General Debug Commands

The following list provides examples for the commands generally used for debugging Ethernet connections.

Check Ethernet device information:
- Check adapter status:
```
ifconfig eth0
```
- Check data package send and receive statistics:
```
cat /proc/net/dev
```
- Check the current speed:
```
cat /sys/class/net/eth0/speed
```
Enable or disable an Ethernet device.
- Enable:
```
ifconfig eth0 up
```
- Disable:
```
ifconfig eth0 down
```
Configure an Ethernet device.
- Configure static IP address:
```
ifconfig eth0 192.168.1.101
```
- Configure MAC address:
```
ifconfig eth0 hw ether 00:11:22:aa:bb:cc
```
- Automatically obtain the IP address:
```
udhcpc -i eth0
```
- Set PHY mode: (Set the speed of 100 M, enable full duplex and auto negotiation.)
```
ethtool -s eth0 speed 100 duplex full autoneg on
```
General test commands:
- Connection test:
```
ping 192.168.1.101
```
- Throughput test:
  
  Note: Make sure you have enabled the iperf tool in the kernel menu before performing the test.
  - TCP throughput test:
    Server side:
```
iperf3 -s -i 1
```
    Client side:
```
iperf3 -c 192.168.1.101 -i 1 -t 60 -P 4
```
  - UDP throughput test:
    Server side:
```
iperf3 -s -u -i 1
```
    Client side:
```
iperf3 -c 192.168.1.101 -u -b 100M -i 1 -t 60 -P 4
```