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[EOL/EOS] What is the Policy check sequence for a packet?

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Article ID: KB7821 KB Last Updated: 31 Mar 2021Version: 4.0
Summary:
Note: A product listed in this article has either reached hardware End of Life (EOL) OR software End of Engineering (EOE).  Refer to End of Life Products & Milestones for the EOL, EOE, and End of Support (EOS) dates.

Packets denied by global policy
Symptoms:

Customer is unable to send packets from one interface to another, although both of the interfaces are in the same zone with intra-zone block turned off.  In addition,  a global deny policy has been defined on the ScreenOS device.

Solution:

The Policy look-up sequence for a packet is:

Step 1. Look for a policy between the ingress and egress zones
Step 2. If no policy is found (in step 1), search for a Global policy
Step 3. If no Global policy  is found and if the ingress zone is same as the egress zone, apply the intra-zone block
    i.e if intra-zone block is enabled, drop the packet otherwise permit.

In summary,  if there is no intra-zone policy and there is a Global DENY policy, whether intra-zone block is enabled or not, the ScreenOS device will match the Global policy and drop the packet.

To allow such traffic, define an intra-zone policy.

Modification History:
Article is reviewed for accuracy
03/27/2021 - Replaced term NetScreen with ScreenOS 
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