Avaya BSGX4e User's Guide download pdf (Page 401)

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SSH F

UNCTIONALITY

This chapter provides information about the SSH server, SFTP, and the subsystems

SSH-TRANS, SSH-AUTH, and SSH-CONNECT.

Introduction

SSH provides secure Internet access to the BSGX4e CLI, which enables system

administration to log on remotely, and securely configure and monitor the BSGX4e

over an insecure network.

SSH consists of three components:

 The Transport Layer Protocol [SSH-TRANS] provides server authentication,

confidentiality, and integrity. As an option, compression can be provided.

SSH-TRANS is usually run over a TCP/IP connection, but it can also run over any

other reliable data stream.

 The User Authentication Protocol [SSH-AUTH] authenticates the client-side user

to the server. SSH-AUTH runs over the transport layer protocol.

 The Connection Protocol [SSH-CONNECT] multiplexes the encrypted tunnel into

several logical channels. SSH-CONNECT runs over the user authentication

protocol.

The SSH authentication process proceeds as follows:

 The client sends a service request a secure transport layer connection is

established.

 A second service request is sent after user authentication is complete.

 New protocols are defined and coexist with the protocols listed above:

SSH-TRANS, SSH-AUTH and SSH-CONNECT.

 SSH and SFTP provide server functionality only; client functionality is not

provided.

SSH Server Functionality

The following summarizes the SSH functions and constraints.

 The SSH server supports up to three (3) concurrent connections.

 The SSH server listens for connections on a single TCP port.

 The port can be set to which the SSH server listens for connections.

 When a connection is accepted, it is handled first by the SSH-TRANS subsystem.

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Avaya BSGX4e User's Guide Page 401

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