Hi, I'm running IOS FW/IPS/VPN on a 2651XM (IOS: 12.4.9T). I'm currently using SDM (2.3.1) to customize the SDF files but it's extremely slow. I basically download the latest signatures, then replace the ones loaded on the router with the new ones - it takes forever though and I have to manually click to select every single signature that I want to add. I'd love to be able to select entires categories. Here are my questions:
1. Are there better tools out therefor editing SDF files? If so, what are they (preferably open source)
2. Why are some of the signatures disabled by default?
Also, I replaced the signatures on the router with my own, then went back to one of the old files but for some reason, some of the old signatures that used to load fine aren't working. When I reload the router it displays messages like this:
%IPS If present in future SDFs, it will not be loaded.
Use the 'no' version of this command to change this behavior.%IPS Signature 9523:0 is not currently loaded
After that, when I run "show ip ips all", I can see that only 338 of the 382 signatures are active.
I'm using the "ip ips sdf location" command to specify which file to load on startup. All 382 sigs used to load in the past. What am I doing wrong?
I can answer some of your questions. By default, not all signatures are enabled. Only certain signatures that capture well known attacks are enabled. The network administrator can enable/disable signatures depending on the environment. Also some of the signatures may not load correctly if any of the signature engine paramaters do not match.
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...