October 2002
Intermediate to advanced
560 pages
12h 13m
English
Content preview from Cisco® Field Manual: Catalyst® Switch ConfigurationBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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11-7. SSH Telnet Configuration
Telnet connections to the switch take place over TCP port 23 and are transmitted in plain text.
If someone with a network analyzer captures packets going to a server, he can see the data transmitted in plain text, including the passwords.
Secure Shell (SSH) is a method of communicating through Telnet that encrypts packets before they are transmitted between devices.
SSH runs on TCP port 22 between a SSH-compatible client and a device configured to accept SSH connections.
Cisco switches support SSH version 1 only.
To implement SSH on your switch, it must be Crypto-compatible code.
By default SSH is disabled on the switch and must be enabled before clients can connect.
Configuration
To provide secure Telnet communications ...
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