Questions tagged [tc]
TC is the linux tool used to manipulate the traffic control functionality in the kernel.
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tc qdisc tbf - calculate sensible latency and burst from rate
I want to create a simple script that lets me limit the outgoing speed of an interface somewhere between 56k (modem speed) and 1MBit/s. I found that something along the following does the job:
tc ...
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Traffic shaping outbound clients source ip with tc / iptables
My question is I am trying to limit a users bandwidth on a server and wondering the best way to do this. Before I dive to far into the tc/iptables I was wondering if I could get any advice on this ...
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How to change give highest priority to Mail traffic on port 25 with tc
How can I give the highest priority to mail traffic on port 25 whit tc?
I tried prio option but It didn't work out for me or maybe I'm missing something.
I'd appreciate any help.
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Linux Traffic Controller (Linux tc): hierarchical token bucket (htb) packet queue size
In my Linux router, I am using the following configuration to limit the rate of traffic towards port 44444 of a client in the LAN (client address is 192.168.10.2, connected through the router's eth1 ...
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tc-qfq is classless error
I'm using Linux 3.0.101 with iproute2-3.4.0 on a router and I'm getting this error:
tc qdisc add dev eth2.2 root handle 1: qfq
--> OK
tc class add dev eth2.2 parent 1: classid 1:10 qfq weight 1
--...
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Debian7 and tc qdisc issue : RTNETLINK answers: No such file or directory
I've been searching for few days now but couldn't find the solution to my problem.
I have a VPS running Debian 7, and I have root access.
I am trying to add some traffic shaping (using HTB), so the ...
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Is there anyway to tell what user will receive data from inbound packet?
In linux, considering this use case:
1. User initiates http request for webpage to remote server
2. Remote server answers request and sends packets
Is there any reference to the user who started ...
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How to test if packet has been tagged with classid
I'm trying to troubleshoot an issue I'm having related to IFB Mirroring which I'm attempting to deploy based on this question: Tc: ingress policing and ifb mirroring
My theory is that since the ...
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linux tc htb bandwidth ceil being ignored and giving improper results
I'm setting up some htb packet queues like so:
tc qdisc add dev eth0 root handle 10: htb
tc qdisc add dev eth1 root handle 10: htb
tc class add dev eth0 parent 10: classid 10:1012 htb rate 750kbps ...
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Group traffic shaping with traffic control?
I'm trying to limit the output bandwidth generated by an application with linux tc. This application sends me the source port of the request that I use has a filter to limit each user at a given ...
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Is it possible to limit output bandwidth between eth0 and lo?
I'm trying to limit the bandwidth between my eth0 output (nginx proxy) to my loopback inteface (apache) by filtering on destination port.
Incoming Packet -> Eth0 -> 0.0.0.0:80 Nginx -> tc ...
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Trouble using net_cls control group in tandem with tc for packet filtering
I'm having some trouble limiting network bandwidth using the net_cls control group in conjunction with the linux traffic controller (tc). I think I might just be confused about how I'm writing the ...
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Trying to understand HTB subclasses rate
I'm currently studying the opportunity of using an Ubuntu server to provide QoS instead of my consumer-class router. I've read a lot of resources about tc and HTB queuing disciplines - which look to ...
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HTB equal bandwith sharing per ip in one class
In my tc configuration (shown below) in one class all bandwidth is shared among connections equally, but I want to share bandwidth among all IP addresses equally.
Now:
192.168.0.2 - 38KB/s
192.168.0....
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Implementing HTB, NetEM, and TBF traffic control simultaneously
I am working on a bash utility that will use several aspects of the tc Linux command line utility to emulate various network conditions. I have successfully constructed several qdisc hierarchies, one ...
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Limit monthly traffic per interface
I'm trying to deploy an application for a limited monthly traffic.
Please can you tell me how can I do this ? I need to limit traffic on an interface under linux.
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Bandwidth Throttling using tc qdiscs
I am trying to limit the bandwidth between a simple iperf server and client, using a third, passive machine acting as a bridge. With no interference, iperf returns a bandwidth of ~90 Mbits/sec. My ...
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How to slow down and share incoming network traffic using TC (traffic shaping)
I am trying to slow down incoming packets for a specific program, while a second one will have full access to the unused bandwidth. In other words, I want to control the network bandwidth sharing in ...
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Meaning of requeues of tc command
I ran this tc bellow and it outputs requeues with high number, do you know what this requeues means? By the way, it keeps increasing over the time.
I look at man tc but I couldn't find anything.
$ ...
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Openvpn limit bandwidth
I would like to ask you a question concerning openvpn and the possibility to increase the bandwidth in case I want to transfer files.
I have an openvpn server via which I connect to my data center. ...
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packet loss only on Tx using tc(Traffic Control) in Linux
I'm aware that one can introduce packet loss in a Linux machine using tc. For example:
tc qdisc change dev eth0 root netem loss 10%
However, is it possible to specify a traffic direction where the ...
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How can I limit the upload/download bandwidth on my CentOS server?
How can I limit the upload and download bandwidth on my CentOS server? This is a box with a single interface, eth0.
Ideally, I would like a command-line solution (I've been trying to use tc), ...
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Is It Possible to Attach multiple Ports to a TC Filter?
I need to limit the bandwidth/rate by ports, and as a server there would be thousands of ports. Due to the limit of tc filter, I wonder if it is possible for multiple discreate ports to share a same ...
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How Many Filters Can We Have -- LINUX QOS
I am doing Qos on Linux server using TC. According to the grammar of tc tool, the handle of a filter must be between 800::001 and 800::FFF. And because 0XFFF equals 4095 in decimal, so we can only ...
