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Htb quantum calculator5/24/2023 Tc qdisc add dev eth0 parent 1:10 handle 20: pfifo limit 5 If none is specified the default is pfifo. Now we can optionally attach queuing disciplines to the leaf classes. Not from source address 1.2.3.4) will be put in class 1:12. It might be more clear to do so, but this illustrates the use of the default.Īny packet not classified by the two rules above (any packet You may notice that we didn't create a filter for the 1:12 class. Note: The U32 classifier has an undocumented design bug which causesĭuplicate entries to be listed by "tc filter show" when you use U32 (We identify A by its IP address which we imagine here to be 1.2.3.4.) Match ip src 1.2.3.4 match ip dport 80 0xffff flowid 1:10 Tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32 \ The commands will look something like this: See the tc filterĭocumentation for details. This is really not related to the HTB qdisc. We also have to describe which packets belong in which class. Is that handles are local to an interface, e.g., eth0 and eth1 could each When they have already used handle or parent. Note: Sometimes people ask me why they have to repeat dev eth0 These are defined by the next three lines. In this case we do want to allow borrowing, so we have to create an extraĬlass to serve as the root and put the classes that will carry the real data We could have created the other three classes directly under the htb qdisc,īut then the excess bandwidth from one would not be available to the others. To borrow from each other, but one root class cannot borrow from another. The definition of a root class is one with the htb qdisc as its parent.Ī root class, like other classes under an htb qdisc allows its children The first line creates a "root" class, 1:1 under the qdisc 1. Tc class add dev eth0 parent 1:1 classid 1:12 htb rate 60kbps ceil 100kbps Tc class add dev eth0 parent 1:1 classid 1:11 htb rate 10kbps ceil 100kbps Tc class add dev eth0 parent 1:1 classid 1:10 htb rate 30kbps ceil 100kbps Tc class add dev eth0 parent 1: classid 1:1 htb rate 100kbps ceil 100kbps Must have a non-zero value for its y value. The handleįor a qdisc must have zero for its y value and the handle for a class Y is an integer identifying a class belonging to that qdisc. Handles are written x:y where x is an integer identifying a qdisc and In general (not just for HTB but for all qdiscs and classes in tc), Means that any traffic that is not otherwise classified will be assigned This is just a name or identifier with which to refer to it below. This command attaches queue discipline HTB to eth0 and gives it the Tc qdisc add dev eth0 root handle 1: htb default 12 The simplest approach is shown in the picture at the right. The different kinds of traffic above are represented by classes in That this seems like a bad term since there is no obligation to repay the We use that term below to conform with the literature. Note: In the literature this is called "borrowing" the excess bandwidth. Remaining (excess) bandwidth is distributed to other classes which requestĪlso see document about HTB internals - it When a class requests less than the amount assigned, the HTB ensures that the amount of service provided to each class isĪt least the minimum of the amount it requests and the amount assigned Which needs it (in proportion of its allocated share). Any unused bandwidth can be used by any class Next we want to subdivide A's bandwidth 30kbps for WWW and 10kbpsįor everything else. We want to allocate 60 kbps to B and 40 kbps to A. Link sharing Problem: We have two customers, A and B, both connected to the Kilobits ! This is the most FAQ about tc in linux.Ģ. Please read: tc tool (not only HTB) uses shortcuts to denote units This release of HTB should be also much more scalable. Most sections have examples, charts (with measured data) and To decide which simulated link to use for a given packet to be sent. To specify how to divide the physical link into simulated links and how Kinds of traffic on different simulated links. ![]() One physical link to simulate several slower links and to send different ![]() Use of the outbound bandwidth on a given link. HTB is meant as a more understandable, intuitive and faster replacement for theĬBQ qdisc in Linux. Making, debugging and sending error reports 1. Coloring is removed on new textĪfter 3 months. Martin Devera aka devik devik and Don Cohen HTB manual - user guide HTB Linux queuing discipline manual - user guide
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