inside out 1 hide nat mode

Hello

I'm new to configurations of ASA and who need help with Setup on an execution code 8.6 X 5555. I need allow network several ip address ranges from my inside several subnets outside the network so that external systems only see traffic entering an ip address and may not be the ip address of the external interface. I was able to do this with a box and statements IOS nat-based firewall but difficult to do the same in the bones of the ASA.

Hello

Sound is fairly simple and fast, for your condition, you should use.

http://www.Cisco.com/c/en/us/TD/docs/security/ASA/asa84/configuration/guide/asa_84_cli_config/nat_overview.html#wp1114283

Information on PAT Dynamics

Dynamic PAT translates multiple real addresses to a single IP address mapped by translating the port real, address and source, the mapped address and a unique port. If necessary, the actual source port number is used for the mapped port. However, if the actual port is not available, by default mapped ports are selected in the same range of ports than the real port number: 0 to 511, 512 to 1023 and 1024 to 65535. Therefore, ports below 1024 have only a small PAT pool that can be used. (8.4 (3) and later, not including 8.5 (1) or 8.6 (1)) If you have a lot of traffic that uses the lower ranges of port, you can now specify a flat range of ports to use instead of the three levels of unequal size.

Each connection requires a separate translation session because the source port is different for each connection. For example, 10.1.1.1:1025 requires a separate 10.1.1.1:1026 translation.

Figure 27-10 illustrates a typical scenario of PAT dynamic. Only real hosts can create a session of NAT, who answered the questionnaire of traffic is allowed to return. The mapped address is the same for each translation, but the port is assigned dynamically.

Figure 27-10 dynamic PAT

After the expiry of the connection port forwarding expires after 30 seconds of inactivity. The timeout is not configurable. The destination network users may not reliably initiate a connection to a host that uses PAT (even if the connection is allowed by an access rule).

Understanding of NAT

https://supportforums.Cisco.com/document/132066/ASA-NAT-83-NAT-operation-and-configuration-format-CLI

Let me know if you need help on this, you can do PAT with additional IP addresses that are available on outside interface. You must have appropriate for the additional ip address routing

HTH
Sandy.

Tags: Cisco Security

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