Reference Guide

Dell#copy scp: flash:
Address or name of remote host []: 10.10.10.1
Port number of the server [22]: 99
Source file name []: test.cfg
User name to login remote host: admin
Password to login remote host:
Removing the RSA Host Keys and Zeroizing Storage
Use the crypto key zeroize rsa command to delete the host key pairs, both the public and private key information for
RSA 1 and or RSA 2 types. Note that when FIPS mode is enabled there is no RSA 1 key pair. Any memory currently holding these
keys is zeroized (written over with zeroes) and the NVRAM location where the keys are stored for persistence across reboots is
also zeroized.
To remove the generated RSA host keys and zeroize the key storage location, use the crypto key zeroize rsa
command in CONFIGURATION mode.
Dell(conf)#crypto key zeroize rsa
Configuring When to Re-generate an SSH Key
You can configure the time-based or volume-based rekey threshold for an SSH session. If both threshold types are configured,
the session rekeys when either one of the thresholds is reached.
To configure the time or volume rekey threshold at which to re-generate the SSH key during an SSH session, use the ip ssh
rekey [time rekey-interval] [volume rekey-limit] command. CONFIGURATION mode.
Configure the following parameters:
● rekey-interval: time-based rekey threshold for an SSH session. The range is from 10 to 1440 minutes. The default is 60
minutes.
● rekey-limit: volume-based rekey threshold for an SSH session. The range is from 1 to 4096 to megabytes. The default is
1024 megabytes.
Examples
The following example configures the time-based rekey threshold for an SSH session to 30 minutes.
Dell(conf)#ip ssh rekey time 30
The following example configures the volume-based rekey threshold for an SSH session to 4096 megabytes.
Dell(conf)#ip ssh rekey volume 4096
Configuring the SSH Server Cipher List
To configure the cipher list supported by the SSH server, use the ip ssh server ciphers cipher-list command in
CONFIGURATION mode.
cipher-list-: Enter a space-delimited list of ciphers the SSH server will support.
The following ciphers are available.
● 3des-cbc
● aes128-cbc
● aes192-cbc
● aes256-cbc
● aes128-ctr
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