I am posing this as a question to the community, but in the latest release of app/content updates for PA, a new more focused signature was released. The new more focused signature was ms-wmi, and it was previously identified as msrpc.
So....What's the problem? The problem is that if I update content, I will essentially be blocking any ms-wmi that was previously identified as msrpc, because it was allowed under that previous signatures. This means that when I perform this update, I will be blocking ms-wmi traffic for some period of time [ how long does it take me to push policy, or craft new policy based on the new app signature of ms-wmi? ]. It seems troubling to me that this is the case, and there is no way around it. Has anyone else experienced this?
The only scenarios that I can think of to minimize the impact on the new app signatures are as follows [ in both scenarios, I am utilizing panorama ]:
Scenario 1 [ Panorama with HA pair ]:
1. Update content in Panorama to the latest release
2. In Panorama update all rules that currently have msrpc to allow ms-wmi as well.
3. Update the content/app-ids on the passive firewall.
4. Push new policy from panorama to the passive firewall.
5. Fail over to the passive firewall [ In theory this has policy which already allows the new more focused signature, so it should not disrupt current traffic or new connections ]
6. Update the content/app-ids on the firewall that is now in a passive state.
7. Push updated panorama config to the now passive firewall
8. Fail back to the originally active firewall.
Scenario 2 [ Just deal with the outage time ]:
1. Update content in panorama.
2. Add ms-wmi to all rules that are currently allowing msrpc.
3. Update content on the firewalls.
4. Quickly push policy from panorama as soon as the app/content update has succeeded. [ the ms-wmi traffic will be blocked during the period of time that the new policy is being pushed after the content update has succeeded. ]
Anyone have experience with this ?
If you properly identify (or re-categorize) your applications to include the updated signatures, I do not think you will much of an outage. On a PA-500 device, it takes about 2 minutes to push a policy down to the FW. With a faster FW, the commit process could be faster. However, in my testing with pushing down any type of policy, that it "takes effect" somewhere around the 75% mark of the commit. So in terms of outage.. that would be 30 secs or less. Not really an outage, more of a hiccup. Just my thoughts on this. Unless I misunderstood what you were trying to explain to me.
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