Firewall Wizards: Re: source port specific port scan

["Steven M. Bellovin" <smb () research att com>]

In message <20011012213339.9420.qmail () web12302 mail yahoo com>, Rich Wilson wri
tes:
> Does anyone know of a port scanner that allows you to specify the source port?
>
> I'm trying to test a filter that allows outbound only SMTP.  My worry is that
> it is not stateful, and that an attacker using a source port of 25 can bypass
> the filter.
Use the -g option to nmap.

                --Steve Bellovin, http://www.research.att.com/~smb
                Full text of "Firewalls" book now at http://www.wilyhacker.com


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