ethtool
See ethtool for the details. Here are a few frequently used ones:
# Get general info and connectivity status
/sbin/ethtool eth0
# Get driver info
/sbin/ethtool -i eth0
# Get offload info
/sbin/ethtool -k eth0
# Set offload params. Eg. disable tcp and udp checksumming
/sbin/ethtool -K eth0 tx off# To check checksum status:
tcpdump -vv -n -i eth0
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