Allied-telesis AT-S62 Manual do Utilizador descarregar pdf (Página 544)

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Chapter 28: Secure Shell (SSH) Protocol

Section VII: Management Security 544

SSH Overview

Secure management is increasingly important in modern networks, as

the ability to easily and effectively manage switches and the

requirement for security are two universal requirements. Switches are

often remotely managed using remote sessions via the Telnet protocol.

This method, however, has a serious security problem—it is only

protected by plaintext usernames and passwords which are vulnerable

to wiretapping and password guessing.

The Secure Shell (SSH) protocol provides encrypted and strongly

authenticated remote login sessions, similar to the Telnet and rlogin

protocols, between a host running a Secure Shell server and a machine

with a Secure Shell client.

The AT-S62 management software features Secure Shell server software

to enable network managers to securely manage the switch over an

insecure network. It offers the benefit of cryptographic authentication

and encryption. Secure Shell can replace Telnet for remote management

sessions.

Support for SSH The AT-S62 management software implementation of the SSH protocol

is compliant with SSH1 (versions 1.3 and 1.5) and SSH2 (version 2.0).

In addition, the following SSH options and features are supported:

❑ Inbound SSH connections (server mode) is supported.

❑ The following security algorithms are supported:

— 128-bit Advanced Encryption Standard (AES),

192-bit AES, and 256-bit AES

— Arcfour (RC4) security algorithm is supported.

— Triple-DES (3DES) encryption for SSH sessions is supported.

❑ RSA public keys with lengths of 512 to 2048 bits are supported.

Keys are stored in a format compatible with other Secure Shell

implementations, and mechanisms are provided to copy public

keys to and from the switch.

❑ Compression of SSH traffic.

The following SSH options and features are not supported:

❑ IDEA or Blowfish encryption

❑ Nonencrypted Secure Shell sessions

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