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Operating Systems Linux Port assignment
# 1  
Old 02-26-2015
Port assignment
Hi all,

I am currently working with SIP protocol.

I have a node that is supposed to accept SIP invite. It should be listening on udp port 35060 but is not.

Code:
Every 2.0s: netstat -an| grep 5060                                                                                                                                     Thu Feb 26 13:45:36 2015

tcp        0	  0 192.168.2.106:35060         0.0.0.0:*                   LISTEN
tcp        0	  0 127.0.0.1:35060             0.0.0.0:*                   LISTEN
udp        0	  0 192.168.2.106:35060         0.0.0.0:*
udp        0	  0 127.0.0.1:35060             0.0.0.0:*

Because of this, when I run tcpdump , I get the following;

Code:
13:41:10.603075 IP pl-1 > 192.168.2.102: ICMP pl-1 udp port sip unreachable, length 556

How can I start listening on udp port rather than tcp ?

BR
# 2  
Old 02-26-2015
UDP is connectionless, it never "listens". That it's there at all is good enough.

I suspect your client is either using a port you didn't expect, or blocked by a firewall. I am trying to figure out how to force tcpdump to print port numbers instead of service names...

What is pl-1 ?
Last edited by Corona688; 02-26-2015 at 03:02 PM..
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