By default, the security appliance allows IPsec packets to bypass interface access control lists (ACLs). In order to allow specific traffic for a VPN tunnel, apply interface access lists. Complete these steps (apart from the basic VPN configuration) on the PIX/ASA:
1. Use the no form of these commands in order to disable sysopt connection permit-ipsec on PIX version 6.3 and sysopt connection permit-VPN on PIX/ASA version 7.x.
2. Create an access-list for traffic that goes into the outside interfaces. Refer to this access-list example in order to allow only Telnet traffic:
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...
Table of Contents 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 an...