netstat Linux Commands
What is Linux netstat Command?
Explanation
netstat COMMAND: nestat command displays statistics information and current state of network connections, protocol, ports/ sockets and devices.SYNTAX :
netstat [options]OPTIONS:
-s
dispalys statics information about protocols.
-i
dispalys statistics information about the network interface.
-r
diplays routing table.
-c
displays statistics information and updates every second.
-l
displays information about all sockets that are in listening state.
-a
displays information about all sockets that are in listening and non-listening state.
-p
displays information about sockets with ProcessName and PID.
EXAMPLE:
- To get statistics of network connections:
netstat
The sample output of above command:
Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 vhost:32803 LocalHost:smtp TIME_WAIT tcp 0 0 vhost:32803 google.com:http ESTABLISHED
Where, Proto -Specifies the Protocol used for connection. Recv-Q -Specifies the Number of Bytes which are not recevied. Send-Q -Specifies the Number of Bytes not send to destination. Local Address -Specifies the local or source address and port. Foreign Address -Specifies the destination address and port. State -Specifies the current state of conection to the socket.
- ESTABLISHED - Connection is Established.
- TIME_WAIT - Waiting to receive packets.
- LISTEN - Listening to establish connection.
- To Get Statistics of Protocols:
netstat -s
The Sample output of above command:
- IP:
- 5193 incoming packets delivered
- 4813 requests sent out
- Tcp:
- 4033 segments received
- 4813 segments send out
- Icmp:
- 41 ICMP messages received
- 178 ICMP messages sent
- To Get statistics of Network Interface:
netstat -i
The sample output of above command:
Kernel Interface table Iface MTU Met RX-OK RX-ERR TX-OK TX-ERR Flg eth0 1500 0 1308 0 1345 0 BMRU
This is the statistics information of Ethernet Card[eth0].
netstat [options]
OPTIONS:
-s
dispalys statics information about protocols.
-i
dispalys statistics information about the network interface.
-r
diplays routing table.
-c
displays statistics information and updates every second.
-l
displays information about all sockets that are in listening state.
-a
displays information about all sockets that are in listening and non-listening state.
-p
displays information about sockets with ProcessName and PID.
EXAMPLE:
- To get statistics of network connections:
netstat
The sample output of above command:
Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 vhost:32803 LocalHost:smtp TIME_WAIT tcp 0 0 vhost:32803 google.com:http ESTABLISHED
Where, Proto -Specifies the Protocol used for connection. Recv-Q -Specifies the Number of Bytes which are not recevied. Send-Q -Specifies the Number of Bytes not send to destination. Local Address -Specifies the local or source address and port. Foreign Address -Specifies the destination address and port. State -Specifies the current state of conection to the socket.
- ESTABLISHED - Connection is Established.
- TIME_WAIT - Waiting to receive packets.
- LISTEN - Listening to establish connection.
- To Get Statistics of Protocols:
netstat -s
The Sample output of above command:
- IP:
- 5193 incoming packets delivered
- 4813 requests sent out
- Tcp:
- 4033 segments received
- 4813 segments send out
- Icmp:
- 41 ICMP messages received
- 178 ICMP messages sent
- To Get statistics of Network Interface:
netstat -i
The sample output of above command:
Kernel Interface table Iface MTU Met RX-OK RX-ERR TX-OK TX-ERR Flg eth0 1500 0 1308 0 1345 0 BMRU
This is the statistics information of Ethernet Card[eth0].
| -s | dispalys statics information about protocols. |
| -i | dispalys statistics information about the network interface. |
| -r | diplays routing table. |
| -c | displays statistics information and updates every second. |
| -l | displays information about all sockets that are in listening state. |
| -a | displays information about all sockets that are in listening and non-listening state. |
| -p | displays information about sockets with ProcessName and PID. |
- To get statistics of network connections:netstatThe sample output of above command:
Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 vhost:32803 LocalHost:smtp TIME_WAIT tcp 0 0 vhost:32803 google.com:http ESTABLISHED
Where, Proto -Specifies the Protocol used for connection. Recv-Q -Specifies the Number of Bytes which are not recevied. Send-Q -Specifies the Number of Bytes not send to destination. Local Address -Specifies the local or source address and port. Foreign Address -Specifies the destination address and port. State -Specifies the current state of conection to the socket. - ESTABLISHED - Connection is Established.
- TIME_WAIT - Waiting to receive packets.
- LISTEN - Listening to establish connection.
- To Get Statistics of Protocols:netstat -sThe Sample output of above command:
- IP:
- 5193 incoming packets delivered
- 4813 requests sent out
- Tcp:
- 4033 segments received
- 4813 segments send out
- Icmp:
- 41 ICMP messages received
- 178 ICMP messages sent
- To Get statistics of Network Interface:netstat -iThe sample output of above command:This is the statistics information of Ethernet Card[eth0].
Kernel Interface table Iface MTU Met RX-OK RX-ERR TX-OK TX-ERR Flg eth0 1500 0 1308 0 1345 0 BMRU
