For traffic that matches the intrazone default policy, and assuming there are no security profiles for anti-virus, anti-malware, threat protection. etc, Is there any inspection performed?
Reason I ask- I found an article on the Knowledge base about increasing performance for SMB traffic by enabling an application override for the traffic. Would application override have any effect on this traffic?
No threat scanning is performed as the default policy does not have security profiles, but app-id is performed.
If you're seing performance issues with SMB and suspect app-id, you could try to create a security policy where you enable 'Disable Server Response Inspection', which will allow you to still apply some security checks on smb (as this is a popular protocol to spread infections) but only for packets originating from the client
Or if you need to turn off app-id altogether, create an app override policy which will turn off everything for the new custom app replacing smb (app override works independently of the session hitting a custom security policy or a default one)
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