On Fri, Nov 6, 2009 at 5:30 AM, Craig White
<craigwhite@azapple.com> wrote:
On Fri, 2009-11-06 at 13:13 +0000, Marco Savo wrote:
> Hello,
> configuring iptables rules,
> how I can find out if one port number I want to use is already in
> use?
> example:
>
> $IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol udp
> --dport ${UDP_PORT} --destination localhost
> $IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol tcp
> --dport ${TCP_PORT} --destination localhost
> $IPTABLES -t nat -I zone_wan_prerouting 1 -j ACCEPT --protocol tcp
> --dport ${TCP_HOST_PORT} --destination localhost
>
> How I can check if these ports (UDP_PORT TCP_PORT TCP_HOST_PORT) are
> in use from another application?
----
you can use netstat - for example, I might check for port 10000...
# netstat -an|grep 10000
tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN
udp 0 0 0.0.0.0:10000 0.0.0.0:*
Craig