My Events on my IPS sensor within my ASA5520 are primarily Sig ID 3030's. I am relatively new to the IPS/IDS Sensor end have always looked at Host Sweeps as sort of an attempt of attack. These entries almost look like normal internet traffic from users going to google, etc....
Can someone please shed some light on how to understand the logs and good vs. bad, etc.?
There is not a sweeping answer on how to determine what is good or bad in your network; each network has different characteristics on which to make this determination. Hence, investigating the sources and destinations of the signature event is the best start. From there, you could capture traffic between the hosts to see what is actually occurring (making use of IP logging on the sensor for a specific signature is a great troubleshooting tool - just be careful not to leave it enabled full-time like a packet sniffer). Reviewing these captures can let you know whether to consider the traffic good or bad.
Internal hosts can cause this signature to fire for normal web browsing activity; that is why internal hosts are listed as a potential benign trigger. he event action filter is a recommendationto assist in lowering false positives from needing to be reviewed.
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...