UBUNTU 10.04 does not connect to network with patch cord 100' long

kvctechie · 01-21-2011, 03:20 PM

I moved my UBUNTU workstation from basement to second floor and it did not connect to my home network. When moved back to basement level, it connects. Cat5 cable to second floor is 3 time longer than one used to connect in basement, almost 100feet. My Windows XP laptop has no problem in connecting to the network on the second floor using the sane cable that was used with UBUNTU. Any help appreciated.

xeleema · 01-21-2011, 03:26 PM

Greetingz!

1) Get a sheilded cable.
2) Borrow/purchase a cable-tester and see if you have a broken line.
3) This is not a cross-over cable, right?
(You need a straight-thru cable for connecting computer -> Switch/Hub)
4) With your Linux system attached, you cannot ping anything?
5) No kinks, harsh bends in the cable?

Also, please bear in mind the following (from the article above);

Quote:

100BASE-TX and 1000BASE-T were both designed to require a minimum of Category 5 cable and also specify a maximum cable length of 100 meters, though in practice category 5e or above is generally recommended for 1000BASE-T. Furthermore while 10BASE-T is more tolerant of poor wiring such as split pairs, poor terminations and even use of short sections of flat cable, 100BASE-T is less tolerant, and 1000BASE-T is even less so. Since cable testing is often limited to checking if a connection works with Ethernet, running faster speeds over existing cable is often problematic. This problem is made worse by the fact that Ethernet's auto-negotiation takes account only of the capabilities of the end equipment, not of the cable in between.

MS3FGX · 01-21-2011, 03:28 PM

Well then the difference is not necessarily between Windows and Ubuntu, since they aren't running on the same hardware. It could simply be that the network card in the desktop machine is of a lower quality than the laptop.

Are you able to try running a different OS on the desktop machine to see if there is any change? Perhaps one of the live Windows XP discs like BartPE?

kvctechie · 01-22-2011, 08:57 PM

1. I am using cat5e cable
2. I don't think cable is broken because my Windows computer is currently connected to the internet using the same cable.
3. I am using straing cable (connection is through router)
4. Ping did not work

MSFGX may be right. NIC card may be low quqlity. Is there way to reduce the speed cof connection assuming that the card is of low quality?