The ACL (list of policy rules) is then applied to a firewall interface, either on the inbound or on the outbound traffic direction. Basically an Access Control List enforces the security policy on the network. Often this can be reduced to just known required services such as http/https.An ACL is a list of rules with permit or deny statements. allowing any internal or dmz host full access out enables nay app to do what it wants. Whilst we typically focus on what is allowed in from outside, you should also consider what is allowed out. Usually this last bit is not required, perhaps only specific hosts from example an email server might need port 25 outbound.
You have created an acl that allows the DB connection, then denies to all other internal, then permits any - presumably the last bit is because you need the entire DMZ to go out to the internet. It will not stop the inside accessing the DMZ, because that is allowed by security level and stateful inspection allows the return. So when you created an ACL and applied it to your DMZ (presumably applied it inbound to the dmz interface) it stopped the default outbound access to external. If you create an ACL and then apply it to an interface - it removes the default security level rules for that interface only. The important fact to remember is that the default security levels allow traffic from higher to lower interfaces only. These last two static NATs will be modified to OBJ-DMZ-proxy once I have the access rules figured out. Source: Inside, Destination: Outside, Source Address: OBJ-Inside-proxy, STATIC NAT TYPE, Source: OBJ-PUBLIC IP Source: DMZ networks, Destination ANY, Service ANY, Source: Inside networks, Destination ANY, Service ANY, Source: Inside networks, Destination ANY, Service ANY, (Dynamic PAT ) Source: Outside sub interface 1 "Outside" Security Level 0 - 2 Sub Interfaces for 2 ISP connections Scenario: Current ASA (5525, 9.14) configuration has the following Configuration (Simplified and abbreviated) Great! BUT I need to allow traffic from "OBJ-DMZ-webserver" to "OBJ-Inside-Database" which removes my implicit access rules. I can access the internet from my DMZ, and can connect to a DMZ server from my inside network. I already have the vlans created and trucking setup. I need to reconfigure my network to use a DMZ. Second, forgive my ignorance on how this works, I am learning so apricate the help.
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