Questions tagged [traffic-shaping]

Traffic shaping is a technique to delay some or all datagrams to comply with desired traffic profile.

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Traffic shaping and artificial latency per IP in a LAN network using tc/netem

for the last few days I have been trying to setup traffic shaping and artificial latency in a local network. Currently I have an Ubuntu 20.04 PC with 2 NICs, where one is connected to the company ...
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Traffic shaping with tc penalise large downloads

I have this shaping script that is supposed to penalise downloads larger than 10mb by downgrading their connection speed. If I test with one connection the penalty is in effect and the download speed ...
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Limit bandwidth by tc per src IP

I would like to limit output bandwith to server in LAN (virtual server in fact) per IP session / or src IP in other words. My following rules on router doesn't work: tc qdisc add dev lxdbr0 root ...
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How can I limit download/upload speed for every single user on OpenVPN using TC?

I have an OpenVPN server on CentOS 7 and I want to limit the download/upload speed for every single OpenVPN client to 512 kilo byte per second . From my own researches , I understood that I can ...
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shape voice linux traffic using tc

How to set up a traffic control policy so voice traffic has maximum bandwidth of an specific interface? I tried tc qdisc add dev $WIFI handle 1: root tbf rate 10mbit burst 32kbit latency 10ms but how ...
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Why am I seeing overlimits in TC statistics?

I configured my linux servers with tc (TBF) using the below parameters: rate 1Gbit burst 1000Kb lat 200.0ms Now, when I'm testing Iperf between this server and another server as iperf client, I'm ...
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Dynamic bandwidth in Tc (Bandwidth Changes over time)

Basically I wanted to change the bandwidth after every 10 seconds using tc. So how to do that thing in tc. This is my script. !/bin/bash # # tc uses the following units when passed as a parameter. # ...
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traffic control (tc) filter not working

i am using Debian and am trying to limit the upload-bandwidth on an ip basis. The configuration is the following: #!/bin/bash tc=/sbin/tc $tc qdisc del dev eth0 root 2> /dev/null > /dev/null $...
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Limit traffic to any one device with nftables meters

I have a Linux server (up-to-date debian buster) acting as a firewall/router to share an Internet connection among several Windows 10 and Ubuntu Linux workstations (5-10, no more than that). Since the ...
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Does tc guarantee network bandwidth for a process or run as best effort?

I have a tc rule as follows: qdisc tbf 1: dev bwp93ce2ea9d929 root refcnt 2 rate 100Mbit burst 100Kb lat 25.0ms Is this rule guarantee network bandwidth to be 100Mbps or it'll throttle if not enough ...
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Reduce the network traffic priority in Linux

I want to reduce the priority of specific network traffic using tc in particular tc-u32 in my Linux server. In other words all other traffic must have higher priority than traffic with specified IP-...
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Linux traffic control u32 hashtable filters based on MAC address

I am currently working with a traffic shaping Linux node. The rule set has grown to about 2500 hosts, all identified specifically by MAC address. The filter configuration is "basic", meaning ...
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Bash: Dynamically traffic shaping rsync using variables for times schedule and slowing during runtime?

What are some solutions to having dynamic traffic shaping run during a bash script, after a command has already started? Is this even possible? My use case is, I have rsync running on a huge set of ...
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Corruption using linux traffic control (tc command)

I am kinda new to doing traffic control using Linux tc commands. So i am doing some hands-on on introducing network delay, packet loss and corruption etc across two hosts in the same network. The ...
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How is traffic shaping handled for WAN links with unknown bandwidth?

