linux box disallow incoming udp traffic ??

[Mike McGrath]

> -----Original Message-----
> From: fedora-list-bounces at redhat.com 
> [mailto:fedora-list-bounces at redhat.com] On Behalf Of M E Fieu
> Sent: Monday, August 15, 2005 4:17 AM
> To: fedora-list at redhat.com
> Subject: linux box disallow incoming udp traffic ?? 
> 
> Hi..I was playing with nmap function.  When I use nmap -sU 
> (udp port scan) to another linux machine, there is no result 
> returned.  But when using nmap (tcp port scan) is okay.  If I 
> nmap -sU on the localhost itself nmap -sU 127.0.0.1, it has 
> correct result returned.  And If I use nmap -sU to another 
> windows machine, it has correct result returned too.  There 
> is no firewall in between those host.  May I know why nmap 
> -sU can't scan another linux PC ??  
> 
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UDP behaves very differently than TCP.  Specifically what UDP ports are
you trying to scan?  Also do you know that they are not just bound to
localhost?

	-MIke