TMS zl Management and Configuration Guide ST.1.1.100226

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Virtual Private Networks
Configure a GRE over IPsec VPN with Manual Keying
Figure 7-252. Add IPsec Policy Window—Step 4 of 4
17. If desired, configure settings in the Advanced Settings (Optional) section.
a. Select the check boxes for the advanced features that you want to
enable:
– Enable IP compression
– Enable fragment before IPsec
This setting is enabled by default.
For information and guidelines on these settings, see “Advanced
IPsec Features” on page 7-21.
b. For Anti-Replay Window Size, type a value between 32 and 1024.
This setting determines how far out of order a packet can arrive and
still be accepted. See “Anti-Replay Window” on page 7-21 for more
information.
c. For DF Bit Handling, select one of these options:
– Copy DF bit from clear packet