TMS zl Management and Configuration Guide ST.1.1.100430

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Virtual Private Networks
Configure a GRE over IPsec VPN with Manual Keying
3. Click Add IPsec Proposal. The Add IPsec Proposal window is displayed.
Figure 7-244. Add IPsec Proposal Window
4. For Proposal Name, type a descriptive string of 1 to 32 alphanumeric
characters. The string must be unique to this proposal.
Often, it is a good idea to indicate the algorithms that you will select in
the name—for example, ESP3desMD5.
5. For Encapsulation Mode, select Transport Mode.
This is the correct mode for this type of VPN because the TMS zl Module
and the remote tunnel endpoint originate all of the GRE traffic.
6. For Security Protocol, select AH or ESP.
7. If you selected ESP in the previous step, select one of the following for
Encryption Algorithm:
•NULL
If you select this option, VPN traffic will not be encrypted.
•DES
•3DES
• AES-128 (16)
• AES-192 (24)
• AES-256 (32)
The number in parentheses after AES options indicates the key length for
the algorithm in bytes.