Question about RCA Thomson Digital Cable Modem (DCM305R)

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I have a DHG536C Cable modem from Comcast. I am using a Linksys Switch, EZS88W, and the modem can see one computer but nothing eles, what is wrong?

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Have you connected all computers, then switched off the switch and modem. now switch off your computers.
If you then power everything up, it should detect the computers, and assign them the correct IP addresses.
If your still having problems, you may need to assign static ip addresses (google for instructions for your computers/switch)

Posted on Sep 14, 2010

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I have a DHG536C Cable modem from Comcast Does is have an internal router so I can use a simple Eithernet switch or hup to connect 2 computers or do I need to use an external router?


The DHG536C is a pure cable modem. You will have to purchase a router to establish a network with the two computers. Alternatively you could connect one PC to the modem and have a peer to peer LAN network between the two pcs. The PC connected to the cable modem will need to be on all the time. You will need a wireless or a LAN card for each of the 2 computers.

If you wnat to buy a separate router you can select something from this site.

Dec 06, 2010 | RCA Thomson Digital Cable Modem (DCM305R)

2 Answers

I HAVE A NEW HP DESKTOP AND AN OLD LINKSSY WIRELESS G


Hi Vivian,

Chweck you cables and where they are conencted.

You will need to make sure that the Comcast modem is providing internet, you can do this by connecting your laptop to it using ethernet directly if it connects to the internet, that will be a good thing.

From your comcast Modem, the ethernet Cable should go to the linksys where it says "WAN". this should give you an internet connection and make your comcast modem communicate with your linksys Router.







Jul 22, 2010 | Linksys Wireless-G Broadband Router

1 Answer

Set up difficulties


You sure can. Start w/ the Comcast modem as long as it is NOT a USB type and hooks using a CAT-5 cable (regular network cable). Hook the comcast modem to the WAN port of the wireless router. On the back of the wireless router use the normal 1-4 extra LAN ports to hook other computers or the SD208 switch to it and other computers from there.

Word of advise if using Wireless Router, be sure to read manual and set a KEY for your network to secure it from unwanted outside use.

Apr 03, 2010 | Linksys SD208 8-Port Ethernet Switch...

1 Answer

DHG535-2 and LAN switch issue


It sounds like the LInksys that they replaced was also a router. A router will route packets to multiple pc's that are connected to it. The cable modem just sees the router as 1 pc. When you use a switch, the cable modem will see all of your PC's. and Comcast just allows 1 pc. You will need to buy a router to use more than 1 PC which will be cheaper than using Comcasts Home Networking service which will network up to 4 pcs

May 29, 2009 | RCA Thomson Digital Cable Modem (DCM305R)

1 Answer

Want to have wireless with my Limksys Sr2016 switch


Go to: www.speedtest.net with a laptop on your network.

Find your speed. now repeat on same laptop plugged directly into the cable madem.

Do the settingsa change much?

If so, your network is at fault. If not, Comcast is lying to you.

May 12, 2009 | Linksys SR2016 16x1000 Mbps Networking...

1 Answer

Internet connection problems


Sorry but that seems to be a pretty convoluted explanation. Here is how it should go.
Vonage unit connected to phone line(s) and cable modem. Linksys connected to Vonage box. Computers connected to Linksys.
Ethernet has a length limitation of about 300 feet before you need another switch (hub) or a repeater. Does your wire length exceed this?

Apr 20, 2009 | Linksys WRT54GX2 Wireless-G Broadband...

1 Answer

Connection


Hi Susie
With related to your particular issue it seems like that your broadband modem is not configured for the router. There are basically 2 types of connection. DSL and Cable modem. Verizon, ATT are DSL and comcast other providers give you a normal cable broadband connection. If its comcast make sure the cable from the comcast modem is going to the internet port in the linksys router and also make sure that there is a system connection the linksys router and the cable from the system goes to any of LAN 1, 2, 3 and 4 ports. Then reset your cable modem by using a pin and inserting to the reset hole in the modem. You could use the same step to reset your linksys router as well .If its a verizon or dsl connection you need to put normally your username and password in the router page. here is the link to how to configure linksys for your internet modem.
Here is a video as well on it?
http://in.youtube.com/watch?v=vSAXMO7aNzg

http://tinyurl.com/5tqqhl


Also post the linksys router model. your ISP modem model number and also information on how many systems are wired to the router and wireless and let me know if you need more help.

Thank you
Rakesh
Dell Laptop Expert

Jan 09, 2009 | Linksys Wireless-G Broadband Router

1 Answer

Arimex comcast router won't talk to belkin wireless g plus mimo router


Comcast has a little known "trick" that they use when setting up users. Here's how it works:

When Comcast first comes to setup your new cable modem service, they insist on connecting it to your computer and "testing" it. Most people think nothing of it, and that it's good customer service ...truth be told, what they are doing is attaching your computer's MAC address to that cable modem, so that you cannot create a wireless network. This is because they want you to pay them $150 to do this for you.

In this situation, since the modem is a modem/wireless router in one, my guess is that the MAC address on your machine now does not match the MAC address on the new router, which is what Comcast has stored in their database(s).

Try this: on your computer (while connected to the modem), perform a release on your IP address (start, run, cmd, then type "ipconfig /release"). Disconnect the ethernet cable from the computer. Turn computer off completely. Hold down the reset button on the cable modem until it performs a reset. Once it's back up and running, boot up your computer with the cable back in the ethernet port.

The cable modem should assign a new address to your computer. However, that may or may not work ...this is an easy workaround with a Linksys router, but not necessarily with the all-in-one devices.

Worst case scenario: contact Comcast and notify them that the new modem is not recognizing your computer's MAC address and that it needs to be updated in their system. They will scan your computer (through the telnet interface on your modem) and get your computer's MAC address, then (hopefully) make the necessary changes on their end.

After that, everything should work flawlessly. If not, insist on a Comcast tech to "fix" the service that you are paying for.

Good luck - hope this helps :)

Sep 29, 2008 | Belkin Wireless G Plus MIMO (F5D9230-4)...

2 Answers

Connecting to internet


Ok, cable (coax) comes in from wall and attaches to modem. Ethernet cable goes from modem to WAN Port of router. You may have to reboot both devices to ensure that your modem (internet service provider) assigns IP address to your router. If PC is close enough, attach new ethernet cable from one of the 4 ports on your router down to your PC's ethernet adapter. (where your modem used to plug into). Router will now assign an IP address to your PC and you should be able to access the www.

Good Luck and let me know if you have any more questions.

Jul 13, 2008 | Linksys Wireless-G Broadband Router

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