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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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4answers
10k views

Does anyone really understand how HFSC scheduling in Linux/BSD works?

I read the original SIGCOMM '97 PostScript paper about HFSC, it is very technically, but I understand the basic concept. Instead of giving a linear service curve (as with pretty much every other ...
29
votes
1answer
2k views

Minimal rate and default class problem for HTB

I have some doubts about a HTB structure I'm using. My aim is to limit the download and upload speed of users in a local network. Each user of the network has a personal list of domains with a down ...
20
votes
3answers
29k views

Tc: ingress policing and ifb mirroring

I'm trying to setup traffic shaping on a Linux gateway as written here. The script needs to be customized because I have multiple LAN interfaces. So to shape the LAN side I am planning to create a ifb ...
18
votes
4answers
23k views

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 ...
14
votes
3answers
27k views

How can I do traffic shaping in Linux by IP?

We have a transparent proxy setup. I tried looking for traffic shaping in Linux, and all I could find online was to limit traffic by interface (eth0/eth1...). I need to limit the bandwidth (never ...
14
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3answers
40k views

Throttle bandwidth via iptables

I have a need to throttle the bandwidth usage, similar to how some ISPs do it, so that after a couple of seconds, it throttles down the speed.
12
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6answers
10k views

Rate-limiting incoming traffic

I've never quite understood whether or not it's possible to rate-limit incoming traffic. I realize that there is no direct method whereby to control the remote server's rate of sending packets (unless ...
12
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5answers
4k views

tc u32 — how to match L2 protocols in recent kernels?

I have a nice shaper, with hashed filtering, built at a linux bridge. In short, br0 connects external and internal physical interfaces, VLAN tagged packets are bridged "transparently" (I mean, no VLAN ...
12
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2answers
2k views

Linux TC class/filter numbering

I'm currently working on a traffic shaping solution for ISP-level companies, and came to an interesting (kindof philosophical) problem. Looking about the number of endpoints the system should handle (...
11
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6answers
2k views

What is the best solution for traffic control in a large system (ca. 2000 users)?

following situation: We're a group of students administering the internet connection for the local resident halls, with a total of about 2000 end users. We have a traffic point system, every MB down- ...
10
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3answers
427 views

bandwidth shaping, the best approach

Let's say I have a server with a lot of external IPs, 1024+. My users are causing heavy traffic but not all of them. The ones eating all the bandwidth are few and cause the other ones to suffer from ...
10
votes
1answer
2k views

Sharing Bandwidth and Prioritizing Realtime Traffic via HTB, Which Scenario Works Better?

I would like to add some kind of traffic management to our Internet line. After reading a lot of documentation, I think HFSC is too complicated for me (I don't understand all the curves stuff, I'm ...
9
votes
3answers
6k views

Simulating a slow connection with tc

I have a linux box (Centos 5.5) on which I want to limit the network traffic. I have an application that we distribute to clients and I want to test it on the minimum recommended bandwidth of 256Mbit/...
8
votes
5answers
1k views

Blocking BitTorrent

How can one block, or severely slow down, BitTorrent and similar peer-to-peer (P2P) services on one's small office network? In searching Server Fault I wasn't able to find a question that served as a ...
8
votes
4answers
1k views

Slow down individual connections passing through a Linux router?

We have a Linux server acting as a router/firewall for our office. Occasionally someone will upload a large file that takes up all our bandwidth. I don't want to implement any complex rules or traffic ...
8
votes
3answers
3k views

Limiting interface bandwidth with tc under Linux

I have a linux router which has a 10GBe interface on the outside and bonded Gigabit ethernet interfaces on the inside. We have currently budget for 2GBit/s. If we exceed that rate by more than 5% ...
7
votes
6answers
14k views

Generate a limited amount of random network traffic between 2 hosts

I'm trying to find a utility that will allow me to generate a constant flow of random network traffic at a specified rate between 2 hosts. The utility needs to run on Windows and OSX. I've tried iperf ...
7
votes
2answers
2k views

Why is my linux traffic shaping script having limited results?

I am trying to introduce some traffic rules to my Linux passthrough server that will give a better QoS for the following: 1) Low port traffic out of the box (web traffic and mail, etc). 2) Low port ...
6
votes
4answers
2k views

Packeteer Alternative [closed]

I have been tasked with starting to monitor and restrict our companies internet access. We have considered a Squid Proxy server but have decided we need something more robust then that. We would like ...
6
votes
2answers
3k views

Traffic shaping: tc filter catch all filter

How Can I configure a "catch all" filter with tc filter? I tested with the following code but it gave me the error: "Unknown filter "1:100", hence option "protocol" is unparsable": tc filter add ...
6
votes
3answers
9k views

Linux traffic shaping using TC

My internet connection goes like this: Internet <-128kbps link-> Cisco Router (Public IP) <-LAN-> Linux router/server (Public IP) <-LAN-> Regular PCs (Public IPs) The Cisco router: the ...
5
votes
1answer
13k views

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), ...
5
votes
1answer
14k views

deleting filters in tc

I have added a filter in tc as follows: tc filter add dev eth0 parent 1: protocol ip handle 6 fw flowid 1:6 This should be sending packets marked by iptables with '--set-mark 6' to class 1:6. The ...
5
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4answers
3k 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 ...
5
votes
1answer
544 views

What outbound HTTP throttling solutions exist?

