So the answer is "Yes, it's possible to set up 1:1 NAT" here. :)
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Cisco ASA 5505 - Is it possible to setup a 1 to 1 NAT
Hi,
I have Cisco ASA 5505 and attempting to use it temporarily at our new colo until we can move over our 5510.
We have a range of 24 external IP addresses and want to map them internally to our internal servers on network 192.168.50.x. Our internal servers are a mix of multiple web application and email services. Is this possible with this device? If not is is possible to simply setup the 5505 in Transparent mode and use filters to block incoming and outgoing packets for each IP? I'm familiar with this process on a Netscreen 5GT appliance, but not sure on the Cisco.
Any help would be appreciated.
Thanks!
Kenny
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Answers
Also, you need to bind the access-list to the outside interface.
access-group outside_in in interface outside
On your access-list, if you're going to permit "tcp any" which you'll probably want to do for http or email servers, you should also think about limiting embryonic connections and setting a maximum connection limit.
For a static on an email server, especially, a good limit is 10 40. So the static would be:
static (inside,outside) x.x.x.x 192.168.50.x netmask 255.255.255.255 10 40
This would allow only 10 simultaneous embryonic connections and a maxixum of 40 simultaneous total connections to the server. Helps to prevent all kinds of common attacks and smtp compromises from the WAN. --TX
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by: jodylemoinePosted on 2009-11-02 at 09:35:13ID: 25721493
As long as you're assigning a single external IP address to each internal address, the process is fairly simple. You set up an IP NAT using the following example:
static (inside,outside) x.x.x.x 192.168.50.x netmask 255.255.255.255
Then you can control what traffic is permitted and denied with the inbound access list assigned to the outside interface. For example:
access-list outside_in extended permit tcp any host x.x.x.x eq http
In both cases, replace x.x.x.x with the outside IP address that you're forwarding.
If you're wanting to translate public IPs to private IPs, the above approach will be far more appropriate than trying to use transparent mode.