*my apologies for the re-post if applicable*

You may want to give unicornscan a try if you haven't already:
http://www.unicornscan.org/

From the man page:

[-B, --source-port Port]
Source port for sent packets, numeric value -1 means to
use a random source port (the default situation), and other valid set-
tings are 0 to 65535. normally this option will not be
used, but sometimes it is useful to say scan from port 53 into a
net-
work.

On Thu, Aug 21, 2008 at 3:00 AM, Alexander Sandström Krantz A
<alexander.a.sandstrom.krantz (at) ericsson (dot) com [email concealed]> wrote:
>
> Is it possible to automatically alter the source port when using Nmap to test a firewall? It would be very nice if it was possible to provide a port range instead of one single source port, even though I realise that such as scan would take a long time to execute. Anyone knows of any patches for Nmap that allows a source port range to be provided?
>
> If not, do you have any other suggestion on what application to use to perform a more comprehensive firewall test?
>
> Thanks,
> Alexander
>
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