Best way to update app and content without impacting traffic...?

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Best way to update app and content without impacting traffic...?

Hello All,

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 ?

Thanks,

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Re: Best way to update app and content without impacting traffic...?

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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