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You can monitor the following networking-related information using the utilities that are accessible from the Main Menu:

  • client connection

  • listening servers

The following table lists and describes the items on the Open Sockets fields

Open Sockets Fields Description

Item Description
Active Internet connection (servers and established)
Proto The protocol (tcp, udp, raw) used by the socket.
Recv-Q The count of bytes not copied by the user program connected to this socket.
Send-Q The count of bytes not acknowledged by the remote host.
Local Address Address and port number of the local end of the socket. Unless the -numeric (-n) option is specified, the socket address is resolved to its canonical host name, and the port number is translated into the corresponding service name.
Foreign Address Address and port number of the remote end of the socket. Analogous to Local Address.
State

The state of the socket. Because there are no states in raw mode and usually no states used in UDP, this column may be left blank. Normally, this attribute can be one of several values:

  • ESTABLISHED

The socket has an established connection.

  • SYN_SENT

The socket is actively attempting to establish a connection.

  • 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.

  • TIME_WAIT

The socket is waiting after close to handle packets still in the network.

  • CLOSED

The socket is not being used.

  • CLOSE_WAIT

The remote end has shut down, waiting for the socket to close.

  • LAST_ACK

The remote end has shut down, and the socket is closed. Waiting for acknowledgement.

  • LISTEN

The socket is listening for incoming connections. Such sockets are not included in the output unless you specify the - listening (-l) or --all (-a) option.

  • CLOSING

Both sockets are shut down but we still do not have all data sent.

  • UNKNOWN

The state of the socket is unknown.

Active UNIX domain sockets (servers and established)
Proto The protocol (usually UNIX) used by the socket.
RefCnt The reference count (in other words, attached processes using this socket).
Flags The flags displayed is SO_ACCEPTON (displayed as ACC), SO_WAITDATA (W) or SO_NOSPACE (N). SO_ACCECPTON is used on unconnected sockets if their corresponding processes are waiting for a connect request. The other flags are not of normal interest.
Type

There are several types of socket accesses:

  • SOCK_DGRAM

The socket is used in Datagram (connectionless) mode.

  • SOCK_STREAM

This is a stream (connection) socket.

  • SOCK_RAW

The socket is used as a raw socket.

  • SOCK_RDM

This one serves reliably-delivered messages.

  • SOCK_SEQPACKET

This is a sequential packet socket.

  • SOCK_PACKET

Raw interface access socket.

  • UNKNOWN

N/A for this release.

State

This attribute may have the following values:

  • FREE

The socket is not allocated.

  • LISTENING

The socket is listening for a connection request. Such sockets are only included in the output if you specify the --listening (-l) or --all (-a) option.

  • CONNECTING

The socket is about to establish a connection.

  • CONNECTED

The socket is connected.

  • DISCONNECTING

The socket is disconnecting. (empty). The socket is not connected to another one.

  • UNKNOWN

This state should never happen.

I-NodeI-Node is a data structure on a traditional Unix-style file system such as Unix File System (UFS). An I-Node stores basic information about a regular file, directory or other file system object.
PathThis is the path name as which the corresponding processes attached to the socket.

 

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