I have a doubt about firewall interface ACL bypass, I understand stand that when traffic is initiated from inside to an outside server, the firewall will create a flow entry and bypass ACL check on outside interface, how about the other way around? if the traffic is initated from outside (traffic explicitly allowed on outside ACL), but inside access-list is not explicitly allowing this traffic, will the connection be established?
Thanks, that is what I thought so, I have inside ACL did not explict allow traffic to remote access SSL-VPN address pool, since remote-access VPN traffic is always initiated from client, this worked fine. But we are having strange behavior when Cisco Desktop Agent is running on SSL VPN client laptop, the agent can not see other agents, I suspected that CDA is using some ports that are not recognized to ASA, so I added inside ACL to explictly allow any IP traffic to remote SSL-VPN address pool IPs, that fixed the problem.
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...