On Sun, Jun 25, 2006 at 05:41:42PM +1000, atstake atstake wrote:
> I am probing a host using OpenBSD 3.9-release's netcat.
>
> # nc -v -w 3 -z host.com 80-81
>
> If it finds port 80 open and 81 closed it sits there in an endless
> loop for about 1 minute and 10 seconds and after that it gives a
> connection time-out error.
>
> # nc -v -w 3 -z host.com 80-81
>
> Connection to host.com 80 port [tcp/www] succeeded!
> nc: connect to host.com port 81 (tcp) failed: Connection timed out
>
> there is no firewall blocking either end of the connection.
>
> How can I make this timeout a bit faster? I am already telling it to
> bail out after 3 seconds with ( -w 3 ) but seems like it is not helping.
The man page says that -w stops nc after a certain amount of inactivity;
*not* if the link doesn't come up within this time.
nc doesn't appear to have an option for this; the canonical tool is
net/nmap, which works well.
Joachim
