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Questions tagged [tc]

Tc is used to configure Traffic Control in the Linux kernel.

148 questions
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Bucket size in tbf

I've read many times about Linux's token bucket filter (tbf) and still I don't fully understand how I should calculate the burst and latency parameters, shame on me :( I suppose that a reasonable latency is around 50 ms. OK, but what value should…
sebelk
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Understanding tc qdisc and iperf

I'm trying to limit bandwidth with tc and check the results with iperf. I started like this: # iperf -c 192.168.2.1 ------------------------------------------------------------ Client connecting to 192.168.2.1, TCP port 5001 TCP window size: 23.5…
Matías E. Fernández
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tc on bridge port

I have a 4 port bridge: root@Linux-Switch:~# brctl show bridge name bridge id STP enabled interfaces br0 8000.000024cd2cb0 no eth0 eth1 eth2 …
tMC
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How is the IFB device positioned in the packet flow of the Linux kernel

I would like to know the exact position of the following device in the packet flow for ingress traffic shaping: IFB: Intermediate Functional Block I would like to better understand how packets are flowing to this device and exactly when this…
rda
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set packet rate limit via iptables

I have a packet rate limit (max. 10 per seconds) which is set by my internet provider. This is a problem if I want to use the AceStream player, because if I exceed the limit I get disconnected. How can I restrict the internet access of this…
Andy
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Can't get tc to limit network traffic

Based on this section of the Linux Advanced Routing & Traffic Control HOWTO, I can't get tc to limit the network speed in my computer. The router is a Motorola SurfBoard modem with a few routing capabilities and firewall. The machine I want to limit…
admirabilis
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Adding qdisc under the mq top-level qdisc

This LWN article suggests that one may add/replace the network scheduler for a queue "under" the mq "dummy scheduler." These two point to that end: The mq scheduler does two things: - present device TX queues as classes, allowing to attach …
Andrew Falanga
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Tc qdisc delay not seen in tcpdump recording

I have two linux containers connected with a veth-pair. At veth-interface of one container I set up tc qdisc netem delay and send traffic from it to the other container. If I watch traffic on both sides using tcpdump/wireshark it can be seen that…
JenyaKh
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Limit bandwidth of individual HTTP requests while not throttling total bandwidth

Looking at tools like tc, wondershaper, htb and comcast, all these tools seem to operate on the level of a network interface or at least a "connection group" for limiting bandwidth. I'd like to not throttle bandwidth for a group of connections, but…
turtlemonvh
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How to configure QoS per IP basis?

We have say 4 users in a private network connected to the Internet trough a Linux router with a public IP address that is doing network address translation (NAT). I have to configure QoS to give access to the users to Internet but with throttled…
Neel
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tc show output explanation

I've found useful run watch along tc, for example: [root@router ~]# watch -dc tc -p -s -d qdisc show dev eth0 Every 2,0s: tc -p -s -d qdisc show dev eth0 Sat Oct 19 21:22:26 2013 qdisc prio 1:…
sebelk
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remove tc filter (Traffic Shaping)

How can I remove a single filter? tc filter show dev peth1 shows filter parent 1: protocol ip pref 16 u32 filter parent 1: protocol ip pref 16 u32 fh 800: ht divisor 1 filter parent 1: protocol ip pref 16 u32 fh 800::800 order 2048 key ht 800 bkt 0…
Vince
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Traffic shaping with tc does not work

I want to limit the outgoing traffic to a specific bandwidth. My Code: tc qdisc add dev vif1.0 root handle 1: htb default 30 tc class add dev vif1.0 parent 1: classid 1:1 htb rate 1mbit tc class add dev vif1.0 parent 1: classid 1:2 htb rate 1mbit tc…
Vince
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Why does tc-netem on loopback also affects other interfaces?

I'm trying to modify the network behaviour of my server(s), to simulate external/WAN connection behaviours (what ever that means). After doing tc qdisc add dev lo root netem delay 100ms, I can successfully add 100ms delay to all traffic from (and…
renyuneyun
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Unwanted defragmentation of forwarded ipv4 packets

I want to handle ip fragments in user-space, and I am using the iptables NF_QUEUE to direct packets to user-space. The problem is that IPv4 packets are always re-assembled and delivered as one packet rather than individual fragments. For IPv6,…
lgekman
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