On Wed, 2012-03-14 at 08:37 -0500, Les Mikesell wrote: > On Wed, Mar 14, 2012 at 8:25 AM, Arif Hossain <[email protected]> wrote: > > i've this udp daemon which is waiting for an incoming udp datagram. now > > i want test this daemon for random garbage to test how it behaves. My > > udp daemon is running because its shows on netstat. problem is if i > > issue following command for putting udp datagram : > > $nc -uvvz <host> <port> > > > > it does not output any thing. i have straced the udp daemon. which does > > not returns from recv() call. > > > > my goal is to ppience regarding netcat so i'm asking if anyone can help me > > out with this. > > Do you have iptables running? The default config would probably > block your udp traffic. >
here is my iptable-rules
# Generated by iptables-save v1.4.7 on Wed Mar 14 19:58:13 2012
*mangle
:PREROUTING ACCEPT [329554:95268521]
:INPUT ACCEPT [88918:46924677]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [7296:1924138]
:POSTROUTING ACCEPT [7296:1924138]
COMMIT
# Completed on Wed Mar 14 19:58:13 2012
# Generated by iptables-save v1.4.7 on Wed Mar 14 19:58:13 2012
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [206514:24743648]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport <port> -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Wed Mar 14 19:58:13 2012
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