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Why Parent Class In a TC Rules Tree Not Working
The parent class in my TC rules script doesn't work as it garanteed! Can somebody tell me what is wrong with my script? Here are some details about my question:
From the chapter "9.5.4.4. Sample ...
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Why This TC Script Not Working
Our application has three classes of traffic, and every type of traffic involves three ports. We want to limit the traffic by port number via TC, so I made a simple TC script to have the test, however ...
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Linux qos: tc DRR qdisc does not work
There is tc queue discipline DRR(Dificite Round Robin) .
It has same capabilities, as HTB, but instead of using buckets, filled with tokens, it just assignes every queue some Dificit Counter. On ...
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What do these two QOS script statements mean
I am studying the QOS utility of Linux -- TC -- recently, and today I encountered below two statments from a bandwidth-limit script on Linux:
tc filter add dev eth0 parent 1: prio 1 protocol ip ...
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Can TC limit bandwidth by the Qos field of IP header
We are developing a client/server applications. There are three types of network data in our server app: Realtime data such as those of Video/audio, Critical Data such as those of Database data and ...
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Shaping of outgoing traffic in linux for channel with unknown width
Is there any way to divide outgoing channel between different traffic class, for example, with relation 30/70, if I don't know channel width? HTB requires exact numbers, and CBQ too.
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TCP packet filter based on TCP sequence
I need to build a test environment with a very precise packet loss based on specific TCP sequence or, optionally, on payload content. I couldn't figure out how to do it with tc or iptables. What tool ...
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Can TC (Linux Qos Utility) limit bandwidth usage of target applications?
We have many applications running on the same server machine which is inside a network of servers. We want limit the bandwidth of our applications to specific value. So here are some choices: ...
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How can we set variable throttle bandwidth values using tc?
I'm building a network application and need to test its behavior under various bandwidths.
This question is an offshoot of this question. I was successfully able to test my application for different ...
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tc filter replace, tc filter change doesn't work
I have a tc filter rule:
tc filter add dev eth0 protocol ip prio 1 u32 match ip dst 10.0.0.3 flowid 1:14
if I try to 'change' this filter rule I get an error:
# tc filter change dev eth0 protocol ...
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How to add delay to incoming traffic?
For purpose of continuous testing, I would like have apache server to serve static files with at least 20ms delay.
I tried to find a apache configuration setting or a plugin with similar ability, but ...
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Linux Traffic Control: qdisc mq
On my Linux system I see this:
# ip link list
....
2: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT qlen 1000
....
What's qdisc mq? In http://lartc.org/lartc....
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VLAN based rate limiting using tc
I have been trying to perform VLAN based rate limiting on an academic project I am working on. The project uses Openflow (with Beacon controller) and the network is emulated using Mininet. The network ...
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Resetting a queue discipline back to the default pfifo_fast one?
I'm trying to temporarily set a rate-limited queue discipline and then remove it a bit later:
# /sbin/tc qdisc add dev eth1 root tbf rate 600kbit latency 50ms burst 1540
# /sbin/tc qdisc del dev eth1 ...
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how to limit upload bandwidth per user in linux?
Can anyone provide the tc command to limit upload bandwidth per user in Debian Lenny?
I found that to mark packets per user with iptables I can use the following command
iptables -t mangle -A OUTPUT ...
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Limiting bandwidth on internal interface on Linux gateway
I am responsible for a Linux-based (it runs Debian) branch office router that takes a single high-speed Internet connection (eth2) and turns it into about 20 internal networks, each with a seperate ...
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htb with an inner gred how to setup filter to reach DPs
I want to create a qos htb class and within this class there is a gred queue.
how do I add a working filter for each red queue in the gred queue?
what i tried was:
DEV=lo
SOMEGREDETTINGS="limit ...
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lxc bandwidth control using tc
I am trying to restrict bandwidth inside my containers.
I have tried using the following commands , But I think it is not getting effective.
cd /sys/fs/cgroup/net_cls/
echo 0x1001 > A/net_cls....
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tc rules block traffic from some hosts at network
I have a problem I can not solve.
The script, which sets the rules for traffic shaping is blocking the traffic from some hosts.If I remove all the rules, then it works. I can not understand why?
...
user139430
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tc don't see marked packets
Server has 2 interfaces:
eth1 with address 13.0.0.254/24
eth0 with address 172.20.203.4/24.
It's routing traffic between this two networks. Task is to limit bandwidth between this two networks to ...
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nginx clobbering sftp traffic during peak times - is tc the answer?
This is probably a continuation of my previous (unanswered) question because the underlying cause is probably the same.
I have a Linux server with nginx and sshd running on it. It's on a shared ...
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Does TC rate policing mangle packets?
I'm trying to limit traffic to test performance of some in-house applications, but I am getting inconsistent results when configuring my home PC and my company testbed.
The goal is to police the rate ...
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Linux tc htb + prio = very slow link
I'm trying to shape the traffic going out of my DSL link (verified 1 mbit upload) using Linux (3.2) tc, HTB, and PRIO. My Linux box is connected via a Gigabit Ethernet link to the ADSL modem. I want ...
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Defining an explicit parent in traffic control rules
In traffic control, will an explicit parent declaration in a filtering rule override a flowid definition? E.g.;
tc qdisc add dev eth0 root handle 1: htb default 20
tc class add dev eth0 parent 1: ...
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Difference between HTB Rate and Ceil Values
What is the difference between the HTB rate and Ceil values?
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Using tc to delay packets to only a single IP address
I am new to using tc and netem. I want to delay packets being sent to a specific IP address. However, the commands below cause all packets on the system to be delayed, instead of just to the IP ...
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