Re: iptables REJECT types for UDP (if any)

On Thu, Nov 21, 2002 at 12:15:27PM +1300, Simon Byrnand wrote:
> At 18:01 16/11/02 +0100, Miguel Angel Rodríguez Jódar wrote:

A scanner checks the UDP ports by sending a packet if there is no answer it assumes that the port is open (if the machine is up) it is closed if there is a "port-unreachable-ICMP" message (as far as I understood the scanners)

For TCP a scanner can differentiate between OPEN, CLOSED and FILTERED ports by the message that is comming back (or not comming back)...

have a nice day
Pierre

> Regards,
> Simon
>
Received on Wed Nov 27 12:13:20 2002