[Sis-SCPS-INTEREST] tx collisions: duplex state resolved, collisions are not.

Thu May 4 18:48:03 EDT 2006

Okay, I'll try switching to a switch (so to speak), but I still don't 
understand why it's only necessary when scps is running; without scps, I 
transfer data at a higher rate over the identical hardware and have no 
collisions at all...

Dan

Otto Solares wrote:
> You will never get full-duplex as hubs are not full duplex, collision
> are the norm in hubs too, replace the hub with a switch and you will
> solve your problem (if half-duplex and collisions are a problem for
> you).  As for sniffing traffic you can always use tcpdump or ethereal
> so the hub is needless.
>
> -otto
>
> On Thu, May 04, 2006 at 12:18:58PM -0700, Dan Miller wrote:
>   
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>> <font size="+1"><font face="Times New Roman">Okay, I determined the
>> state of the linux eth interface by the simple expedient of unplugging
>> and re-plugging the connector!!&nbsp; It displays disconnect/connect
>> messages in syslog, and thereby confirmed that it was 100Mbps,
>> half-duplex.&nbsp; <br>
>> I then went to my Windows machine and changed the eth interface from
>> auto-negotiate to 100Mb/half-duplex.&nbsp; <br>
>> <br>
>> ftp transfers *still* get the same number of collisions.<br>
>> <br>
>> So now I'm pretty sure duplexity (if that's a word) is not the issue.<br>
>> <br>
>> What else could cause collision??&nbsp; Again, keep in mind that if I merely
>> kill "gateway" and do another transfer, no collisions occur, and the
>> transfer is proceeding at a higher data rate (tho nowhere near
>> 100Mbit/sec).<br>
>> <br>
>> Dan Miller<br>
>> <br>
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>>     
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>   
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>
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