Orolia Spectracom VelaSync 1232, User Manual

Page: 63 / 268

1.
Navigate to MANAGEMENT > NETWORK: SSH Setup . The SSH Setup window
will display.
The window contains two tabs:
Host Keys : SSH uses Host Keys to uniquely identify each SSH server. Host
keys are used for server authentication and identification.
Public Key : This is a text field interface that allows the user to edit the public
key files
authorized_keys
file.
Note: Should you exit the SSH Setup window (by clicking X in the top
right corner of the window, or by clicking anywhere outside of the
window), while filling out the Certificate Request Parameters form
before clicking
Submit , any information you entered will be lost.
When switching between tabs within the SSH Setup window, how-
ever, the information you have entered will be retained.
Host Keys
You may choose to delete individual RSA or DSA host keys. Should you decide to delete
the RSA or DSA key, the SSH will function, but that form of server authentication will not
be available. Should you delete both the RSA and DSA keys, SSH will not function. In addi-
tion, if SSH host keys are being generated at the time of deletion, the key generation pro-
cesses are stopped, any keys created will be deleted, and all key bit sizes are set to 0.
You may choose to delete existing keys and request the creation of new keys, but it is
often simpler to make these requests separately.
You can create individual RSA and DSA Host Public/Private Key pairs. Host keys must first
be deleted before new Host Keys can be created.
VelaSync units have their initial host keys created at the factory. RSA host key sizes can
vary between 768 and 4096 bits. The recommended key size is 1024. Though many key
sizes are supported, it is recommended that users select key sizes that are powers of 2 or
divisible by 2. The most popular sizes are 768, 1024, and 2048. Large key sizes of up to
4096 are supported, but may take 10 minutes or more to generate. DSA keys size support
is limited to 1024 bits.
Host keys are generated in the background. Creating RSA and DSA keys, each with 1024
bits length, typically takes about 30 seconds. Keys are created in the order of RSA, DSA,
RSA. When the keys are created, you can successfully make SSH client connections. If the
unit is rebooted with host key creation in progress, or the unit is booted and no host keys
exist, the key generation process is restarted. The key generation process uses either the
previously specified key sizes or, if a key size is undefined, the default key bit length size
used is 2048. A key with a zero length or blank key size field is not created.
2.9 Configuring Network Settings
CHAPTER
2
•
VelaSync 1232 User Manual Rev. 4 51