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28
votes
5answers
35k views

how i can identify which process is making UDP traffic on linux?

my machine is continously making udp dns traffic request. what i need to know is the PID of the process generating this traffic. The normal way in TCP connection is to use netstat/lsof and get the ...
18
votes
10answers
3k views

Network Traffic Monitoring

What is the best tool to monitor/analyze network traffic on an entire network (several subnets)? I'm looking for something that will help me toubleshoot bandwidth problems when, for instance, users ...
5
votes
4answers
2k views

Traffic Management recommendations [closed]

What's your strategy towards traffic prioritization/management. I am not really to just get a list of packet shaping solutions. Instead, I would like to get recommendations about traffic management ...
10
votes
3answers
2k views

How to cap bandwidth usage on AWS EC2?

I'm planning to use AWS EC2 for my web application and I need control over the bandwidth usage (don't want the instances to be compromised and ramping up bandwidth cost crazily). There are many ...
12
votes
8answers
29k views

What's the best way to monitor Internet traffic for the entire office?

We currently have a T3 line for about 28 people and it gets deadly slow during the day so I need something to help track down why. I'm assuming someone is downloading something that they may not be ...
3
votes
4answers
5k views

How do I get the number of (currently) established TCP connections for a specific port?

How do I get the number of (currently) established TCP connections for a specific port? I have managed to get counters for traffic working by doing i.e for outgoing RTMP. iptables -N $CHAIN ...
0
votes
2answers
383 views

How to close certain TCP/UDP ports (incoming) for ALL networks except listed through IPTABLES

How to close certain TCP/UDP ports (incoming) for ALL networks except listed through IPTABLES. I have a small set of NETWORKS I'd like to leave THE ports to be open. But want to close for all other ...
1
vote
3answers
886 views

Linux users traffic measurement

I want to measure traffic(upload) made by each user on a linux system. Each users runs a rTorrent instance on a specified port. Also users could make traffic through the ftp server (vsftpd). Is ...
1
vote
4answers
6k views

How can I calculate the 95-percentile bandwidth usage of a network device?

My provider is billing my bandwidth using the 95-percentile method. I know what it is in principle (take measurements, throw the top 5% away and use the remaining highest as result). The question ...
0
votes
1answer
1k views

IPtables Traffic Quota - up and down

I've been trying to set up traffic quotas for users on a shared server and i believe [with my limited knowledge] that iptables --quota and ports which have been selected for each user [--dport] is the ...