Slow network copies – duplex mismatch?

This content is 20 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

Whilst copying some files across the network today it seemed to me that the operation seemed to be taking much longer than it should. It looks like there may have been a duplex mismatch as setting the network interface cards to 100/full instead of auto seemed to fix the problem.

I’m not sure if this is entirely accurate, but I remember an ex-colleague of mine telling me that the network speed can be auto-detected but auto-detecting the duplex is less reliable.

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