(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:172.31.0.61 Bcast:172.31.0.255 Mask:255.255.255.0
> 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
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