# TCP Configuration

Device > Configure > TCP

The TCP Configuration dialog box displays the retransmission algorithm and timeout information for this device. The algorithm determines how long the system will wait, after transmitting an unacknowledged segment, before timing out and retransmitting the segment. This information helps control traffic congestion on your network.

The dialog box displays the following data:

- Retransmission Algorithm (tcpRtoAlgorithm)
- Min Retransmission Timeout (msec) (tcpRtoMin)
- Max Retransmission Timeout (msec) (tcpRtoMax)
- Max Connections (tcpMaxConn)

The following list specifies buttons in this dialog box, as well as their function:

- Click OK to continue.
- Click Apply to save the changes in the dialog box.
- Click Cancel to close the dialog box.
- Click Refresh to update the contents of the dialog box.
- Click Print to print the contents of the dialog box.
- Click Help to access online help.

Retransmission Algorithm (tcpRtoAlgorithm)

Algorithm used to determine the timeout value for retransmitting unacknowledged octets. There are four possible values:

other (1) | none of the following
constant (2) | A constant RTO
rsre (3) | MIL-STD-1778, Appendix B
vanj (4) | Van Jacobson's algorithm [10]

Min Retransmission Timeout (msec) (tcpRtoMin)

Minimum value permitted by a TCP implementation for retransmission timeout, measured in milliseconds.

Max Retransmission Timeout (msec) (tcpRtoMax)

Maximum value permitted by a TCP implementation for retransmission timeout, measured in milliseconds.

Max Connections (tcpMaxConn)

Maximum number of TCP connections the entity can support. In entities where the maximum number is dynamic, this object should have the value "-1".