
Configuring IPsec Services
1-6
304111-B Rev 00
Figure 1-2. IPsec Concepts: Security Gateways, Security Policies, and SAs
IP00087A
Inbound process
Security associations
Inbound policies
criteria & action
(bypass, drop, log)
Outbound policies
criteria & action
(bypass, drop, log,
protect)
Outbound process
Security
policy
database
Unprotect SAs
Source/Dest Addr, SPI
Cipher Algo/Key,
Integrity Algo/Key
Protect SAs
Source/Dest Addr, SPI
Cipher Algo/Key,
Integrity Algo/Key
IPsec gateway WAN interface
Untrusted
network
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