Troubleshooting Network
layer 1: Physical
-
nmcli -
ethtool eth0 -
ip link show -
ip -br link show -
ip -s link show eth0
layer 2: Data link
ip neighbor show
layer 3: the network/internet
-
ip -br address show -
ping -c1 8.8.8.8 -
mtr / traceroute / tracepath -
ip route show 10.0.0.0/8 -
nslookup / dig
layer 4: Transport
-
ss -tulnp4 / netstat -tulpn -
telnet toto 3306 / nc toto -u 80 -
tcpdump -i eth0