HP TMS zl Module Security Administrator's Guide

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Configuring a VPN on the HP TMS zl Module
Configuring an IPsec Site-to-Site VPN with IKE
The group determines the length of the prime number used during the
exchange. The larger the number, the more secure the key generated
by the exchange.
b. For Encryption Algorithm, select one of these protocols, listed from
least secure (and least processor-intensive) to most:
–DES
– AES-128 (16)
–3DES
– AES-192 (24)
– AES-256 (32)
The number in parentheses after AES options indicates the key length
for the algorithm in bytes.
c. For Authentication Algorithm, select one of these protocols, listed from
least secure (and least processor-intensive) to most:
–MD5
–SHA-1
d. For SA Lifetime in Seconds, type the number of seconds that the IKE
SA is kept open.
Valid values are between 300 seconds and 86400 seconds (1 day).
Remember that this setting applies to IKE SA, which is a temporary
tunnel used only to establish the IPsec SA.
18. Click Next.