Re: Blocking Port scans

["Terry Vernon" <tvernon24 () comcast net>]

a person should never have initiated a handshake wwith every socket on the 
machine in a short period of time. only portscans do that. find or build a 
tool to watch for this and problem semi-solved

Terry Vernon
CTO/Senior Developer
Sprite Technologies

----- Original Message ----- 
From: "BSK" <bishan4u () yahoo co uk>
To: <pen-test () securityfocus com>
Sent: Monday, October 24, 2005 6:34 AM
Subject: Blocking Port scans


> Hello Everyone,
>
> Just wanted some feedback from you people. I'm doing a
> Firewall Assessment for a CISCO PIX firewall. The
> firewall allows SYN, FIN, NULL and XMAS scans but
> blocks ACK scans (largely means its a stateful
> firewall).
>
> Now what do we do to block the scans that are allowed.
> I think it should be easy to block FIN, NULL and XMAS
> scans but how do we block or limit or workaround a SYN
> scan. 1 way that I think is probably blocking or
> limiting  the packets from the source (using IDS/IPS)
>
> Looking ahead to some ideas, thoughts, hints.
>
> thns bshan
>
>
>
>
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