Interface with many errors

rod at rod at
Wed Dec 11 09:55:18 EST 2002

From:           	Michael Still <mikal at>
To:             	Linux user group <linux at>
Subject:        	Interface with many errors
Date sent:      	Mon, 9 Dec 2002 19:57:55 +1100

> 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?

The cisco is set to not autonegotiate and the linux eth port is (correct default for 
most cards).  Just set the cisco port to auto negotiate rate and duplex and the 
problem will go away. 
There are some good guidelines on the cisco site should you need them.

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