Ethernet 1000baseT troubleshooting

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getting this from logs or dmesg?

NETDEV WATCHDOG: eth0: transmit timed out
e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang

Check link status with these commands:

mii-tool eth0 -v
ethtool eth0

Try this

modprobe e1000 Speed=100

But you might wish to have out of band management tested first!