Version 6.2 321 February 2011
SIP User's Manual 3. Web-Based Management
9 Hash Algorithm: Select the hash algorithms that the device attempts to
use when negotiating with the IPSec peer.
9 Group Description Attribute: Select the Diffie-Hellman (DH) group
description(s). Diffie-Hellman is a public-key cryptography scheme that
allows two parties to establish a shared secret over an insecure
communications channel.
IPSec Automatic Phase 2 – Key Definition:
Figure 3-273: IPSec Tab - IPSec Automatic Phase 2
9 Life Time in Seconds: The length of time before a security association
automatically performs renegotiation.
9 Use Perfect Forward Secrecy (PFS): Select whether Perfect Forward
Secrecy of keys is required on the connection's keying channel (with
PFS, penetration of the key-exchange protocol does not compromise
keys negotiated earlier). Deselecting this option hides the next
parameter.
- Group Description Attribute: Select whether to use the same group
chosen in phase 1, or reselect specific groups.
9 Encryption Algorithm: Select the encryption algorithms that the device
attempts to use when negotiating with the IPSec peer.
9 Authentication Algorithm (for ESP protocol): Select the
authentication algorithms that the device attempts to use when
negotiating with the IPSec peer.
9 Hash Algorithm (for AH protocol): Select the hash algorithms that the
device attempts to use when negotiating with the IPSec peer.
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