Useful Network Diagnostic CLI commands
Useful CLI commands to do network diagnostics with tcpdump / tshark etc.
tcpdump
| Command | Description |
| tcpdump -nni <network-interface> icmp | show icmp packets |
|
tcpdump -nni <network-interface> "icmp[0] == 0" |
ICMP type 0 echo reply |
|
tcpdump -nni <network-interface> "icmp[0] == 3" |
ICMP destination unreachable |
|
tcpdump -nni <network-interface> "icmp[0] == 4" |
ICMP source quench |
|
tcpdump -nni <network-interface> "icmp[0] == 5" |
ICMP redirect |
|
tcpdump -nni <network-interface> "icmp[0] == 8" |
ICMP echo request |
|
tcpdump -nni <network-interface> "icmp[0] == 11" |
ICMP time exceeded |
|
tcpdump -nni <network-interface> "tcp[tcpflags] & (tcp-rst) !=0" |
Detect tcp reset and ICMP packets |