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klkabir · Nov 2, 2009, 01:53 PM

Hello
I have a DSL modem connected to a DLINK wireless router with wired connections on it. I connect a CAT5 cable to one slot on the DLINK and the other end to the PC NIC and it works with 10Mb/full duplex speed. But when I connect to another hub and try to connect to PC and a printer on the Hub, it won't work... I get limited or no connectivity message. I tried a Cisco switch box to do the same, and I get the same problem. Then I tried a Zyxel wireless router with wired slots. And I again get the same problem. I did something simple as connecting only the PC via one of these boxes instead of direct(which works) and it won't work... same no/limited connectivity message. I have tried all sorts of things, like assigning specific IP address on this PC instead of obtain DNS automatically, but it won't work. I am not even trying to connect the printer. I cannot determine if I am not setting something somewhere to get this connection working. It used to work at one time, but now for the life of me can't figure why it won't work esp. when a direct connect to the PC NIC works, but the PC won't connect via a hub, router or switch.

Need help.

TIA
Khan

medic-dan · Nov 2, 2009, 02:41 PM

Are you using a straight or crossover cable to connect the hub and switch? Do you have "uplink" ports on the router or switch?

The rule of thumb is, like devices need a crossover cable.

In your case you need a crossover cable from the router to the hub or you need to use the "uplink" port if it exists. Hubs are dumb devices. Most switches will handle this automatically, but not all, including some Cisco boxes.

You also say you get a 10mb connection? What kind of NIC are you using? I would assume you'd see a 100mb connection unless it is an old card.

klkabir · Nov 2, 2009, 06:37 PM

I am using a straight CAT 5 cable, not crossover, from the DLINK router to the hub uplink or input and then connect a straight cable from one of the 4 outputs to the PC. This set up with exactly these H/W components and PC used to work fine. It was disconnected during some building renovation for 2 months or so. I'd think the NIC should work at 100mb from the DLINK router to the PC, but for some reason it shows limited or no connectivity, so with trial and error I discovered the 10mb FD works. For reasons I don't know yet, Auto Detect of speed does not work. The Cisco switch does not have any specific uplink port, but I was told if you plug an uplink into one port, the unit automatically detects that and makes the others downlinks. The 3rd was a Zyxel wireless router with 4 wired connection ports and one uplink.
What puzzles me is that the direct connection to the PC from the DLINK router works but it won't work with hub/switch/router. Does it have anything to do with setting up Internet connection sharing or something. The PC is a Dell 2-3 years old, and is running Win XP.
Thanks very much for tips and suggestions.

medic-dan · Nov 3, 2009, 09:22 PM

OK, straight from DLINK to hub uplink, that should be good. Then another straight from the hub to the Cisco switch, which is supposed to sense.

You have nothing in the port next to the uplink on the DLINK do you? You don't give a model, but some have 5 ports but you can really only use 4 as two of them are connected but the wiring reversed.

Do you get link lights on the switch and hub?

Something is odd with your NIC. Did you just add the ICS to it or was it there when it worked? Did it work before/after SP3? What model hub do you have? Can it handle 100 mbit? Some older ones only ran at 10mb.

Make sure all your components are 10/100mb autosensing. You can't mix a fixed 10mb and a fixed 100mb.

I guess model number would help. This is odd.