From: "Geo" 

"Mike N."  wrote in message
news:g03832lmkrcpb69m6ogt8lb24u0bb87jrm{at}4ax.com...

>    Thinking it through further, on the NAT case, we can detect a false
> test.   The odd NAT translates the spoofed address to a WAN address before
> sending it out.   So we'd see the packet come in with the real IP address.

In that case I don't think we need to worry, if for example that whole
subnet is a bunch of natted dsl customers then they already can't spoof so
BCP38 filtering for that subnet is unimportant. IE, it doesn't matter why
you can't spoof, just THAT you can't spoof.

Geo.

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