Nmap Development: Re: Nmap ICMP/TCP Ping Insubordination

[Fyodor <fyodor () insecure org>]

On Mon, Jun 07, 2004 at 12:48:58PM +0300, Noam Rathaus wrote:
> >
> Also, I noted that it still creates an ICMP capture filter under root, which 
> would in the case of -PT/-PS/etc be unnecessary, unless that host is 
> non-routeable.
[ cut ]
> Packet capture filter: (icmp and dst host 207.46.245.92) or (tcp and dst host 
> 192.117.122.128 and ( dst port 62241 or dst port 62242 or dst port 62243 or 
> dst port 62244 or dst port 62245))
>
> As you can see it still tries to use ICMP for detection, if I read it 
> correctly.
Nmap does this because the host may respond to a TCP packet with an
ICMP packet (such as port unreachable, several host unreachable types,
including prohibited by firewall, or network unreachable).

Cheers,
Fyodor

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