What is Sendq?

High Send-Q means the data is put on TCP/IP send buffer, but it is not sent or it is sent but not ACKed. So, high value in Send-Q can be related to server network congest, server performance issue or data packet flow control, and so on. Please note: The send and receive queue sizes are shown in bytes.

Table of Contents

What is U_str?

u_str is a stream socket and equivalent to netstat ‘s SOCK_STREAM. SOCK_STREAM: This is a stream (connection) socket.

What is RECV Q?

The “Recv-Q” and “Send-Q” columns tell us how much data is in the queue for that socket, waiting to be read (Recv-Q) or sent (Send-Q). In short: if this is 0, everything’s ok, if there are non-zero values anywhere, there may be trouble.

How do you explain netstat?

The network statistics ( netstat ) command is a networking tool used for troubleshooting and configuration, that can also serve as a monitoring tool for connections over the network. Both incoming and outgoing connections, routing tables, port listening, and usage statistics are common uses for this command.

What is fin_wait1 state?

This seems to occur when the server has an active connection with a client and wants to shut down the TCP connection (probably in response to a normal application layer “exit”). The server sends the client a packet with a “FIN” bit set. At this point, the server is in FIN_WAIT_1 state.

What is Close_wait?

CLOSE_WAIT – Indicates that the server has received the first FIN signal from the client and the connection is in the process of being closed. This means the socket is waiting for the application to execute close() . A socket can be in CLOSE_WAIT state indefinitely until the application closes it.

What is Sudo SS?

To save the output to a file, you can use the output redirection operator as shown in the command: sudo ss > output.txt. NOTE: It is good to note that running the ss command with and without sudo privileges might give different outputs—meaning the ss command lists information based on the user context.

What is netstat TCP?

The Work with TCP/IP Network Status (WRKTCPSTS) command, also known as NETSTAT, is used to get information about the status of TCP/IP network routes, interfaces, TCP connections and UDP ports on your local system. You can also use NETSTAT to end TCP/IP connections and to start or end TCP/IP interfaces.

What is difference between netstat and netstat?

netstat will display all of the TCP connections in every State except for LISTENING. netstat -a will display all of the TCP connections in every State (including LISTENING), and it will also display the UDP listening ports. Am I correct?

What is Syn_recv state?

SYN_RECV A connection request has been received from the network. FIN_WAIT1 The socket is closed, and the connection is shutting down. FIN_WAIT2 Connection is closed, and the socket is waiting for a shutdown from the remote end.

What is Tcp_fin_timeout?

tcp_fin_timeout (integer; default: 60) This specifies how many seconds to wait for a final FIN packet. before the socket is forcibly closed. This is strictly a viola- tion of the TCP specification, but required to prevent denial-

Why am I getting a send-Q error?

Note also that the Send-Q issue may be caused not because of the receiver, but by some routing issue somewhere between the sender and the receiver. Some packets are “on the fly” between the 2 hosts, but not ACKnowledge yet.

What does high send-Q value mean?

What does send-Q value of 8002 mean?

Customer should check the application listening the port 8002. High Send-Q means the data is put on TCP/IP send buffer, but it is not sent or it is sent but not ACKed. So, high value in Send-Q can be related to server network congest, server performance issue or data packet flow control, and so on.