Cisco RV016 Administration Guide - Page 183
IPSec NAT Traversal, Overview
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E IPSec NAT Traversal Overview Network Address Translation (NAT) traversal is a technique developed so that data protected by IPSec can pass through a NAT. Since IPSec provides integrity for the entire IP datagram, any changes to the IP addressing will invalidate the data. To resolve this issue, NAT traversal appends a new IP and UDP header to the incoming datagram, ensuring that no changes are made to the incoming datagram stream. In the following scenario, Router A initiates IKE negotiation, while Router B is the responder. RV042 WAN: 192.168.99.11 NAT 2 LAN: 192.168.111.1 RV016 WAN: 192.168.99.22 Router B - Responder LAN: 192.168.2.0/24 RV042 WAN: 192.168.111.101 NAT 1 LAN: 192.168.11.1 RV016 WAN: 192.168.11.101 Router A - Initiator LAN: 192.168.1.0/24 192.168.2.100 199787 192.168.1.101 Cisco Small Business RV0xx Series Routers Administration Guide 183