We have a customer on a site with an LTE cell link as their WAN connection. The cell provider sells the link as 25Mbps down by 10Mbps up. The customer needs traffic shaping on site, where some of ...
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Linux HTB: More than 70% of ceil rate is never achieved

Background:- I have an arm based system, which has HTB setup on the eth and wlan interface. Here is the HTB configuration:- tc class add dev eth1 parent 1:1 classid 1:1 htb rate 1Gbit ceil 1Gbit ...
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Linux traffic control did not reach expectation when using HTB and filter

I am doing an tc experiment between two servers. When no tc rules are added, the bandwith between the two servers is about 7Gbps tested with iperf3. Then I add a tc filter based on HTB for testing. ...
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how to proritize UDP port in tc

I have this TC code sudo tc qdisc add dev eth0 root handle 1: prio sudo tc filter add dev eth0 protocol ip parent 1: prio 1 u32 match ip dport xxxx 0xffff flowid 1:1 where XXXX is the port number. ...
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Unable to set bandwidth limit on ingress wireless interface with netem and ifb

I am trying to limit the bandwidth on the ingress of a wireless interface using an IFB virtual interface. I followed the instructions here Summary of the steps: Bringing up ifb: sudo modprobe ifb ...
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Juniper MX traffic shaping - bypass rate limits for just a few destinations

The aforementioned MX router is a BRAS providing access for about 3,000 subscribers, using the 'dynamic-clients' functionality. Each subscriber demux interface gets assigned a specific firewall rate-...
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Traffic Control - is it possible to distinguish between www browsing and www bulk (iso download) traffic?

Lately i was working on uploading big files to website, this upload eat whole bandwidth and crippled my network. So i implemented chunking one 1MB chunk per second and its working but now I'm thinking ...
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How to remove the ingress delay introduced using tc

I learned that we can introduce delay to ingress packets using tc by following the commands specified in : https://wiki.linuxfoundation.org/networking/netem#...
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throttle outgoing linux network traffic under high latency

I want to slow my outgoing traffic when it encounters congestion, and measure "congestion" by packet response times. The intent is to avoid one NFS client starving all the other clients when ...
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Using tc qdisc, class, and filter to limit bandwidth (both ingress and egress) based on DSCP marks

I'm looking to set-up traffic shaping program that limits both incoming and outgoing traffic based on 6-bit DSCP field in IPv4 packet header. The user should be able to specify different rates for ...
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Deleting root pfifo_fast (tc) on Linux

I'm trying to delete all qdiscs to do "fresh" configuration: % tc qdisc del dev enp0s25 root RTNETLINK answers: No such file or directory But it's there: % tc qdisc show qdisc noqueue 0: dev lo ...
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Traffic control upload don't limit bandwidth

I'm making some rule to limit the bandwidth per ip connection on my VPN server. My command works for download but doesn't for upload, I don't know what I'm doing wrong here : #!/bin/bash TC='/usr/...
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OpenVPN Traffic Control on CentOS 7

I'm trying to give my OpenVPN some bandwidth limitation. I would like for example for each user give 10Mb/s for upload and download. I tried the following answer I found (Automatically Call a Script ...
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Adding some delay to a specific port on localhost using tc and netem

I'm going to simulate a network latency on three different ports of local host by using tc (traffic control for Linux) commands. I run the following code: !/bin/bash tc qdisc add dev lo root handle 1:...
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Basic QoS bandwidth for all devices/clients

I have an IP network that has about 500+ clients on the network at any given time. The network uses a Cisco 1941 router as it's gateway, and has 5 different subnets. The network also has 2 DCs, a ...
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Advanced tc filtering flow map for SFQ queue

I'm trying to change the default filtering for a SFQ to one based on source IP, where each IP goes to a class. I know I can create a SFQ with more divisors with something like: tc qdisc add ... sfq ...
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Linux HTB number of levels

Re-modified Linux HTB by adding a single printk message in htb_dequeue function. static struct sk_buff *htb_dequeue(struct Qdisc *sch) { ... original code ... original code for (level = 0;...
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How is excess bandwidth distributed in linux htb?

