Strange ethrenet frame

Strange ethrenet frame

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Subject Author Date
Strange ethrenet frame Mr Lex 10-04-2006
Posted by glen herrmannsfeldt on October 23, 2006, 10:15 pm
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Mr Lex wrote:
> Does anyone have an idea ?
> Have Someone ever see this type of traffic ?

(snip)

>>23:09:18.851391 00:00:01:02:5e:8c > 45:c0:00:1c:ca:2c, ethertype
>>Unknown (0xac14), length 28:
>> 0x0000: 0452 e000 0001 1164 ee9b 0000 0000
>>.R.....d......

I believe that 45:c0 is a common beginning of an IP header.

Why you would see this in the MAC field, I don't know. Showing a hex
dump of a few whole packets would help.

-- glen


Posted by Robert Redelmeier on October 10, 2006, 2:57 pm
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> Did it possible to send traffic on a no carrier interface
> (that did not detect link activity) ? Did the dumped traffic
> is really sent or is it just traffic that "seem" to be sent
> (software garbage not physical send)? Did that mean that some
> ethernet traffic can go out of my (no carrier) ethernet card ?

This will depend entirely on the hardware (etherchip) and
device driver software. A high error rate (bad cabling) can
ersult in all sort of anomalies, some of which might appear
occasionally to be semi-valid.

-- Robert


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other useful resources:
The Federal Communications Commission (FCC)
Telecommunications Industry Association
Electronic and Software Security Products and Services
International Telecommunication Union

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