How to find out capacity for network interfaces?

Solution 1:

You're looking in the wrong place.

Look at /sys/class/net/<device>/speed.

Solution 2:

You can check the interface capacity in following ways.

1. dmesg | grep eth0

2. mii-tool -v eth0

3. ethtool eth0

Note: Change the device name according to yours.

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Solution 3:

In general, you could find this out using a tool such as strace:

sudo  strace -e trace=file -f -s128  lshw -class network