Which ports are open?

25 Sep 2006

      I have set-up a range of udp ports to be opened in the firewall, but 
cannot verify if they are really open.

I thought  iptables -L |grep udp   will show me, but instead it shows:

ACCEPT     udp  --  anywhere             anywhere            udp 
dpts:ndmp:dnp
ACCEPT     udp  --  anywhere             anywhere            udp dpt:sip
LOG        udp  --  anywhere             anywhere            limit: avg 
3/min burst 5 LOG level warning tcp-options ip-options prefix 
`SFW2-INext-DROP-DEFLT '
REJECT     udp  --  anywhere             anywhere            reject-with 
icmp-port-unreachable

what does above mean?

I want to have open   udp 30000 to 31000.
How can I do it and verify?

bye

Ronald

Which ports are open?

Ronald Wiplinger