Restrict certain IP addresses for establishing IPSec
Is it possible on Cisco ASA 55xx to restrict (to filter) certain public IP addresses which would be THE ONLY addresses able to establish Remote Access IPSec VPN using Cisco VPN client? Let's assume that Cisco VPN client establishes VPN connection from fix public IP address (always the same).
So, I am not talking about ACL actions on VPN traffic. I'm asking about establishing IPSec tunnel and preventing some public IPs of even trying that.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
[toc:faq]Introduction:This document describes details on how NAT-T
works.Background:ESP encrypts all critical information, encapsulating
the entire inner TCP/UDP datagram within an ESP header. ESP is an IP
protocol in the same sense that TCP and UDP are I...