ZyXEL P-792H v2 User Guide - Page 168
Configuring Manual Key
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Chapter 12 VPN 12.5.1 Security Parameter Index (SPI) An SPI is used to distinguish different SAs terminating at the same destination and using the same IPSec protocol. This data allows for the multiplexing of SAs to a single gateway. The SPI (Security Parameter Index) along with a destination IP address uniquely identify a particular Security Association (SA). The SPI is transmitted from the remote VPN gateway to the local VPN gateway. The local VPN gateway then uses the network, encryption and key values that the administrator associated with the SPI to establish the tunnel. Current ZyXEL implementation assumes identical outgoing and incoming SPIs. 12.6 Configuring Manual Key You only configure VPN manual key when you select Manual in the IPSec Key Mode field on the VPN Setup-Edit screen. This is the VPN Setup - Manual Key screen as shown next. Figure 75 Security > VPN > Setup > Manual Key 168 P-792H v2 User's Guide
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