(sec: unclas) Interface with many errors

Frank Ranner Frank.Ranner at defence.gov.au
Tue Dec 10 18:00:43 EST 2002

Michael Still wrote:
> Hello.
> I have a machine plugged into a Cisco 1900 10mbit switch via some CAT5. I
> am looking at the ifconfig provided network statistics, and about half of
> the packets are errors. Any ideas what might cause this?
> eth0      Link encap:Ethernet  HWaddr 00:20:35:71:B5:F0
>           inet addr:  Bcast:  Mask:
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1305814 errors:525101 dropped:0 overruns:0 frame:788589
>           TX packets:819869 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           RX bytes:1898529454 (1810.5 Mb)  TX bytes:54543631 (52.0 Mb)
>           Interrupt:9 Base address:0xe000
> Is this bad cabling?

It is probably a disagreement between full and half duplex. The linux
side is not 
showing collisions, and is probably in full duplex. The switch end may
be in half 
duplex, which will cause it to abort a frame send if it sees data coming
from the 
linux box. This would result in a frame error at the linux end, and a 
'late collision' at the switch end. You can telnet to the switch itself 
and check the port parameters and status.
Frank Ranner                             frank.ranner at defence.gov.au
xenaphobia: The fear of being beaten to a pulp by
            a leather-clad, New Zealand woman.

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