[BC] IP Weirdness

[Mark W. Croom]

I've got a machine that's doing the same thing, but it's not mission critical
so I turned it off until I can get back to that station. I'm thinking it's
going to be the LAN card because internet access would slow to a crawl while
the DHCP server in the router was busy dealing with this machine that was
popping on and off the net. No other machines were showing the connection
problem, but their internet access got really spotty while this was going on.
Once I shut the thing off operation returned to normal on all the other boxes.

The idea of turning off the NoIP machine is a good idea if you can. One night
with it off would tell you a lot, I suspect. 

It is not out of the question that the power supply might be getting bad on
the switch, or some other switch issue is happening. More likely there is a
single LAN interface card on one of the machines (maybe even one port of the
router) that is bringing the whole thing to its knees.

Good luck.

Mark
MN


---------- Original Message -----------
From: "Jason R." <jyrussell at academicplanet.com>
To: "\(BC\) Bdct Mailing List" <broadcast at radiolists.net>
Sent: Mon, 26 May 2008 10:15:09 -0500
Subject: [BC] IP Weirdness

> Here's an IP oddity I saw for the first time  -
> 
> (sorry for the length, but I'm trying to accurately describe the 
> problem).
> 
>   Have you ever seen a machine try to ping a different address than 
> what you put in...?
> 
>    I have four XP Pro machines tied together with TCP/IP - UDP 
> across a small 8 port Linksys Gig ready switch/router. As far as I 
> know, that router doesn't do DHCP or assign addresses at all, it 
> might as well be strictly a fast fat switch.
> 
>    Internet service is provided by a jumper to a Belkin DHCP router, 
> so there are 5 ports tied up on the Linksys(Cisco) switch.   Only 
> one on the internet router. The internet service is Cable, with our 
> node fixed, so I don't know much other way to do it.
> 
>    For whatever reason, the network connection to some of the 
> machines has become extremely erratic, inlhouse, on our side..  The 
> network connectivity popup in the bottom corner of the screen has 
> started going on and off every few seconds... "A network cable is 
> unplugged" -  then about 10 seconds later "Local Area Connection 
> 1GbPs  Status Connected" - On, off, On, Offf...
> 
>    It had started on one machine.   I went to a spare network card.  
> It went fine for about a week, now the problems back, but on more 
> than one machine.