ASA software order of operations

I'm trying to find a graph or something that identifies the order of operations what ASA cross when traffic passes through the appliance. I found different info already, but nothing him explained me the specific point, the decision is made to not let traffic pass interface more high level of confidence to interface low enough level of trust. When she assesses levels of security access lists? When does a decision of routing security levels.

Thanks for any info

Here is an example:

fwasa01 # entry packet - map out tcp 5.5.5.5 1024 172.16.64.101 22

Phase: 1

Type: FLOW-SEARCH

Subtype:

Result: ALLOW

Config:

Additional information:

Not found no corresponding stream, creating a new stream

Phase: 2

Type:-ROUTE SEARCH

Subtype: entry

Result: ALLOW

Config:

Additional information:

in 172.16.64.0 255.255.240.0 inside< routing="" wants="" to="" route="" the="" packet="" from="" outside="" to="">

Phase: 3

Type: ACCESS-LIST

Subtype:

Result: DECLINE

Config:

Implicit rule< outside="" interface="" has="" an="" inbound="" acl="" which="" doesn't="" mention="" "172.16.64.0"="" network,="" so="" the="" implicit-deny="" will="" drop="">

Additional information:

Result:

input interface: outdoors

entry status: to the top

entry-line-status: to the top

the output interface: inside

the status of the output: to the top

output-line-status: to the top

Action: drop

Drop-reason: flow (acl-drop) is denied by the configured rule

So to answer your question, when the packet flows of low trust in the high level of confidence it goes like this:

1 course

2. check the ACL< if="" no="" match,="" drop.="" acl="" is="" required="" if="" going="" from="" low-trust="" to="" high-trust.="" if="" no="" acl="" is="" configured,="" and="" this="" is="" inbound="" session,="" the="" packet="" is="" dropped.="" acl="" is="" not="" required="" if="" going="" from="" high-trust="" to="">

3. If nat-control is disabled (default): try to find nat/static flow correspondence or existing (there are a few things here depending on where the session initiated from), if no nat found config found, send the package without nat

3B. If nat-control is activated: there must be existing or nat/static flow

There are other components, but these are the most important

Kind regards

Roman

Tags: Cisco Security

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    Vector data

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    However, it is not recommended to overlap crypto ACL.

    Kind regards

    Aditya

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