Watchguard V10 User Manual page 344

CHAPTER 11: Using Virtual Private Networks (VPN)
6
In the Keep-Alive message field, type the number of
seconds between keep-alive messages.
7 If you selected the Main from the Mode drop-down
list, you can select the Enable Extended User
Authentication checkbox.
8 Select an IKE transform from the list or click New to
create a new IKE transform.
The New IKE Transform dialog box appears.
9
From the Authentication Type drop-down list, select
the Authentication Type.
10 From the DH Group drop-down list, select a DH
group type.
DH (Diffie-Helman) groups enable two peer systems to publicly
exchange and agree on a shared secret key. The numbers
available on the drop-down list (768 and 1024) are the number
of bits used for exponentiation to generate private and public
keys. The larger the number, the greater the protection.
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