help me - Networking

Compac / 3702tu
January 9, 2009 at 15:11:36
Specs: Windows Vista Basic Home, xyz
I have laptop that i hardwire to a dsl modem. I recently changed location and used up the entire ethernet cable. So one end of it connects to the modem and the other end to the RJ45 on the laptop. I noticed that the network activity leds ( green and orange ) will come and go as though a loose connection. I went to where we had the modem and unplugged the cable from my desktop and plugged it into my system and it works fine. Initially when i was using my cable that is before i moved, the internet worked fine.
We have a dsl modem that is connected to a hub and we have two systems connected to the hub, mine and another desktop as explained above.

Any suggestions ?


See More: help me - Networking

Report •


#1
January 9, 2009 at 16:04:49
Your modem only gives you one ip address. You connected two devices to it with a hub.

Only one device can work at a time. If you want your laptop to work keep the pc off. Visa versa when you wnat the pc to work.

Consider replacing the hub with a router so you won't have this issue.


Report •

#2
January 9, 2009 at 17:05:19
Hi,

Thanks for replying.

What we have is an extn to the lan ports that lets us use more computers. Maybe i used the wrong word hub, would it be called a switch ? It is just like a router only it does not allocate ip addresses ie it just provides extra lan ports. So the ethernet cable from the dsl goes to the internet port on the switch/hub and then u have about 8 more lan ports ( maybe 7 ). In the past both systems worked at the same time until i shifted. I used the same cable initially but now the leds on the nic card of my laptop will come on for a second then switch off and vice versa.


Report •

#3
January 10, 2009 at 03:27:23
>> wrong word hub, would it be called a switch ? <<

Same principle outlined by Wanderer applies. The term hub and switch are often used interchangeably as neither supply IP addresses. You need a router with built in DHCP which will supply IP addresses.

How long is this cable? There is a 100 meter limit on Ethernet cable. You can get problems before you get to this limit if there is a lot of electrical noise around.

The lights constantly flashing on and off does suggest a cable problem.

Stuart


Report •

Related Solutions

#4
January 10, 2009 at 07:31:57
If you are really using a hub where the modem and the computers are connected to, you can dial up with more than one computer at a time.

If it is a switch, it won't work.
I'm using even this configuration (modem connected to a HUB, not a switch) and dial in through the Internet with 2 computers and it works fine.


Report •

#5
January 10, 2009 at 09:34:55
You are using something more than a hub then as with just a hub both computers would have the same IP address which is just not possible. Unless you have two public IP addresses.

Stuart


Report •

#6
January 10, 2009 at 10:37:28
Hi,

You guys are all making valid points. However the modem has a default gateway of 192.168.x.x and it maybe possible that is also works a dhcp server ie it can allocate more than one ip address. I dont remember the ip address of my laptop and the desktop but iam quite sure that they are different since both systems have connected at the same time. Infact Mcafee has also alerted me about another system in the network ie the desktop. Also if it helps, the modem has a usb port also and we have connected 2 systems using the usb and the lan when we didnt have the hub. Iam thinking it may have something to do with the connectors at the ends of the cable ( less than 100 metres )that were changed and may not have been installed correctly.


Report •

#7
January 10, 2009 at 10:57:19
If the default address is 192.168.xx.xx then there is certainly and DHCP server involved as well as Network Address Translation as 192.168.xx.xx is a Class C private address.

What you have a is modem with a built in router, albeit one with only one Ethernet port and one USB port, but a router nevertheless. I had a similar Modem/Router, a Zoom X4, and if wanted to connect more than one computer via Ethernet then I needed a hub or a switch. A modem by itself does not provide DHCP or NAT.

This is were providing the model number of the equipment in question helps as it would make it easier to determine exactly what is happening.

Stuart


Report •

#8
January 11, 2009 at 16:23:48
Guys, issue resolved. The plugs on both ends of the cable were crimped incorrectly and hence there was no juice going into the nic card. Those were changed and the net is up and running.

Cheers !


Report •


Ask Question