Nmap Development mailing list archives

Feature request, out-of order fragmentation


From: Sam Lavitt <sam.lavitt () gmail com>
Date: Fri, 14 May 2010 12:44:48 +0300

I have recently found myself working with a commercial firewall and
IDS that is unable to screen fragments that are delivered out-of-order
when under load (normally it will store until the fragments unil the
entire window arrives, but once it hits a preconfigured load
percentage, default 0 (so always), it will forward all fragments as
delivered after checking the individual fragment for payload.)

As a result, I'd like to see a feature for fragmentation and
transmission of packets out of order with a slight delay to make it
more likely for out-of-order delivery, leaving the host to reassemble
them.  This would effectively evade the product.
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