Manual Key Setup; Security Parameter Index (Spi) - ZyXEL Communications P-2612HW-F1 User Manual

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14.5 Manual Key Setup

Manual key management is useful if you have problems with IKE key

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.

P-2612HW-F1 User's Guide

Chapter 14 VPN