10-5
Viewing TCP Group Information
Active Connections Table
The following information is displayed for each Active Connection in the TCP
Group window. If there is no TCP connection at the device, “No Connection”
displays in the connection State field.
State
The state of this TCP connection, according to the tcpConnState. Possible states are:
• closed (1)
• listen (2)
• synSent (3)
• synReceived (4)
• established (5)
• finWait1 (6)
• finWait2 (7)
• closeWait (8)
•lastAck (9)
• closing (10)
• timeWait (11)
• deleteTCB (12)
The only value which may be set by a management station is deleteTCB (12).
Accordingly, it is appropriate for an agent to return a ‘badValue’ response if a
management station attempts to set this object to any other value. If a
management station sets this object to the value deleteTCB (12), then this has the
effect of deleting the TCB (as defined in RFC 793) of the corresponding connection
on the managed node, resulting in immediate termination of the connection. As
an implementation-specific option, a RST segment may be sent from the managed
node to the other TCP endpoint (note however that RST segments are not sent
reliably). During the course of a TCP communication session, the connection’s
State will change depending on the current activity. From a management station,
a manager can set the state to deleteTCB, which severs the connection.
Local Address
The local IP address for this TCP connection, according to the
tcpConnLocalAddress. In the case of a connection in the listen state which is willing
to accept connections for any IP interface associated with the node, the value
0.0.0.0 is used.
Local Port
The local port number for this TCP connection, according to the tcpConnLocalPort.
Remote Address
The remote IP Address for this TCP connection, according to the
tcpConnRemAddress.