On Mon, Aug 31, 2009 at 08:59:32AM +0900, Anthony G. Nickolayev writes:

>> Is it possible to specify source interface for callout check?
> Be carefull with sender callout verification. Take a look at this
> http://www.backscatterer.org/?target=sendercallouts

Thank you.
And what about resolving sender domain? Sending icmp echoreply, 
icmp unreachable? Sending 25/tcp synack? ;-)
All this things can be used for DDoS-attacks.
I don't agree with the backscatterer.org point about callout.

-- 
Pavel

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