Somehow my FWSM is reporting SNMP requests blocked by an ACL, despite the ACL on the interface having only the two rules that permit all IP and all ICMP. Anyone encounter this before or know what's up?
Sample logged message from an SNMP request:
%FWSM-3-710003: UDP access denied by ACL from 18.104.22.168/2468 to outside:22.214.171.124/snmp
"Some other protocols have problems with NAT. For example, SNMP network management generally does not work through a NAT point, because SNMP tools retrieve the IP addresses of devices. Since the format of the payload bearing the IP addresses is rather complex, no NAT device that I know of attempts to fix up the payload addresses. I know of a company that tried to develop code to handle this, and found it difficult..........."
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...