Izgleda da je to nekakav Network Authentication Tool (NAT) I mislim da se to ne treba prevoditi, tj, ostaviti nesto kao NAT odobrena ili certifikovana aktivnost

You can enable Basic Firewall for any public interface, including one that also provides network address translation (also known as NAT, an Internet Protocol (IP) translation process that allows a network with private addresses to access information on the Internet for your network).
http://www.computeruser.com/blogs/blogViewDetails/a3fbe8c586...
EnableNAT = { 0 | 1 }
Specifies whether or not to enable secure transmission between a VPN client and a VPN device through a router serving as a firewall, which might also be using the NAT protocol.
•0, the default, disables IPSec through NAT mode.
•1 enables IPSec through NAT mode.

http://www.cisco.com/en/US/products/sw/secursw/ps2308/produc...
http://www.isaserver.org/tutorials/Allowing-Inbound-L2TPIPSe...



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Note added at 22 hrs (2009-06-15 19:05:34 GMT)
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Moguce da je to to jer ja sam samo pretpostavila da je skracenica od NAT net.authent. tool. U svakom slucaju mislim da se moze ostaviti NAT jer se i iz primjera vidi da se to tako upotrebljava