Say I have 100kbps bandwidth - Root - 100kbps / \ / \ / \ / \ / ...
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Limit traffic on by user OpenVPN server using tc (traffic control)

I run an OpenVPN server with a 1 Gbps bandwidth and I need to limit it to 5 Mbps per user. Searching the internet I've come up to this bash script: $U32 = "tc filter add dev tun0 protocol ip parent ...
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Limit packet rate, open connections, and IP addresses

On Linux, can I use tools like tc, iptables or others to control/shape network traffic on a network interface, for the following purposes: Control the network packet number rate (or the total number)....
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htb multiply root rate by 8

I am changing the queue discipline to HTB, creating a parent node, and 3 children which are the classes. sudo tc qdisc add dev em1 root handle 1: htb sudo tc qdisc add dev em1 parent 1: classid 1:1 ...
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Captive portal with local webserver and limited internet access

I have a mini pc running Linux. It has a 3G modem, wifi modem, runs nodogsplash for the captive portal, hostapd, dnsmasq, web server that gives out data that the user needs. I have the 3G device for ...
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tc qdisc with GRE in openwrt

I'm trying to implement traffic control to GRE interface in an openwrt board. For this i followed below steps, Create GRE interface named gre1 in both tunnel end devices. Tested reachability with ...
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HTB Traffic shaping in Linux - change quantum of a class

I am using Linux HTB to shape traffic, I am able to achieve the bellow diagram. The problem arise when I want to change the allocation for the excess bandwidth, instead of giving each class its ...
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1 answer
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Testing Linux HTB fall short of expectation

I am trying to test Linux HTB, doing the simplest example just to see it actually works. I am creating a root and giving it 200kbps, then I create 3 classes which each one gets assigned a portion of ...
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force tbf qdisc to drop traffic

I have several virtual netspaces on my server connected via the virtual adapters. One of the connections between the netspaces is limited to 10 Mbps: root@core-wkst:/var/log# tc -s qdisc show dev ...
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Split ping RoundTripTime

Data obtained from ping: is it round trip or one way? shows that the data of a ping measures both directions together. Is there any way to split this information in time-to-destination and time-back?
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Bandwidth shaping for an ipset using qdisc and tc

I am trying to do bandwidth control for an ipset using these tutorials 1,3,21. And this script. I have modified it to get ipsetnames. This is my bandwithshaing script. TC=/sbin/tc IF=wlan0 ...
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How to set an general network limit per client + priority for TCP acknowledgements

Following situation: Network A is connected to network B over an slow connection. Different hosts in network A would like to send traffic to hosts in network B. Hosts in network B sending commands to ...
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4 votes
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Limiting incoming traffic with tc police

I have a requirement to limit the total incoming traffic to 5mbit. I know this can be achieved by using the following tc command: tc filter add dev eth0 parent ffff: protocol ip u32 match u32 0 0 ...
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Linux traffic shaping for large bandwidth (more than 1Gig)

I am doing an experiment between three computers that are connected with 10Gig interfaces and have RTT of 100 microseconds. Let's say these are machines A, B, and C. Machine A is communicating with B ...
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Limit download speed to single LAN IP using TC on router's WAN interface

Currently I police the rate on my download speed with tc filter add dev ppp0 parent ffff: protocol ip prio 50 u32 match ip src 0.0.0.0/0 police rate 9900kbit burst 10k drop flowid :1 I've got one ...
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Traffic shaping with iptables, ipset and tc (--match-set and --set-mark)

I am having some trouble with what I believe should be a fairly straightforward traffic shaping problem. I have an Ubuntu (16.04) server that is acting as a router/nat. I want to allow most users to ...
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tc police rate packets by iptables handle?

I want to limit download speed from any IP to 800kbit, (this works) And I want to limit the download speed of marked packets to 400kbit. I don't get any errors, but it's not limiting the download ...
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shape dropbox on linux router with tc and iptables

Another machine on my LAN is uploading to Dropbox and saturating my internet connection's upload bandwidth. When that happens my pings to 8.8.8.8 take 3000-6000ms. When dropbox is not uploading my ...
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How to configure per IP bandwidth control using TC?

Requirements: There is an arbitrary number of users per group. Bandwidth for any particular group is 1000kbps. Bandwidth for each user in a group is 70 kbps. At any time no user should not consume ...
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