I am looking for a way to flexibly manage outbound HTTP/HTTPS traffic in a way that respect site policies, and could be deployed at the "edge" of our datacenter network. For example, we use several ...
5
votes
2answers
114 views

How is excess bandwidth distributed in linux htb?

Say I have 100kbps bandwidth - Root - 100kbps / \ / \ / \ / \ / ...
5
votes
1answer
720 views

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 ...
5
votes
1answer
5k views

Difference between HTB Rate and Ceil Values

What is the difference between the HTB rate and Ceil values?
5
votes
2answers
1k views

Improving Skype quality

Every now and then I revisit the issue of shaping skype traffic. AFAIK Skype is notorious for ignoring most settings - incoming ports, proxies, etc so it is not possible to give special treatment to ...
5
votes
1answer
1k views

pfsense 2.0 traffic priority - set full priority for single host

I have a network with several computers all on the same network and since I have very limited bandwidth I would like to prioritize traffic almost like a CPU scheduler prioritize processes. Example: ...
4
votes
3answers
4k views

Are there simpler ways to do traffic shaping in linux besides tc?

I read lartc but I don't feel I need such a complicated solution for simple needs. One of such simple use cases is to limit a specific process' available bandwidth, upstream or downstream. How can I ...
4
votes
3answers
9k views

Incoming (ingress) traffic shaping on Linux - bw is lower than expected

I want to limit incoming (download) speed for Linux box. Both, the box, which is configured, and trafic source (HTTP server) are connected to the same switch, if shaping is not configured, download ...
4
votes
1answer
4k views

Limiting bandwidth on Ubuntu Linux

I am in the situation where I have to simulate a P2P-environment (for my masters thesis in computer science). To do that I am using Docker with Ubuntu to create a bunch of virtual machines that is ...
4
votes
1answer
182 views

Inject Delay between Virtual Machines in a VLAN

We'd like to simulate the impact of locality using VMs within a on a public cloud (say AWS EC2). To do this, we would like to inject delays in packets such that we can simulate a particular network ...
4
votes
2answers
6k views

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 ...
4
votes
3answers
5k views

Limiting internet traffic per user/IP based on volume

I have a shared internet connection on my network which I currently manage using Smoothwall Express. I want to be able to allocate each of my housemates a certain amount of bandwidth per month. My ...
4
votes
2answers
8k views

maximum number of connections Squid

I have a Squid proxy server that controls all internet traffic for my network. I need a way to stop users from downloading big files (say >50MB) in my network. I banned some famous ports (e.g. ...
4
votes
1answer
415 views

What are the characteristics of the Meraki SpeedBurst traffic shaping algorithm?

I've been using Cisco Meraki wireless access points to provide guest and BYOD access at some of my customer sites. One of the interesting bandwidth management features is the SpeedBurst traffic ...
4
votes
1answer
990 views

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 ...
4
votes
1answer
858 views

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 ...
4
votes
1answer
4k views

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 ...
4
votes
0answers
566 views

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 ...
4
votes
0answers
2k views

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 ...
4
votes
0answers
845 views

MasterShaper alternative [closed]

I'm looking for an alternative to MasterShaper, something possibly web-based which could allow me to manage QoS easily. Actually MasterShaper still looks supported, but would like to understand if ...
4
votes
2answers
574 views

Linux TC / Policy Routing tools

In addition to a really good firewall Linux has a builtin advanced routing and traffic shaping (lartc). There are many applications (firehol, firestarter, etc) to make the creation of iptables ...
3
votes
1answer
14k views

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 ...
3
votes
2answers
7k views

Traffic shaping HTTP downloads with l7-filter

Given the following: A small, remote office has only a few users and a 1.5 Mbps DSL connection via a ZyXEL 660R. Users experience unacceptable latency and packet loss when even one large file is ...
3
votes
1answer
6k views

How to add latency and bandwidth-limit interface using tc?

I know I can add latency to an interface using this command: # tc qdisc add dev eth0 root netem delay 50ms In addition to latency, I want to limit the bandwidth of this interface to 100kbps. How ...
3
votes
1answer
670 views

Ubuntu 14.04 - tc not working

I have used tc before on another servers to restrict the total bandwidth available on port 80, in order to make sure that there is enough throughput for port 22 during peak hours of the day. I need ...
3
votes
2answers
2k views

Limiting bandwidth with hashlimit (e.g. kb/s — not connections!) doesn't work, though the man page says it should

According to the iptables-extensions man page hashlimit can do bandwidth limiting: "flows exceeding 512kbyte/s" => --hashlimit-mode srcip,dstip,srcport,dstport --hashlimit-above 512kb/s ...