I agree that because this is a security appliance, the least amount of non-essential services running is best.
However, in certain situations, it seems to me an NTP might be a good idea. For example, in small businesses with limited budgets, a GPS/RF NTP server is often not justifyable and instead, since the PIX obtains its time (if configured) from Internet NTP servers, why not setup the PIX NTP server onto the inside interface?
I am not familiar with this enough to say for sure if security would be compromised by such. However, I would tend to prefer not having to open ports to let NTP traffic through the PIX.
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...