Datatek DT-6061 Manuel d'utilisateur télécharger pdf (Page 36)

DT-6061 User's Manual - Platform (Build 17.1)

12/14/09

Datatek Applications Inc. 36

6.8 R

-T

IME

OMMANDS

6.8.1 D

ISPLAY

ONNECTIONS

–

DC OR DCONN

Syntax: dc | dconn [app [app#]][ -f ] [ -a ]

The DT-6XXX may have thousands of TCP connections to other elements. A complete list of

these connections is reported by the dc (or dconn) command. The optional -a causes the report

to include the listening ports awaiting connection requests. The following is a dc report example:

< DT-6061> dc

Active Internet connections

Proto Recv-Q Send-Q Local Address Foreign Address (state)

tcp 0 0 192.168.8.250.10002 135.17.59.198.34052

ESTABLISHED

tcp 0 0 192.168.8.250.10010 135.17.59.198.34054

ESTABLISHED

tcp 0 0 192.168.8.250.1340 192.168.8.15.31000

SYN_SENT

udp 0 0 192.168.8.20.1030 *.*

udp 0 0 192.168.8.20.9998 *.*

In the above report, “Recv-Q” and “Send-Q” indicate the number of bytes currently buffered for

receive processing, or queued for transmission, respectively. Note that no foreign address is

shown in the case of UDP protocol, because UDP is a connectionless protocol. The following are

the possible TCP connection states:

BOUND Bound to a local address, ready to connect or listen.

CLOSED Closed. The socket is not being used.

CLOSING Closed, then remote shutdown; awaiting acknowledgment.

CLOSE_WAIT Remote shutdown; waiting for the socket to close.

ESTABLISHED Connection has been established.

FIN_WAIT_1 Socket closed; shutting down connection.

FIN_WAIT_2 Socket closed; waiting for shutdown from remote.

IDLE Idle, opened but not bound.

LAST_ACK Remote shutdown, then closed; awaiting acknowledgment.

LISTEN Listening for incoming connections.

SYN_RECEIVED Initial synchronization of the connection underway.

SYN_SENT Actively trying to establish connection.

TIME_WAIT Wait after close for remote shutdown retransmission.

A variation of the dc command:

dc app [ -f ] [ -a ]

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 71 72

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Datatek DT-6061 Manuel d'utilisateur Page 36

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