The real question here is that since ISA doesn't use Syslog or SNMP as its standard communications protocol (it uses RPC), how will these devices integrate with MARS? Is a custom parser of any use here?
If there is a solution, are there any caveats/limitations?
I'm not sure what you mean with respect to RPC. I think ISA can log to local files, and the process that sends data to MARS is generally something that does a "tail" of the log file.
Isn't ISA mostly a firewall and HTTP proxy and socks proxy? The HTTP proxy stuff should be straight forward. My understanding is that ISA uses the W3C logging format by default. see the user guide on configuring web server devices:
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...
[toc:faq]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 and UDP are I...