TC is the linux tool used to manipulate the traffic control functionality in the kernel.

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12
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2answers
943 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 ...
10
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4answers
2k 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 ...
7
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3answers
8k 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 ...
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2answers
1k views

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 > ...
5
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2answers
656 views

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 ...
4
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3answers
2k views

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 ...
4
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1answer
3k 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 ...
4
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1answer
603 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 ...
3
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2answers
375 views

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 ...
3
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2answers
2k views

TC hashing filters - single rule deletion

For traffic shaping I'm currently using a setup that looks exactly like the setup from LARTC, on this page: http://lartc.org/howto/lartc.adv-filter.hashing.html I have a simple problem with that - ...
3
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5answers
678 views

QoS configuration for a medium ISP

What is the best Linux-based QoS platform to implement a configuration where all 256Kbps DSL clients (all belong to the same IP range) get a guaranteed speed of 200Kbps with single QoS rule?
3
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1answer
134 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 ...
3
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1answer
217 views

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. $ ...
3
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2answers
204 views

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: ...
3
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2answers
2k 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 ...
3
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1answer
131 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 ...
2
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3answers
2k views

Making iptables recognize youtube streams and large files

I use Ubuntu server 10.04 with the stock kernel as a NAT router. I use iptables and tc to do port based traffic prioritization. It is working fine. I have given http higher priority. So my network ...
2
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3answers
2k views

QOS on ubuntu server

I want to run the following script on ubuntu server. eth1 is NAT interface, and eth2 is the WAN interface which has a static public ip: TCA="tc class add dev eth2" TFA="tc filter add dev eth2" ...
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3answers
3k views

How to match port range using u32 filter

with "u32 match ip sport 80" in Linux tc I can match port 80, but how can I match a port range 10000 - 20000 ?
2
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3answers
3k views

Shaping outbound Traffic to Control Download Speeds with Linux

I have a situation where a server makes lots of requests from big webservers all at the same time. Currently, I have not control over the amount of requests or the rate of the requests from the ...
2
votes
1answer
242 views

Matching last fragment of IP packets using tc or ipfilter

I am transmitting UDP packets of say 2900 bytes. Due to fragmentation, packet is divided in 2 IP fragments. My tc u32 filter (more fragments bit and IP/PORT combination) matches only first fragment ...
2
votes
1answer
838 views

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 ...
2
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1answer
929 views

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 ...
2
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1answer
2k 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 ...
2
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2answers
755 views

tc prio qdisc for priorization of mysql traffic

I am struggling with tc prio qdisc for a few hours now. I have read the lartc Documentation, Examples and HowTos, but this whole thing is kinda new for me and somewhat confusing :) So this is my ...
2
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1answer
87 views

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 ...
2
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1answer
389 views

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. ...
2
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0answers
1k 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 ...
2
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1answer
685 views

Traffic shaping: tc filter attached to an HTB class?

Can I attach a tc filter to an HTB class rather than to an HTB qdisc? For example: tc class add dev $IF_LAN parent 1:100 classid 1:180 htb rate 19kbit ceil 2000kbit prio 4 where: 1:100 -> Is ...
2
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1answer
1k views

HTB.init / tc behind NAT

I have an Ubuntu 10 box that I'm trying to set up as a bandwidth-shaping router. The machine has one WAN interface, eth0 and two LAN interfaces, eth1 and eth2. NAT is configured using MASQUERADE as ...
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2answers
1k views

controlling the bandwidth using tc

I have two NICs. eth0 is connected to the internet and eth1 is connected to the LAN. I want to restrict the download limit using iptables and linux tc. So I wrote a test script to verify if it is ...
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1answer
4k 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), ...
1
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1answer
2k views

Limit bandwidth using tc, iptables, and htb

I'm running a Debian server and was wondering if there are good resources out there, to which you can point me, where I can read about traffic limitations. I have couple users sharing one server. ...
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3answers
3k views

Traffic shaping on Linux with HTB: weird results

I'm trying to have some simple bandwidth throttling set up on a Linux server and I'm running into what seems to be very weird stuff despite a seemingly trivial config. I want to shape traffic coming ...
1
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2answers
1k views

tc simple rate limiting

I would like to do a simple rate limiting so all the http traffic (in & out) going to or from my http server is shaped. I have a GigE connexion on the server and I want to rate limit all HTTP ...
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1answer
2k 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 ...
1
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1answer
318 views

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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1answer
2k views

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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2answers
1k views

Bash Script - Traffic Shaping

hey all, I was wondering if you could have a look at my script and help me add a few things to it, How do I get it to find how many active ethernet ports I have? and how do I filter more than 1 ...
1
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1answer
3k views

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 ...
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2answers
1k views

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 ...
1
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1answer
2k views

Linux income filtering based on private destination IP address

I am trying to set up a QoS script in my OpenWRT box so that traffic coming from the Internet is classified into a low prio and a high prio class. The criteria to classify traffic is its destination ...
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1answer
1k views

tc traffic limiting/shaping/throttling/policing in linux ipv6 issues

I managed to discover an interesting issue: I'm not getting proper limiting with ipv4 traffic, but instead it works perfectly with ipv6. This doesn't make much sense to me since I read this article: ...
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1answer
631 views

How to monitor qdisc bandwidth utilization

I have created a script to shape my traffic using tc. Is there any tool in Linux which will help me to visualize and monitor qdisc bandwidth utilization ?
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1answer
587 views

traffic shaping for certain (local) users

i'm using ubuntu 10.10 i've a local backup user called "backup". :) i would like to give this user just a bandwidth of 1Mbit. No matter which software wants to connect to the network. this solution ...
1
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1answer
256 views

Traffic control: marking packets for shaping

I'm seeking advice about which technology to use to classify packets for shaping in traffic control (tc). I've found at least 3 that could be used: iptables MARK iptables CLASSIFY tc filter Which ...
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3answers
229 views

Priorize linux traffic in same protocol (http download vs htto browsing) with htb/tc

I have a big time reading but i cant figure-out how to do this. always i have a download in mu network all http browsing are affected, i need to do some specific or dont use sfq ? some one have a ...
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2answers
607 views

How much traffic a linux-based shaper would be able to chew

I have a linux based traffic shaper (iptables + tc htb policy). It works in bridge mode. Shapes traffic based on IPs and ports (there are about 100 rules in the "mangle" chain of iptables). Right now ...
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0answers
23 views

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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0answers
115 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 ...