Nmap Development: Re: decoys and limiting outbound RST packets

[Martin Mačok <martin.macok () underground cz>]

On Sun, Jan 02, 2005 at 11:18:15AM -0500, Michael Rash wrote:

> > Let's say that the target sees parallel probes to same ports from
> > N different IPs (ie. decoy scan). It could divide the IPs into two
> > groups and send the response(s) to single probe just to the first
> > group and send nothing to the second. If retransmission occurs,
> > the real IP is in the second group, otherwise it is in the first
> > group.
> But the target would have no idea if the real IP is blocking its own
> outbound RST packets.
Not true. The algorithm above does not depend on RST packets. It
depends on scanner retransmitting the probe when it gets no answer.

Martin Mačok
IT Security Consultant

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