BCP38 tester?

Mon Apr 1 08:02:40 UTC 2013

On Mon, 2013-04-01 at 01:31 -0500, Jimmy Hess wrote:
> On 3/31/13, Karl Auer <kauer at biplane.com.au> wrote:
> > OK - how does one configure NAT so that the source addresses of outbound
> > packets are NOT clamped to a configured range on the outside of the NAT
> > device? Given this general scenario, of course:
> 
> He said it depends on how NAT is configured
> [...]
> In some implementations, only certain ranges of source IP addresses
> are subject to translation.

Um - if no address translation takes place, then, by definition, NAT has
not taken place.

So it may well be that a particular device, capable of doing NAT and
other things, of NATting some packets but not others, may permit
spoofed-because-not-NATted outbound packets, but I remain unconvinced
that a spoofed packet can make it through a NAT process and head
outbound without getting its source address clamped to a configured
range of outside addresses.

Now I'm imagining a NAT process that translates only *destination*
addresses - hm, is there such a beast?

Continuing to seek enlightenment...

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

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