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ProSecure Unified Threat Management UTM10 or UTM25 Reference Manual
7-28 Virtual Private Networking Using IPsec Connections
v1.0, September 2009
Authentication Algorithm From the pull-down menu, select one of the following two algorithms to use
in the VPN header for the authentication process:
• SHA-1. Hash algorithm that produces a 160-bit digest. This is the default
setting.
• MD5. Hash algorithm that produces a 128-bit digest.
Authentication Method Select one of the following radio buttons to specify the authentication
method:
• Pre-shared key. A secret that is shared between the UTM and the remote
endpoint.
• RSA-Signature. Uses the active Self Certificate that you uploaded on the
Certificates screen (see “Managing Self Certificates” on page 9-20). The
Pre-shared key is masked out when you select the RSA-Signature option.
Pre-shared key A key with a minimum length of 8 characters no more
than 49 characters. Do not use a double quote (“) in the
key.
Diffie-Hellman (DH)
Group
The DH Group sets the strength of the algorithm in bits. The higher the
group, the more secure the exchange. From the pull-down menu, select one
of the following three strengths:
• Group 1 (768 bit).
• Group 2 (1024 bit). This is the default setting.
• Group 5 (1536 bit).
Note: Ensure that the DH Group is configured identically on both sides.
SA-Lifetime (sec) The period in seconds for which the IKE SA is valid. When the period times
out, the next rekeying must occur. The default is 28800 seconds (8 hours).
Enable Dead Peer
Detection
Note: See also
“Configuring Keepalives
and Dead Peer
Detection” on page 7-54.
Select a radio button to specify whether or not Dead Peer Detection (DPD) is
enabled:
• Yes. This feature is enabled: when the UTM25 detects an IKE connection
failure, it deletes the IPsec and IKE SA and forces a reestablishment of the
connection. You must enter the detection period and the maximum number
of times that the UTM attempts to reconnect (see below).
• No. This feature is disabled. This is the default setting.
Detection Period The period in seconds between consecutive
“DPD R-U-THERE” messages, which are sent only when
the IPsec traffic is idle.
Reconnect after
failure count
The maximum number of times that the UTM attempts to
reconnect after a DPD situation. When the maximum
number of times is exceeded, the IPsec connection is
terminated.
Table 7-10. Add IKE Policy Settings (continued)
Item Description (or Subfield and Description)