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Avocent CCM1640, CCM840 Connecting to devices using SSH, To display PPP conﬁguration information:

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Chapter 3: Operations	23

For more information, see Show Server CLI command and Server PPP command in Chapter 5.

To display PPP conﬁguration information:

Issue a Show Server PPP command.

SHOW SERVER PPP

For more information, see Show Server PPP command in Chapter 5.

Connecting to devices using SSH

The CCM supports version 2 of the SSH protocol (SSH2). The CCM SSH server operates on the standard SSH port 22. The shell for this connection provides a CLI prompt as if you had established a Telnet connection on port 23. The shell request for this connection is for CLI access.

Additional CCM SSH servers operate on TCP ports that are numbered with values 100 greater than the standard 30xx Telnet ports for the CCM. For example, if port 7 is configured for Telnet access on port 3007, then port

3107 will be a direct SSH connection for port 7. When SSH is enabled, Telnet port 23 connections will be accepted from other clients if the Server Security command includes Encrypt=SSH,None. Connecting to Telnet port 23 may be tunneled via a connection to SSH port 22.

SSH server keys

When SSH is enabled for the first time, the CCM generates an SSH server key. The key generation process may take up to ten minutes. The key is computed at random and is stored in the CCM configuration database.

In most cases, the SSH server key should not be modified because most SSH clients will associate the key with the IP address of the CCM. During the first connection to a new SSH server, the client will display the fingerprint of the SSH server key and prompt you to indicate if you wish to store it on the SSH client. After the first connection, most SSH clients will validate the key when connecting to the CCM. This provides an extra layer of security because the SSH client can verify the key sent by the server each time it connects.

If you disable SSH and later reenable it, you may either use the existing server key or compute a new one. If you are reenabling the same server at the same IP address, it is recommended that you use the existing key, as SSH clients may be using it for verification. If you are moving the CCM to another location and changing the IP address, you may wish to generate a new SSH server key.

Contents

Page Page Page Page Table of Contents Page 1 Product Overview Page Chapter 1: Product Overview Features and Benefits Safety Precautions Rack mount safety considerations Using AVWorks Page Installation and Configuration Page Chapter 2: Installation and Configuration Hardware Overview Installing the CCM Configuring the CCM Configuring the IP address and subnet mask To conﬁgure the IP address and subnet mask using a Telnet CLI: To conﬁgure the CCM using the serial CLI: Initial CCM login Reinitializing the CCM 3 Operations Page Chapter 3: Operations Overview Configuring Serial Port Settings Connecting to Serial Devices Connecting to devices using Telnet Connecting to devices from the serial CLI port Configuring and using dial-inconnections Connecting to devices using PPP Connecting to devices using SSH SSH Authentication Methods Page Enabling plain text Telnet and SSH connections Telnet CLI mode Ending device sessions Session time-outs Managing User Accounts To change a user’s conﬁguration information: To end another user’s CCM session: To delete a user: To display user conﬁguration information: Access rights and levels Using Authentication Modes Authentication summary Using Security Lock-out Managing the Port History Buffer Using port history mode commands Port History Mode Commands To access port history mode: To control the port history buffer display when you connect: To control the port history buffer content when you end a session: To clear and discard all data in a port history buffer: Managing the CCM Using SNMP To add or delete SNMP management entity addresses: To enable or disable SNMP traps: To add or delete SNMP trap destination addresses: To add, copy or delete port alert strings: To display SNMP conﬁguration information: To display port alert string information: 4 Using CCM Commands Page Chapter 4: Using CCM Commands Accessing the CLI Entering Commands When commands take effect Understanding Conventions Command syntax Page Syntax conventions Command Summary CCM Command Summary (Continued) Page Page Page 5 CCM Commands Page Chapter 5: CCM Commands Connect Command Disconnect Command Help Command Port Commands Port Alert Add command Port Alert Copy command Port Alert Delete command Port Break command Port History command Port Logout command Port Set command Page Quit Command Resume Command Server Commands Server CLI command Server FLASH command Server PPP command Server RADIUS command Server Reboot command Server Security command Server Set command Server SNMP command Server SNMP Community command Server SNMP Manager command Server SNMP Trap command Server SNMP Trap Destination command Server SSH command Show Commands Show Port command Page Show Port Alert command Show Server command Show Server CLI command Show Server PPP command Show Server RADIUS command Show Server Security command Show Server SNMP command Show User command SPC Command User Commands User Add command Page User Delete command User Logout command User Set command User Unlock command Page Appendices Page Appendices Appendix A: Technical Specifications Appendix B: Device Cabling Page RJ-45modular adaptors and cables Page Appendix C: Ports Used Appendix D: Technical Support