tcp 0 0 192.168.22.6:55017 www.oreillynet.com:www ESTABLISHED
^ ^ ^ ^ ^ ^ ^ ^
| | | | | | | |
| | | | port remote port Connection
| | | your machine server State
| | bytes in send queue
| Bytes in recive queue
| type of connection
Connection State can be
StateDescription
LISTEN accepting connections
ESTABLISHED connection up and passing data
SYN_SENT TCP; session has been requested by us; waiting for reply from
remote endpoint
SYN_RECV TCP; session has been requested by a remote endpoint for a socket
on which we were listening
LAST_ACK TCP; our socket is closed; remote endpoint has also shut down; we
are waiting for a final acknowledgement
CLOSE_WAIT TCP; remote endpoint has shut down; the kernel is waiting for
the application to close the socket
TIME_WAIT TCP; socket is waiting after closing for any packets left on the
network
CLOSED socket is not being used (FIXME. What does mean?)
CLOSING TCP; our socket is shut down; remote endpoint is shut down; not all
data has been sent
FIN_WAIT1 TCP; our socket has closed; we are in the process of tearing down
the connection
FIN_WAIT2 TCP; the connection has been closed; our socket is waiting for
the remote endpoint to shut down
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 21775 /tmp/.X11-unix/X0
unix 2 [ ACC ] STREAM LISTENING 22279 /var/run/sock.sock
| | | | |
| |
| | | Stream State Inode
disk file
| | Flags
| Reference Count
Protocol
A Unix domain socket (UDS) or IPC socket (inter-process communication socket)
is a virtual socket, similar to an internet socket that is used in POSIX
operating systems for inter-process communication. The correct standard POSIX
term is POSIX Local IPC Sockets.
These connections appear as byte streams, much like network connections, but
all data remains within the local computer.
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