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Old 05-28-2014, 09:37 AM   #1
Registered: Apr 2013
Posts: 47

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Get UDP Active Connections


I'd like to know how I could get every IPs connected to a UDP service.
I've been trying through Netstat wich throws:* as the connected IP.
Thanks for your help.

P.S: The server is running on Ubuntu 12.04.
Old 05-28-2014, 09:59 PM   #2
Registered: Feb 2013
Location: San Jose, CA
Distribution: RHEL/CentOS/Fedora
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UDP is stateless, and therefore you cannot get state information like "connected" or "unconnected". You could track the traffic going in and out using tcpdump or some other traffic analyzer.

ss -u -pa will list all sockets
netstat -u will show all listening processes, and connected processes, but not a foreign address
lsof -iUDP will show more info, but yet again-no foreign addresses

There's not much you can do for UDP, I don't think.
Old 05-30-2014, 05:19 PM   #3
Registered: Oct 2007
Location: BC, Canada
Distribution: Fedora, Debian
Posts: 210

Rep: Reputation: 41
You could use iptables and create accounting rules on the INPUT chain to track incoming UDP connections.


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