SB6121 - New Modem Not Connecting To Internet
Oct 1, 2011
I have a Windows 7 computer with Comcast HSI. It's a very fast computer, but the modem was really outdated. So was the router. So, we got a brand new Cisco N+ Router and a Motorola SURFboard SB6121 modem with DOCSIS 3.0 and IPv6. However, when plugged in, the new modem will not consistenly connect to the internet. We called Comcast and they tried to send an activation code to the modem with it connected to the computer directly, but it was intermittently going online, then offline, then back online, then offline. We exchanged the modem for an identical one, but it's doing the same thing, so the modem can't be at fault here. Comcast tried to tell us that something was wrong with our coaxial cable, but our old modem - a Motorola SURFboard 4100 running DOCSIS 1.1 - was working just fine with the same cable. Another technological "improvement" has failed me.
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Apr 22, 2012
I have a 192.168.1.xxx network connected to Verizon FIOS via Actiontec MOCA / router. I also have a 192.168.15.xxx network connected to Comcast via Motorola VT2442 router (used for Vonage) and a Motorola SB6121 cable modem.
Each network has it's own gigabit switch connected to each router. The two networks are physically separated but switches and routers are physically side by side.
What is the best configuration to allow devices on 192.168.1.xxx network to communicate with devices on the 192.168.15.xxx network (share printers, NAS, etc), but still have each network served by it's respective ISP, and each device still get it's dhcp, dns, gateway, etc from each respective router?
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Dec 22, 2012
My cable provider has installed a separate RCA DHG536 modem for my VoIP phone service alongside my SB5120 modem, and charges me $7 a month modem rental. I am upgrading the SB5120 to a DOC 3.0 modem and wonder if I can abandon the DHG536 modem?
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Mar 17, 2011
I am having trouble connecting to the internet with my windows 98se and DSL EQ660 RADSL 660series modem/router. Whats the procedure to connect to the internet with windows 98se using a DSL modem? Which if any items used for the connections do i need like (clients for microsoft networks,QoS Packet schedular,TCP/IP0)?
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Jun 25, 2011
I just bought a D-Link DIR-615 N300 wireless router to use for printing between my laptop and HP4500 wireless printer. During setup using Verizon Mobile USB 760 modem for internet connection---it's not working--? Or is the only way to utilize is to have a DSL or Cable modem?
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Jun 23, 2012
Trying to connect one computer to the internet using a USB Verizon Pantech modem and at the same time connect to printer wirelessly through a Linksys router. We are able to connect to one or the other and can print when connected to the home network or we can surf when connected to the Pantech. We can connect to both networks at the same time, but when we do we can neither print or surf.. It cannot find the printer and does not access the internet at all. Is it possible to do this without buying additional hardware
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Dec 10, 2012
I am connecting to internet via motorola modem which gives me approx 6 Mbps download speed when I test it with both speedtest.net and speakeasy.net. Any device that I use connected wirelessly to my Belkin N300 router only acheives about 1.3 MBps of download speed. Is this just the way it is or could I have a router configuration issue or something else?
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Jun 27, 2012
I'm using comcast broadband, motorola SB6121 modem and a edimax br-6424n wireless router.I set up everything myself and it worked great for 3 weeks.Usually, I have 2 laptops connected and iPad.[CODE]
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Nov 19, 2011
I can't seem to get DIR-655 to communicate with Motorola SB6121 cable modem. Don't know if it has anything to do with the old firmware 1.21?? Should I update the firmware? If so, which version?
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Jun 23, 2013
Recently changed modems because of ongoing issues with Mediacom's loaner. I now have a Motorolla SB6121 and use an Airport Extreme router. I've used the Dell in the passed with the apple router, and several different modems and all was fine... but for some reason this hookup is not working for my Dell Studio. It sees the network, but will not connect to it. I did nothing different other than plug everything in. No other computer has an issue with this connection - only the Dell.
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Aug 18, 2012
My Motorola SB6121 DOCSIS 3 modem is connected to a Medialink n-band router. Sometime in the morning (usually between 7am and 9am, the router loses the ability to see the modem. I can access the router's control panel, and I see 0.0.0.0 for WAN IP, Subnet Mask, and Gateway. Primary and Secondary DNS server are both blank. Connection Mode is Dynamic IP.I lose the ability to access the modem's control panel directly (192.168.100.1), even though the PC I use is hardwired to the router. So, I unplug the modem, unplug the router, wait, plug in the modem, plug in the router, and everything works again.I've had more than twelve service calls. Every Charter tech looks at the line, puts in boosters, takes out boosters, replaces splitters, and seems to only look at signal. I've BEGGED Charter to let me speak to an engineer, because my suspicion is that it's something to do with the DHCP server.
