On Wed, 2012-03-14 at 14:11 +0000, Giles Coochey wrote: > --------------ms000000020507030501060609 > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > Content-Transfer-Encoding: quoted-printable > > On 14/03/2012 13:59, Arif Hossain wrote: > > On Wed, 2012-03-14 at 08:37 -0500, Les Mikesell wrote: > >> On Wed, Mar 14, 2012 at 8:25 AM, Arif Hossain<freefall1986@xxxxxxxxx> = > wrote: > >>> i've this udp daemon which is waiting for an incoming udp datagram. n= > ow > >>> 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 do= > es > >>> not returns from recv() call. > >>> > >>> my goal is to ppience regarding netcat so i'm asking if anyone can he= > lp 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 > > > And your INPUT chain rejects everything that is not matched by those=20 > lines above it. > > You'll need a: > > -A INPUT -p udp --dport <port> -j ACCEPT in there before you go to REJECT= > =2E > > --=20 > Best Regards, for testing purpose i have flushed all rules in iptables -t filter $iptables -t filter --flush but still if try putting data by nc: $nc -uvv localhost 7160 outputs : write error: connection refused. > > Giles Coochey > NetSecSpec Ltd > UK Mobile: +44 7983 877 438 > Business Email: giles.coochey@xxxxxxxxxxxxxxxx > Email/MSN/Live Messenger: giles@xxxxxxxxxxx > Skype: gilescoochey > > > > --------------ms000000020507030501060609-- > _______________________________________________ > CentOS mailing list > CentOS@xxxxxxxxxx > http://lists.centos.org/mailman/listinfo/centos
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