nmap is probably the best for the price (it's free).  And your money is 
cheerfully refunded if you are dissatisfied.  It's found at:

http://www.insecure.org/nmap/


-- Joe

At 01:16 PM 2/14/00 -0500, Ivan Fox wrote:
>We are contemplating to scan our firewalls, FW-1 for NT, on a regular basis
>to find out and alert us what ports are opened.  We plan to scan on both
>interfaces of a firewall.
>
>Is it a good idea?  What tool(s) are available?
>
>Any pointers are appreciated.
>
>Ivan
>
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