I did, by the way, replace EVERYTHING.I have had 5 different modems...same problem. I have had 5 different routers...same problem, including a modem/router combo.I've tried different brands, too.I've disconnected all wifi devices from the router, and rebuilt my PC's operating system. I've even unplugged the refrigerator, because one Charter tech claimed it was "upstream noise."I've been online only a few times when the system actually goes down. What I notice in the router logs is this: [code] So at 9:34, no ranging response - T3 timeout, followed by Unicast Ranging Received Abort Response;
then the Cable Modem Reboot due to T4 timeout, and the system time goes to 1/1/1970 at midnight. No ToD.
The last piece of information: Charter installed a second modem as a "test." That was originally in the same room. A month ago they did another line from the box directly to the test modem to skip the splitter on the house.That modem shows the same problems, EXCEPT -- not perfectly in sync. I might see the same error, but the time will be a few minutes and seconds off. And sometimes I'll see the errors, but the modem won't go down.Sometimes the first modem goes down, sometimes the second. I'm accustomed to a router "healing" itself when the modem goes down.It might be off for a bit, but then will re-establish. This Medialink doesn't do that. It forces a physical restart every day. There are other outages too, and all I get from Charter is "the signal strength is good."
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Dec 14, 2012
Swapping cable modem SB5101 that has been working for years for newer one SB6121. F5D8235-4 v2000 router has been working with SB5101 for years. When I connect using same cable/etc. Router cannot get DNS/IP from ISP (Comcast). Cable modem works directly connected to my laptop. Switched back to SB5101 and works again flawlessly. FW on router is 2.01.07. Had comcast tech support as well as comcast tech onsite- no resolution. I did activate new modem thru ISP (even with them here doing it).
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Jun 4, 2012
When I plug my desktop into my wireless router I have slow internet but when I plug directly into the modem I have no connection at all. It says "cannot connect to primary DNS server". I'm using a Motorola SURBOARD SB6121 and a NETGEAR WPN824V2 Wireless Router. When I do ipconig /all this is what I get:
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Aug 11, 2011
Two days ago we received our new phone land line from Mediacom. We already had internet service from them so we decided to get a phone line. When they came over two days ago, we received a new modem, RCA DHG535-2. The issue we are experiencing is that the modem is not connecting to our rt n-16 ASUS wireless router. The modem works fine without the router but we need it for school work. The troubleshooter says "DNS is not available".A few things i tried was to unplug everything and reconnect them back from the modem to the computer.It usually works when i had trouble in the past but it seems nothing is working.
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Jul 21, 2011
I have a wireless modem. Its main connections are power, and phone line. Since its a wireless modem it is not connected to my PC through wire. i have a Data card USB which is plugged in my PC. The wireless modem senses this Data card and my internet was working normally. I live in New-Zealand and I was having a Telstra Clear connection with their modem and Data card. Since it was acquired by Telecom, the internet provider had given me this new wireless modem but the Data card remains the same.Now this new wireless modem is not connecting. But the laptops are getting connected through WiFi. Since my PC has no WiFi, it uses this data card. My PC is not getting connected to the internet. I tried plugging in the USB Data card in and out, updating the drivers and stuff.I want my PC to get connected to the internet.
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Jan 19, 2011
i have 2 laptops and would like to connect them to one cable modem. 1 laptop is connected to the modem by ethernet cable..how can i connect the other laptop sharing the same modem?
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Aug 23, 2011
I HAVE AN I BALL BATON iB lr6111a and i need to connect the same to a router but it has only one rj45 port since the router dont have a modem how can i connect it to a modem with only one port.
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Jul 7, 2011
I just had charter install a wireless cable modem into my house and it was put in my study. however, i would now like to get my xbox 360 running as well as the internet for my blue-ray player and tv. So i bought a wireless router.The modem from charter is called: Ubee wireless cable modem (from charter)The wireless router purchases is: Netgear N300 wireless router (wnr2000v3) I am trying to connect them wirelessly. Like I said above, my modem is in the study and the router is about 30 feet away in the living room area.
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Feb 21, 2011
our client are using PSTN (modem) and is dialing up to our ftp box which is using ISDN (TA). according to them, they not facing any problem to dial up to other vendor which is using the same network infra (PSTN to ISDN). but, unfortunately in wont happen in my case which they (client) keep receiving the busy tone when they dialing to our ISDN no. i've set in our TA to accept both digital and analog calls and i'm using the DSS1 protocol which been told by our line provider.
