On Wed, 2012-03-14 at 08:37 -0500, Les Mikesell wrote: > On Wed, Mar 14, 2012 at 8:25 AM, Arif Hossain <freefall1986 at gmail.com> 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 -- "You have a voice" ----The King's Speech Public Key : $ gpg --keyserver keyserver.ubuntu.com --recv-key C88CFC23 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 490 bytes Desc: This is a digitally signed message part URL: <http://lists.centos.org/pipermail/centos/attachments/20120314/f1d2086a/attachment-0005.sig>