To create virtual interface you have to do it with subinterfaces, in other words if you are trying comeup with more logical interfaces you have to use 802.1q trunk to whicever switch you are using and create your L2 vlans in the switch pertaining to each subinterface you create in the firewall and map your switchports accordinly to proper vlans.
That is from an ASA5505 - vlan interfaces on the ASA series is only possible on the 5505. as a previous poster said, you need to use subinterfaces if you want more than the number of physical interfaces.
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...