ASA inside access DMZ and return
Hi Expert,
How configure ASA to allow access from the inside to dmz host and also back?
Thank you.
Rgds,
To the Shaw feel Yeong
Hello
By default, access from inside the DMZ is permitted this access is through higher security level to lower the level of security.
Return to inside host traffic is automatically granted by ASA/firewall if the connection / translation is valid / exists.
Example:
Inside of the intellectual property: 192.168.1.1/24
DMZ: 172.16.1.1/24
2 two ways to do:
a. use nat & global command:
Global (dmz) 1 172.16.1.10 - 172.16.1.20--> help de.10 a.20 will be used inside hosts to access dmz
Global (dmz) 1 172.16.1.21--> all inside will use this IP like PAT, if the above range is fully used.
NAT (inside) 1 192.168.1.0 255.255.255.0
Note:
-Use the ACL if you need to control the type of service to pass through and apply on the inside of the interface.
b. static use of translation between inside and DMZ subnets:
static (inside, dmz) 192.168.1 192.168.1.0 netmask 255.0.0.0
Note:
-This will allow inside the host to initiate & access dmz and dmz to initiate & access to the inside (initiate connection to dmz host). When DMZ accessing inside the host, DMZ use inside physics/assigned host IP.
-Use the ACL if you need to control the type of service for cross and apply on time interfaces dmz & Interior.
Example of configuration:
* Watch under command "static (inside the dmz).
Rgds,
AK
Tags: Cisco Security
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