TMS zl Management and Configuration Guide ST.1.1.100226

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Virtual Private Networks
Configure a GRE over IPsec VPN with IKE
11. To enable the keepalive feature for the GRE tunnel, select Enable
Keepalive.
a. For Period, type the interval, in seconds, between sending keepalives.
This interval can be a short as 1 second or as long as 3600 seconds (1
hour).
b. For Retries, type the number of keepalives that the TMS zl Module will
send before declaring the tunnel “down” (1-255).
Figure 7-175. Add GRE Tunnel Window
12. Click OK.
The tunnel is now displayed in the VPN > GRE > GRE Tunnels window.
Figure 7-176. VPN > GRE Window (Tunnel Added)