Specifications

Enable Mode Command Set Command Reference Guide

debug ip tcp events

Use the debug ip tcp events command to activate debug messages associated with significant TCP events

such as state changes, retransmissions, session aborts, etc., in the ADTRAN OS. Debug messages are

displayed (real-time) to the terminal (or Telnet) screen. Use the no form of this command to disable the

debug messages.

These debug events are logged for packets that are sent or received from the router.

Forwarded TCP packets are not included.

Syntax Description

No subcommands.

Default Values

By default, all debug messages in the ADTRAN OS are disabled.

Command Modes

# Enable Command Mode

Command History

Release 4.1 Command was introduced

Functional Notes

In the

debug ip tcp events

information, TCB stands for TCP task control block. The numbers which

sometimes appear next to TCB (e.g.,

TCB5

in the following example) represent the TCP session number. This

allows you to differentiate debug messages for multiple TCP sessions.

Usage Examples

The following is sample output for this command:

enable

debug ip tcp events

2003.02.17 07:40:56 IP.TCP EVENTS TCP: Allocating block 5

2003.02.17 07:40:56 IP.TCP EVENTS TCB5: state change: FREE->SYNRCVD

2003.02.17 07:40:56 IP.TCP EVENTS TCB5: new connection from 172.22.75.246:3473 to

10.200.2.201:23

2003.02.17 07:40:56 IP.TCP EVENTS TCB5: state change: SYNRCVD->ESTABLISHED

[172.22.75.246:3473]

2003.02.17 07:41:06 IP.TCP EVENTS TCB5: Connection aborted -- error = RESET

2003.02.17 07:41:06 IP.TCP EVENTS TCB5: De-allocating tcb