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Re: Network connections breaking after bootup



On Tue, May 15, 2007 at 07:27:26PM +0100, Karl E. Jorgensen wrote:
> On Tue, May 15, 2007 at 10:22:50AM +0000, Tim Johnson wrote:
> > On Tuesday 15 May 2007 17:33, Antti Talsta wrote:
> > > On Tue, 15 May 2007, Tim Johnson wrote:
> > > > eth0      Link encap:Ethernet  HWaddr 00:80:AD:79:35:E1
> > > >          inet addr:192.168.1.3  Bcast:192.168.1.255  Mask:255.255.255.0
> > > >          inet6 addr: fe80::280:adff:fe79:35e1/64 Scope:Link
> > > >          UP BROADCAST MULTICAST  MTU:1500  Metric:1
> > > >          RX packets:28 errors:248 dropped:0 overruns:0 frame:0
>                              ----------
>  
> > >
> >  Hi Antti:
> >  1)What do you see that is amiss? 
> >     (I'm neither that hardware-savvy or system-savvy)
> 
> Tim did underline the suspect area (just as I'm doing above)...
> 
> This points towards link-level errors - things like the frame-level 
> checksum not matching etc. etc. which ...
> 
> > > Faulty netcard or cable ?
> 
> ... could easily be the result of a faulty (or insufficiently 
> shielded) cable...  Or a faulty switch/hub.  Or alternatively: a faulty 
> card (but then I'd only expect to see the error count increasing on 
> *one* side of the cable).
> 
> >   2)If the card or cable was faulty, what would contribute
> >      to the behavior of having network connection right away
> >      after bootup and login, and then the connection is lost
> >      with minutes or *after* an initial connection?
> 
> I see your logic, and I don't have a proper explanation... Perhaps the 
> underlying network code "gives up" once the error count reaches a 
> certain number?  Or perhaps the two are getting further and further 
> "out-of-sync" where things eventually fail?  Guesswork on my part...

could it be a managed switch with some intrusion detection software that kills 
the port after x many errors / faults ?



> 
> Hope this helps
> -- 
> Karl E. Jorgensen
> karl@jorgensen.org.uk  http://www.jorgensen.org.uk/
> karl@jorgensen.com     http://karl.jorgensen.com
> ==== Today's fortune:
> It's OKAY -- I'm an INTELLECTUAL, too.


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