Concept Guide

Supported Modes All Modes
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.4(0.0) Supported on the FN I/O Aggregator.
9.3(0.0) Supported on the M I/O Aggregator.
Usage Information The software measures the period of inactivity dened in this command as the period between consecutive
keystrokes. For example, if your password is “password” you can enter “p” and wait 29 seconds to enter the next
letter.
SSH Server and SCP Commands
The Dell Networking OS supports secure shell (SSH) protocol versions 1.5 and 2.0. SSH is a protocol for secure remote login over an
insecure network. SSH sessions are encrypted and use authentication.
crypto key generate
Generates keys for the SSH server.
Syntax
crypto key generate {rsa | rsa1}
Parameters
rsa Enter the keyword rsa then the key size to generate a SSHv2 RSA host keys. The range
is from 1024 to 2048 if you did not enable FIPS mode; if you enabled FIPS mode, you can
only generate a 2048-bit key. The default is 1024.
rsa1 Enter the keyword rsa1 then the key size to generate a SSHv1 RSA host keys. The
range is from 1024 to 2048. The default is 1024.
Defaults Key size 1024; if you enable FIPS mode, the key size is 2048.
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
The host keys are required for key-exchange by the SSH server. If the keys are not found when you enable the
server (ip ssh server enable), the keys are automatically generated.
This command requires user interaction and generates a prompt prior to overwriting any existing host keys.
NOTE: Only a user with superuser permissions should generate host-keys.
Example
Dell(conf)#crypto key generate rsa
Enter key size <1024-2048>. Default<1024> :
Host key already exists. Overwrite (y/n)?y
Generating 1024-bit SSHv2 RSA key.
! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
Dell(conf)#
Dell(conf)#crypto key generate rsa1
Enter key size <1024-2048>. Default<1024> :
Host key already exists. Overwrite (y/n)?y
1188 Security