Linux Network Info
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Internal
Network Interfaces
ip
To see all network interfaces present on the system: Linux ip#Show_All_Network_Interfaces_and_Their_Details.
To see details about a specific network interface: Linux ip#Show_Details_for_a_Specific_Network_Interface.
For more details see ip.
ifconfig
Performance Characteristics
Go to /sys/class/net/eth0/
Then:
cat speed
Performance characteristics can also be obtained with:
Vendor
lspci | grep -i Ethernet