So your are using 5 (all available 32-bit/33 MHz) and one 64-bit/66 MHz
In other words you have free 3 64-bit/66 Mhz buses
A)You want to add 2 FE - so you need place those cards to 64-bit/66 MHz
Cisco says to this option :" If more than five 33 MHz cards are needed, they may be installed in a 64-bit/66 MHz bus, but doing so will lower that bus speed and limit the potential throughput of any 66 MHz cards installed in that bus.....
B)Cisco has two GE cards
PIX-1GE uses 64-bit/33 MHz
PIX-1GE-66 uses 64-bit/66 MHz
PIX-1GE is same issue like using 33 Mhz card in 66 Mhz bus....
PIX-1GE-66 uses 64-bit/66 MHz so no problem with installing to 64-bit/66 MHz
So all options are possible but i recommend to add two PIX-1GE-66 cards
Actually, slots 0 to 1 and slot 3 which are 64-bit/66 MHZ are still free.
I'm thinking of using those 64-bit/66MHZ slots for the for either option. My worry is not the throughput of the interfaces but the burden to the CPU usage or RAM memory (1GB). Normally the CPU usage is about 30 to 35 percent.
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...