with this router?
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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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Jun 21, 2011
I'm using a 2wire 2701 HG-B (AT&T). Throughout the day (sometimes even 5minutes apart) the DSL light will turn red, the internet will turn off green and 20-40 seconds later they'll both become green again. It's irritating because it sometimes happens so frequently and causes me to close EVERYTHING I have opened in my browser. If I'm on xbox or an online game, it disconnects completely (even if the light is only red for 15 seconds)I have data error stats .tl;dr: 2wire modem giving me problems. DSL light turns red randomly for 20-40 seconds, sometimes up to twice in 5 minutes.
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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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Feb 4, 2011
I have a WAG160 setup to use the one fo the LAN ports as a WAN connection. The issue is every now and again the internet connection drops and it seems it is unable to communicate with the DNS server that is providing the internet connection.
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Feb 15, 2012
I just switched to Cogeco Highspeed ( cable ) and bought a xtreme N gigabit router and it always seems to drop the connection every few hours. The router is set with dynamic IP , I've turned off short GI , it is broadcasting 802.11 N , I've tried changing the channels (currently on ch ,I have 2 wireless phones in the house but they are 20 or more feet from the router it self and also turned off always broadcast DHCP.
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Nov 8, 2011
I purchased this router and a Motorola Surfboard SB5101U for my home network. My current set up at home for devices connected to router are as follows:
2 Macs and 2 iphones - Wireless
2 Directv boxes, 2 blu-ray players and xbox360, Ethernet cabling.
The issue I am having is that everyday at-least 7-8+ times my internet will just stop coming through. I never lose connection to the router it's self. But I cannot load webpages/content on any of my devices. They always show as being connected fine to the router though. I have attempted to call Cox cable, my ISP, to resolve the issue. And I am always told that everything looks fine on their end and that the issue must lie with the connection between the Modem and router. The rep then walks me through a complete reboot of both router & modem and of course, the issue is resolved 100% of the time. I am trying to fix the issue my self to avoid a $50 service call fee from Cox which could still not fix any issues at all. Since I have done some searching and found some advice on making changes to the configuration of the router. But time after time I continue to get the same issue.
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Mar 23, 2012
I can't get a new IP from my ISP when my Cable modem router(EPC3925) is set to router mode, i have tried factory restore, unplugged etc..but still no luck. It changes each time i reset it when i set it to bridged only mode but then i won't be able to connect other devices to it since it doesn't uses DHCP in bridged only mode. It changes back to the IP i had when i set it to router mode. I don't want to change my router settings to bridged only because it would disconnect the other devices in my house. Why my ISP assigns the same IP address when it's set to router mode but assigns different IPs when it's set to bridged only, how is this possible ?
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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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Feb 4, 2013
I am facing with Cisco 3560CG Switch. We have a Cisco WS-C3560CG-8PC-S (Cisco Catalyst 3560-C Switch, 8 GE PoE, 2 dual-purpose uplinks, IP Base image) switch which will be a core switch and the internet link from the ISP is terminated on a Modem. The ISP configured the internet modem and provided the details such as Gateway IP, Subnet Mask, DNS IP address, Usable IP Address Block, to configure the switch, where ew have connacted the Modem. When, I verified the details, there were only 4 IP addresses available under Usable IP address block. Spoke with the ISP and they confirmed that they cannot increase the IP Addresses (some limitation on the Modem) in the pool and we have to do NATing at the switching (Which we can't do, because of IP Base image limitation). About the network, it will be a flat network with only one VLAN which is used for Wireless Guest Access.
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Mar 19, 2012
we using Linksys router for Internet for different vlans now we take 3750 as core switch for another different vlans 10,20 we create v Lans 20,20 also create cpd servers and we need Internet for vlans 10,20 through linksys router how should we configure?
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Jan 6, 2013
I'm switching to cable internet service instead of DSL. My Netgear router will not work with my cable modem; but it works like a charm with my DSL modem. Is it a problem with the router setup? Good thing I still have the DSL service.
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Feb 6, 2012
I'm trying to install a new modem/router (the above) and am having a few problems. The install seems to have gone fine and the firmware has been updated to the latest version. PCs/laptops/PS3s/phones can all connect to the router both wired and wireless. But the modem seems to be dropping its connection to the internet at regular intervals - sometimes every 15mins, other times less. The security log mentions "PPPoE disconnected" after which it reconnects.Has anyone got an idiot proof list of what I should be checking? My old Net gear DG834PN does not have this problem at all so it really has to be the router rather than the line - at least that is my guess.
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Feb 2, 2011
I have DSL setup in my house and I want to know if using a cable modem will work and increase my speed. And will it work with a linksys router
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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 21, 2012
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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)
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Feb 20, 2012
I've been given a used Dell Latitude laptop and need to access the web to register Microsoft Office, which is currently unlicensed on my machine. I took the cable connector from the back of my PC and put it into the port of the Dell, hoping that that would be sufficient. However, it doesn't connect. The gubbins that is displayed for the local area connection status says something about 80 packets sent and only 8 received.
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Oct 19, 2011
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May 5, 2013
Appended below are the following log files:
0. ipconfig /all 1. TechGuy SysInfo Log 2. HijackThis Log 3. attach log from dds.scr (note: this program did not create a file named dds.txt.) 4. ark log from GMER 5. FSS log from Farbar *************************************************************************** ********** 0. ipconfig /all Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:Documents and SettingsRick>ipconfig /all Windows IP
[code]....
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Aug 30, 2011
I'm trying to learn Cisco ASA IOS commands, I have bought myself a 5505 ASA for my home network and plan to implement it. How best to configure it.
I have attached a diagram of how I want my network to look. The internet connection is via the Virgin Media cable modem.
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Mar 19, 2012
Trying to figure out if I have a bad modem or bad wiring leading to the modem.I'm losing connectivity usually in the evening when I'm sure everything is more loaded.he reason I'm concerned about the modem is that when I lose connectivity, I can't access the modem through my browser. It won't respond. This isn't just for a moment. I'll unplug the modem and plug it back in. I can access the modem after that with my browser, but more often than not, I don't regain connectivity. It keeps trying and failiing.its a Motorola SB5100 from 10 years ago. how to seperate bad wiring from a bad modem?
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Jan 9, 2012
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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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