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Network Help

S

Synnergy

Weaksauce
Joined
Sep 7, 2003
Messages
116
Help this definentlyseemed like the place to post this, so here goes. :D

Well a few days ago my network worked just fine, but recently it hasnt been. We have 3 computers on our network and all of them but mine are working perfectly. Like I said, mine was working a few days ago as well, but it isnt anymore.

The three computers are connected through a linksys hub which connects to our cable modem. Ive also tried plugging directly into the modem, but that didnt even work. I tried deleting and reinstalling the network adapters but that didnt work either. I have no idea what I did to ruin my computers connection, so someone please help me! If you need anymore information about my computer/setup ill be happy to provide it. Thanks!
 
You say they are connected to a hub? is there a router/nat/gateway box as well? or simple a hub?

If its just a hub, it might be that you only have 1 IP alloted from your ISP, so it will deny access from any other computers. If there is a router, then the probably is likely with it, and it might need to be reconfigured.
 
It is a simple Linksys hub, with 3 computers connected to it. All of the computers on it work except mine.. :(
 
Also, the other computers on the network can "see" my computer. And I went to network connections and checked on the adapter, it is sending packets but not receiving any. I hope that helps you guys.
 
We need more information,

From what ive gathered, its likely to be a workgroup based simple network, so check all computers are on the same workgroup.

Im a bit confused about how your shareing the internet here. You says its a 4 port hub. with 3 computers attached, is one of these computers attched to the modem and shareing the internet? or is the modem plugged into the hub?

Give us some more infor, and a simple diagram would work wonders too!

Thanks
 
Ok ill try and explain.

Cable Modem -----> 5 Port Linksys Hub -----> 3 Computers


So the cable modem is plugged into the hub, and all the computers are plugged into that hub.
 
Linksys Model NH1005 Version 2.0

But I dont think the hub is the problem, ive trieding connecting directly to the modem, and ive tried a Belkin router, neither worked
 
How many IPs are you allowed to have from your ISP? Most Cable modem ISPs program the cable modem so after "x" amount of computers are detected, they will not give out any more DHCP addresses.

If your only allowed one or two, I would suggest getting a router/firewall and put all of your systems behind it. Otherwise unless you know how to *securely* lock down your systems and network, others on the internet may have access to your computers or shared files.

BTW, whenever you want to connect a single computer or router to the cable modem, be sure to power cycle the modem to clear out the MAC addresses that have already been detected.
 
Im not exactly sure how many IP-addresses we are allowed, but it used to work with 3 computers. We have roadrunner, you know beep-beep. Something else that might help you guys find the problem is that my connection says Invalid Address and my IP and subnet mask both show up as 0.0.0.0. Please try and help, I dont know what to do.
 
To troubleshoot the problem try the following:

1. Disconnect all computers from the hub
2. Power Cycle the cable modem
3. Connect *one* computer and test for internet connection

Try each computer by itself and let us know if you still have problems with just that one system.

If your ISP has caught on that you are using more IPs than allocated, then you will not get any additional IP addresses beyond your allotment hence one or more of your computers will not work on the network or for the internet.
 
Wow, I didnt think there would be any way to fix this, but I did what you said SJ and it worked! Im on the culprit computer right now. Now I have a few more questions.

Is there a way I can tell how many IP's I am allowed?

How did they find out I was using too many?

If I switch to a router from this hub, will they still be able to tell?

And a sort of off base question, what are the differences between a router and a hub?

Once again thanks again SJ, you made my day! :)
 
ISP's typically program the cable modems to only allocate a certain number of IPs to your connected computers. You will need to contact them to find out how many IPs you are assigned. Alternatively, try browsing to 192.168.100.1 and see if a configuration page comes up, somewhere in there you may see something listed as to how many IPs you are allowed.

A consumer grade router would only use one IP, but allow you to have up to 253 computers connected thru it. An ISP cannot *easily* tell how many computers you have hooked up to it, but typically they are not concerned when you are only using one of their public IP addresses.
 
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