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Oct 25, 2012
The network card in my PC supports 1Gbit ethernet, my 2TB NAS also supports 1Gbit ethernet, however both of these are currently run through a 100Mbit cable modem/router thus reducing the connection speed. I was wondering if I purchased a 1Gbit switch and connected all my devices directly into that, then connected it into the cable modem, would the PC communicate with the NAS directly via the switch or would it go through the cable modem?
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Jun 13, 2011
My aunt's connection was working fine until the other night. Apparently a storm we had knocked out their power and the next day they could not get on the internet. They were on the phone with tech support from their service provider and "had them reset the modem." This is basically all I could get as they are not very tech oriented.
From what I gathered: The modem and the router are not communicating with each other. The modem is a Motorola ADSL single port Ethernet modem, and the router is a Netgear Rangemax wireless router WPN824 v3 with the modem connected via the uplink port on the router. Whenever the ethernet cable to the PC is plugged directly into the modem, there is a connection. I exhausted my entire networking knowledge trying to figure out what could be causing this.
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Jan 31, 2013
that possible to connect one telephone line with two modem (both are wireles)if possible then how?
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Jan 10, 2013
I have two wireless modem/routers - a Ugo Mach5 CN458 and a Swift 4G - in two branches of my company that are distance apart and i want to connect them together so that they can be on the same network and workers in both branches can communicate and share files.
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Mar 19, 2011
I am trying to connect an xbox 360 to my wireless modem.
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Apr 23, 2012
Currently I have 2 different modem running in my working area which is modem A and modem B. Whenever user from Modem A(192.168.0.1) or Modem B(192.168.0.10) would like to print or scan something using the shared printer, I need to manually plug the cable into either Modem A or Modem B depends on the network the user are currently using.How I do previously is only set DHCP on Modem A and disable DHCP for modem B so that Modem B will share DHCP assigned by Modem A. Both modems connect to the same Switch with the printer cable so both network user can use it together.But the problem now is I have to enable DHCP for both modems and causing the previously method can't be use anymore. So is there any other way that I can link both Modem A and Modem B with each assign different DHCP to link with 1
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Jul 26, 2011
Ambit U10C018 send light not working. All other lights indicate proper functions. Usb not in use or connected. Enet, power, ready, receiving and sync all appear to be working properly. Have rebooted both modem and computer countless times, replaced Ethernet card (DFE-530TX+(Rev f), checked cables, all appear normal. Suddenlink service, cable guy didn't locate problem (didn't try very hard either).
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Apr 26, 2012
How to connect 2 cisco modem in 1 3com router.
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Feb 8, 2011
What I learned was it was bad to connect directly to the modem because you are left open to the internet. Currently my friend just got the internet and I told them to buy a router but they did not, and just have it directly connected to the modem. Is this fine, because they only have one computer, and it works fine for now, but wouldn't this be prone for attack?
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Feb 15, 2011
I've been trying to connect my laptop directly to my Arris modem with an ethernet cable to get on the internet, but for some reason every time I do I have "limited access" and can't get on the internet. I can only seem to get my laptop on the internet while the wireless router is connected to the modem and then either connecting wirelessly or by connecting my laptop to the wireless router with an ethernet cable.I want to connect to the internet without my wireless router, because someone was hacking our router and was apparently doing illegal downloads. We got a cease and desist letter that said our internet will be terminated if it happens again, so I want to connect to the internet without any wireless connections being set up.
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Nov 22, 2012
I have a problem connecting wifi router(airlive wt-2000r) to my ADSL modem(webstar epc2203ed2.0) using utp patch cable. When my PC is connected straight to the ADSL modem everything works like charm. But when I connect modem with wan port on the router and router with my PC I get no internet access. The network shows as unidentified network and win7 troubleshooter says: Default gateway not available. Connecting them two devices seems pretty simple and I dont think I am doing anything wrong so what could be the problem?
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Nov 6, 2012
I am trying to connect my modem with router (ASUS WL-500gP V2) but don't have any luck. Internet is not working with router.
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Jul 26, 2012
I have a wired ADSL modem+router, and also a Linksys WRT54G2 V1 router. How do I connect them such that I get a working wifi available?
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Feb 5, 2013
I'm sure that the modem/router is bridged which I think it means that it is sent to pass through the port number requests. What I did was go into my Linksys router, setup the port I want to forward to my 3389 (RDP port on the specific machine). Let's say port 45000. In the past, before Windstream took over and I had DSL with a local Telco, I would just enter my IP address and port number and I was in to the machine. Example: 171.234.54.191:45000 That would be the IP address of my modem (which just passed though the requests) to the router. Now when I do the same thing I just get an error message that looks like this: It seems that the modem/router is not passing though the request to the router. This is why I didn't want their new router/modem which the HAVE to charge $120 for worse quality machine than what I already had.
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