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Modem+Router for 2 computers; only one gets the net!Follow

#1 Sep 10 2008 at 10:11 PM Rating: Good
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Just renewed my Comcast Cable internet (I've been on DSL). I have an Arris Model TM502G modem connected to a 3Com 3C16700 8 way router with a CAT 5 cable. The router then has 2 CAT 5s running to a home-made desktop and a Del Inspiron 8600 laptop. Both run Windows XP, the laptop has Service Pack 3, the Desktop is still on service Pack 2 (I'll D/L 3 tomorrow).

No matter what I do I can only get the net to work on one machine at a time. I can get either machine to work with a CAT 5 directly from the Modem to the machine, or one at a time with everything connected. I am certain all the cables and ethernet cards are working in each machine. Card drivers are also fine as far as I can tell.

I have tried to cycle all the hardware in order several times, with or without batteries in it. I have tried ipconfig /release and /renew on the laptop several times. It always tells me it can't communicate with the DHCP server. I've tried turning off my Firewall. I have not tried to clone or force IPs at all, but I know both computers are properly set to "Obtain an IP address automatically" in the TCP/IP options for XP's network connections.

I am out of ideas and Comcast says they can't give me any advice b/c they didn't sell me the router...any advise tech gods?
#2 Sep 10 2008 at 11:26 PM Rating: Good
After looking at the manual for this router my only suggestion is to check the Uplink/normal switch on the back. Looks like you want it set on Normal.
#3 Sep 11 2008 at 1:42 PM Rating: Good
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1,368 posts
When said button is on normal- Port 8 shows no connection to the modem at all. I have to set it on uplink to get anywhere. When it is on uplink, al three CAT5 cables show connectivity....

Talked further with Comcast, the tech said that I needed to get the modem can only assign one IP. So... she suggested getting the modem to assign one IP to the router and the router to assign separate IPs to the computers. I'm at aloss for how to accomplish this, and the statement makes little sense, even with my limited TCP/IP knowledge.
#4 Sep 11 2008 at 2:31 PM Rating: Good
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7,861 posts
I had something typed up to help, and after looking at that documentation, I don't think I can. It appears that the network "in" connection is a coaxial port. It also appears, from what little I've read so far, that it is a network "hub", and not a router. You would probably be better off going out and buying a new router. Linksys has good equipment, and they're reasonably priced.
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#5 Sep 30 2008 at 5:15 AM Rating: Good
You need a router. You're using a switch now, which is nothing more then a "splitter" for cables. Your comcast modem can only distribute 1 IP, so you need a device that can do multiple ones. Linksys is good stuff indeed
#6 Sep 30 2008 at 6:04 AM Rating: Decent
Yup when I typed in your model number with quotations around it, it gave me the link to the exact thing.

http://www.shopping.com/xPO--3Com-OfficeConnect-8-TPO-3C16700

This is a switch not a router. I honestly don't know why people sell those to individuals anymore. All they are useful for is setting up home networks, which your router can do as well.

I will have to agree with bertuz here, linksys make probably the best routers for gaming. The firmware on them allows for all kinds of customization possibilities.

One side note. When you mentioned home built PC, a small warning bell went off in my mind. If you have a cracked version of XP (which most people do lol) and both computers are using the same serial number, then you will more than likely have the same troubles when you get a router. If you have 2 PCs on the same network, with the same serial code for XP, it will give you errors.

If you have legit versions of XP, then ignore what I just said lol.
#7 Sep 30 2008 at 9:43 AM Rating: Good
I've found that most people with cracked XP actually had an OEM installed with a unique serial number, and just installed a clean version they burned off someone. A bit of yelling with M$ will make them unlock the code if you get tripped up during installation.

(Not me in this most recently installation; my box came with Vista and I had to grab an XP disk for it. Yuck.)
#8 Oct 01 2008 at 7:59 AM Rating: Decent
Or you can use one of the other serials that the torrent comes with lol. But...im not going to go any farther into that one for the obvious reasons.
#9 Oct 01 2008 at 8:02 AM Rating: Good
lightningcount wrote:

I will have to agree with bertuz here, linksys make probably the best routers for gaming. The firmware on them allows for all kinds of customization possibilities.


It's my employer :)

A simple WRT54G will suit your needs, and it'll set you back like 40$? Not sure though, I live in the Netherlands.
Another nice thing about those is the customisation that is possible, though i'm not too sure if you should use third party firmware if you ask these kind of questions (don't mean to belittle you, it's just that most of the functions you "unlock" are for more advanced users)
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