Hi, I have FWSM and IDSM/2 module on 6500 switch in my network, and we have issue with file transfer between some machines. When server is behind IPS, transfer is very slow, 40x lower then in situation when server is only in VRF/FWSM - without IPS. Any idea? Thanks in advance
an overworked sensor can certainly be a cause of problems. The easiest way to determine you sensor's health is to look at the % missed packets and CPU utilization from the CLI:
sh int (%missed pactets)
sh stat host (CPU)
If those don;t look like the cause of your problem, a likely cause is the normalizer engine sigs. These sigs will drop packets it doesn't like and not give you an alert. Check what sigs are fireing when you're experiencing this problem:
show event past 01:00 | include (whatever you're looking for)
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...