Order of procedure SonicWALL for routing, NAT and policies

I'm confused on the prescription that the sonicwall verifies a package.  The way I heard the order, it will:

(1) check against the access rules,

(2) check against NAT Polies

(3) check the routing.

Installation program:

Subnet point of VPN endpoint - Internet - SW NSA 2400 (VPN) - sub-network B (from C subnet)

A subnet is 10.1.100.x/24

Subnet B is consists of three IPs, 192.168.99.4,.50, and 109.

Subnet C is contains the host IPs 192.168.13.4,.50, and 109.

I VPN configured to allow traffic from 10.1.100.x to the hosts on the subnet B, what NAT and the host subnet C.  This method works more large, is not a problem.

I need to reduce access to certain ports.  Once I set access restrictions in the port, the firewall blocks ALL.

When I look at a screenshot of packets when traffic is blocked, I see the following:

Source 10.1.100.5--> 192.168.99.4 accepted

Source 10.1.100.5--> 192.168.13.4 refused.

Block of code indicates that it is because of politics.  However the policy review should have been checked and checked already.  If I change the VPN policy to represent both sides of the NAT (ie. 192.168.99.4 and 192.168.13.4) then passes the traffic.

If anyone can explain what is happening?

I tried to look through some KB SonicWall has publicly available articles. But I did not see anything that doesn't seem to help. In this case, I think you might want to give SonicWall support a call.

https://support.software.Dell.com/manage-service-request

They can help to look over your configurations and see if we have to make changes. They should also be able to answer your technical questions about how the packets are received or managed.

Tags: Dell Tech

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