Nmap Development mailing list archives

Re: Fragscan not working?


From: Michael Pattrick <mpattrick () rhinovirus org>
Date: Thu, 8 Apr 2010 01:23:23 -0400

On Thu, Apr 8, 2010 at 1:02 AM, Fyodor <fyodor () insecure org> wrote:
On Wed, Apr 07, 2010 at 06:49:40PM +0000, Brandon Enright wrote:
On Wed, 7 Apr 2010 09:55:59 -0500
Ron <ron () skullsecurity net> wrote:

I seem to have a different problem.  My scans work and I get responses
back with -f but a quick look with tcpdump shows my packets aren't
fragmented.  I'm running 2.6.31 mostly vanilla.

If I add --send-eth I do see the fragments go by and the scan also
works.

I suppose -f should probably imply --send-eth, at least on Linux.

I'm not sure if Linux always does that.  Here is what the man page
entry for -f says about the issue:

What would be the motivation not to imply --send-eth where possible on
Linux fragmentation scans?

-M
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