Re: Your book says it doesn't send back anything in response to FIN

When the port is closed, the FIN packet usually receives a RST as
reply. When the port is open the FIN packet tends to be silently
discarded. This behavior depends on the implementation.

On 28 Jun 2004 16:18:28 -0000, [email protected]
<[email protected]> wrote:
> 
> 
> hi
> 
> On page 225 of Building open network... you wrote that when FIN scan sends out TCP packet with FIN flag set to a port,and if that port is open,it ussually ignores the packet.
>  But as far as I've read,when FIN (for unexisting connection)arrives on open port,it sends back RST packet
> 
> So which is it?
> 
> PS:I'd appreciate if my previous (i.e. Blocking mode) would also be answered.I received some email,but with only header and no text in the body of message
> 
> thank you and sorry for the trouble
>