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Old 06-03-2007, 01:33 PM   #1
hacker supreme
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An Odd network issue


I really didn't know where to put this but here seemed to be the best place. I am terribly sorry for the exceedingly long post

I have been having issues with my Debian box randomly not being able to connect to the net.
I originally thought it was a DNS problem, but it seems to be deeper than that.

When this issue arises, Firefox can't find the sites I try to connect to, I can't ping websites, e.g. ping google.com

What makes it worse is the fact that I can't ping local IP addresses, I just get 'destination host unreachable'.
But this only affects the Debian box (not the slow as treacle through a tuba Windows XP box from which I'm posting this.)

I then thought it was a mis-configuration problem, but it happens no matter whether I set eth0 to DHCP or manually configure it.

I have checked the cables and I have checked all the settings on the web-min interface of the router.
What makes me think this is a hardware issue is the fact that even when the box is shut down the status light corresponding to the box shows data transfer continuously.
EDIT: Oh, and Ethereal on the Windows box shows no data transfer from the *nix box.

Switching the plugs to different sockets doesn't help, and this problem is completely random. It also affects LiveCDs, not just the normal Debian I boot.

Last edited by hacker supreme; 06-03-2007 at 01:35 PM.
 
Old 06-03-2007, 03:48 PM   #2
TigerOC
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Sounds like a failing ethernet card. When the network goes down again do as root;

ifconfig

this should list details of all network connections. If the card is not showing up on the report as root do;

ifup ethX where X is the ethernet card number.

then try ifconfig again. If you still have no luck replace the card.
 
Old 06-03-2007, 05:05 PM   #3
hacker supreme
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Temporarily fixed.

Turns out that the router/ADSL modem is a bit dodgy.
I dug out my network switch, plugged all the PCs into that, then connected this to the router, and everything works fine now.

If I could afford it, I'd get a new Router/ADSL modem, to replace this free one from our ISP, but I can't so I won't.

BTW, TigerOC, it's actually the Ethernet interface built on to the motherboard.
 
Old 06-03-2007, 11:19 PM   #4
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You have a combo router/modem?
 
Old 06-04-2007, 11:04 AM   #5
hacker supreme
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newbe45: yes, it was provided by our ISP.
 
Old 06-04-2007, 05:41 PM   #6
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Yeah, sounds like a bad port. Did you try contacting the ISP, usually the customer rents the modem and they will replace broken equipment without a hassle.
 
Old 06-05-2007, 10:43 AM   #7
hacker supreme
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You know, it's funny. It only happens when my box is connected directly to the router.
But not when it's connected through the switch.
And this happens on each and every port of the router. Ah well...

I'm going to have to see if I can have this router replaced. (If I can be bothered. It's still working so f... >>>CARRIER DROPPED<<<
 
  


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