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PowerConnect B-Series FCX Configuration Guide 1207
53-1002266-01
Configuring SSH2
33
When a host key pair is generated, it is saved to the flash memory of all management modules.
To disable SSH2 on a Dell PowerConnect device, enter the following command.
PowerConnect(config)#crypto key zeroize
When SSH is disabled, it is deleted from the flash memory of all management modules.
Syntax: crypto key generate | zeroize
The generate keyword places a DSA host key pair in the flash memory and enables SSH on the
device.
The zeroize keyword deletes the DSA host key pair from the flash memory and disables SSH on the
device.
By default, public keys are hidden in the running configuration. You can optionally configure the
Dell PowerConnect device to display the DSA host key pair in the running configuration file, by
entering the following command.
PowerConnect#ssh show-host-keys
Syntax: ssh show-host-keys
To hide the public keys in the running configuration file, enter the following command.
PowerConnect#ssh no-show-host-keys
Syntax: ssh no-show-host-keys
Providing the public key to clients
If you are using SSH to connect to a Dell PowerConnect device from a UNIX system, you may need
to add the public key on the Dell PowerConnect device to a “known hosts” file; for example,
$HOME/.ssh/known_hosts. The following is an example of an entry in a known hosts file.
Configuring DSA challenge-response authentication
With DSA challenge-response authentication, a collection of clients’ public keys are stored on the
Dell PowerConnect device. Clients are authenticated using these stored public keys. Only clients
that have a private key that corresponds to one of the stored public keys can gain access to the
device using SSH.
When DSA challenge-response authentication is enabled, the following events occur when a client
attempts to gain access to the device using SSH.
AAAAB3NzaC1kc3MAAACBAPY8ZOHY2yFSJA6XYC9HRwNHxaehvx5wOJ0rzZdzoSOXxbET
W6ToHv8D1UJ/
z+zHo9Fiko5XybZnDIaBDHtblQ+Yp7StxyltHnXF1YLfKD1G4T6JYrdH YI14Om
1eg9e4NnCRleaqoZPF3UGfZia6bXrGTQf3gJq2e7Yisk/gF+1VAAAAFQDb8D5cv
wHWTZDPfX0D2s9Rd7NBvQAAAIEAlN92+Bb7D4KLYk3IwRbXblwXdkPggA4pfdtW9v
GfJ0/RHd+NjB4eo1D+0dix6tXwYGN7PKS5R/FXPNwxHPapcj9uL1Jn2AWQ2dsknf+i/FAA
vioUPkmdMc0zuWoSOEsSNhVDtX3WdvVcGcBq9cetzrtOKWOocJmJ80qadxTRHtUAAACB
AN7CY+KKv1gHpRzFwdQm7HK9bb1LAo2KwaoXnadFgeptNBQeSXG1vO+JsvphVMBJc9HS
n24VYtYtsMu74qXviYjziVucWKjjKEb11juqnF0GDlB3VVmxHLmxnAz643WK42Z7dLM5
sY29ouezv4Xz2PuMch5VGPP+CDqzCM4loWgV