CentOS - Mar 2012 - testing a udp socket with netcat

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 put arbitrary data on the udp socket by netcat. i do not
have any experience regarding netcat so i'm asking if anyone can help me
out with this.

thanks in advance.

-- 
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                                        ----The King's Speech

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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 put arbitrary data on the udp socket by netcat. i do not
> have any experience 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.

-- 
   Les Mikesell
     lesmikesell at gmail.com

Arif,

You would want to run tcpdump (or some other sniffer() on the host server, so
that you can confirm that there is two-way traffic. If tcpdump on the host
server does not show any traffic from your client, something is blocking
inbound. If you see traffic coming into the server, but nothing returning, you
probably have issues around OSI layers 5-7. If you see a response, but you did
not see from your client, then it may something blocking return traffic.

- Rilindo 


-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On
Behalf Of Arif Hossain
Sent: Wednesday, March 14, 2012 8:25 AM
To: centos at centos.org
Subject: [CentOS] testing a udp socket with netcat

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 put arbitrary data on the udp socket by netcat. i do not have any
experience regarding netcat so i'm asking if anyone can help me out with
this.

thanks in advance.

--
"You have a voice"
                                        ----The King's Speech

Public Key : $ gpg --keyserver keyserver.ubuntu.com --recv-key C88CFC23

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