On Apr 14, 2009, at 20:38 , Bruce Lowekamp wrote:
> Many of the NATs out there you
> can not make this determination without multiple IP addresses
behind the
> NAT.
So you're right that you can test for a few more bizarre NAT behaviors
with multiple IP addresses, but I haven't seen any evidence suggesting
those behaviors are present in most NATs.
In draft-jennings-behave-test-results-04.txt (google it, it's
expired), you will note all the NATs where the Sec behavior is
different than Prim behavior in the results table are NATs where you
need more than one IP to characterize them. This includes NATs from
Airlink, Cisco, Linksys, SMC, and Toshiba. Other unpublished testing
has revealed it is many NATs from other vendors also work this way.
Cullen
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