ethtool but may not be automatically installed. To find out run the command specifying the ethernet adapter ID as root or via sudo depending on distribution i.e.
ethtool enp0s3 (replace with your actual interface ID)
...
MDI-X: off (auto)
...
Per the ethtool man page.
Quote:
mdix auto|on|off
Selects MDI-X mode for port. May be used to override the
automatic detection feature of most adapters. An argument
of auto means automatic detection of MDI status, on forces
MDI-X (crossover) mode, while off means MDI (straight
through) mode. The driver should guarantee that this
command takes effect immediately, and if necessary may
reset the link to cause the change to take effect.
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Do you have all 1GB or higher ethernet adapters, switches and routers?
