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--- qos-settings [2024/04/10 21:34] – -grammar, formatting hogwild
+++ qos-settings [2024/04/16 16:55] (current) – [How Does all this Help Me?] remove "of the" hogwild
@@ Line 1: / Line 1: @@
-====== QoS Principles ======
+====== QoS - Basic Principles ======
-Quality of Service (QoS) is a method to prioritize/penalize predefined types of traffic. QoS is a fairly complex topic so we'll cover only enough basic principles to help configure an initial setup.   \\  Basically, QoS performs the following:\\
+Quality of Service (QoS) is a method to prioritize/penalize predefined types of traffic. QoS is a complex topic so this text will discuss only enough basic principles to help you configure an initial setup.
-  * Identifies traffic
+==== QoS is not Bandwidth Limiter ====
-  * Classifies this traffic
-  * Marks packets
-  * Defines classes and subclasses
-  * Set class parameters (such as reserved bandwidth)
- \\ You might have heard the above points when describing "diffserv" (differential services). Diffserv is the only QoS type FreshTomato can perform.
+QoS is not the same as FreshTomato's [[bwlimit|Bandwidth Limiter]]. \\
-It's often said that the QoS is a technique to mitigate lack of bandwidth when an upgrade is too costly or even impossible. More precisely, QoS also allows you to prioritize latency-sensitive traffic (such as voice) even when there's no network congestion. Thus, QoS introduces controls to allows you to protect certain traffic.\\   \\  {{:pasted:20230215-084814.png}}\\  \\
+  * QoS analyzes all traffic on all clients on the network.
+  * QoS follows rules for prioritizing one type of traffic over another.
+  * Bandwidth Limiter limits the bandwidth used by one or more client devices on the network.
+  * Bandwidth Limiter prioritizes one client device/group of client devices over others. \\ It does not analzye traffic types.
-Here is some commonly used QoS terminology:\\
+ \\
-  * **Traffic:** This is the stream of data between two nodes. This can be unidirectional (such as over UDP) \\ or bidirectional (such as over TCP) \\
+If you need a simple, crude tool for one or more known client devices, Bandwidth Limiter may be all that you need.
-  * **Best effort:** This is also referred to as "no QoS". This works on the principle of "first come first served", \\ the default queuing mechanism applied to network interfaces (AKA "FIFO"). When QoS is operating, best effort usually means that class of traffic that handles "everything else". It is therefore the lowest priority of all classes of traffic passed.\\
-  * **Classification:** This is the process of internally identifying packets based on predefined parameters. \\ For example, "from IP", "to port", "protocol=tcp". \\
-  * **Marking:** This is the action of actually colorize a packet (modify the Type of Service/DSCP field of the IP header) \\ with a locally significant meaning. This will help matching packet simply looking at the ToS/DSCP header. This process it not always performed.\\
-  * **Queuing:** This Outbound only process is the process of buffering data that the network can't process in real time. \\ There are many forms of Queuing in QoS. This is divided in classes. \\
-  * **Policing:** This is the [Inbound and Outbound] process of dropping packets in a controlled way. \\
-  * **Class Discipline**: This is the rule applied to all the classes of data in the priority class goes first no question asked, if priority is empty apply WFQ (weighted fair queuing)  amongst all the other classes, etc. There are dozen of queuing disciplines but only few are supported by FT. \\
-\\  Looking at the list above let's put everything together:\\  {{:pasted:20230215-085237.png}}\\
+QoS is a more sophisticated, more refined tool.
-==== What does this mean all mean to me? ====
+However, Bandwidth Limiter shares a few settings with QoS. When Bandwidth Limiter is enabled, QoS should be disabled, and vice versa. If both are enabled, they will conflict with each other and neither will work. \\
-Ever experienced a poor VoIP call from your LAN into Internet? Do you get media buffering too much? Is anyone in your LAN generating too much traffic? These are all things QoS can address for you. Please notice: QoS is NOT auto-regulating, you will need to define manually most of the parameters and tweak them as needed throughout time.
+Basically, QoS performs the following:\\
+  * Identifies traffic.
+  * Classifies this traffic.
+  * Marks packets.
+  * Defines classes and subclasses.
+  * Sets class parameters (such as reserved bandwidth).
+ \\ You might have heard the above points when describing "diffserv" (differential services). Diffserv is the only type of QoS that FreshTomato can perform.
+It's often said that QoS is a technique to mitigate lack of bandwidth when an upgrade is too costly or even impossible. More precisely, QoS also allows you to prioritize latency-sensitive traffic (such as voice) even when there's no network congestion. Thus, QoS introduces controls to allows you to protect certain traffic.\\   \\  {{:pasted:20230215-084814.png}}\\  \\
+Here are some commonly used QoS terms:\\
+  * **Traffic:** This is the stream of data between two nodes. Streams could be unidirectional (such as over UDP) \\ or bidirectional (such as over TCP).\\  \\
+  * **Best effort:** This is also known as "no QoS" or "first come, first served" (FIFO).\\ This is usually the default queuing mechanism applied to network interfaces.  \\ When QoS is operating, best effort usually means "that class of traffic that handles everything else".\\  \\
+  * **Classification:** This is the process of internally identifying packets based on predefined parameters. \\ For example: "from IP", "to port", "protocol=tcp". \\  \\
+  * **Marking:** This is the process of changing the Type of Service/DSCP field in the IP header of a packet \\ with a locally significant meaning. This will help (a router?) to match packets, as it can simply look at \\ their ToS/DSCP headers to know what type of data they contain. Marking it not always performed.\\  \\
+  * **Queuing:** This (Outbound only process) is the buffering of data which the network can't process in real time. \\ There are many forms of Queuing in QoS. This is divided into classes.\\  \\
+  * **Policing:** This is the (Inbound and Outbound) process of dropping packets in a controlled way. \\  \\
+  * **Queuing Discipline:** Also known as "Class Discipline". These are the actual rules of priority \\ that are applied to the data classes.\\ This specifies which packets are put into queues in which order, and in what quantity. \\ Packets in the Priority class always come first. If Priority is empty, WFQ (Weighted Fair Queuing) is applied among all the other classes. \\ There are many queuing disciplines. FreshTomato only supports the Qdisc Queing Discipline
+    * asdfgjkl
+    * asdfghjkl\\
+\\  The diagram below should help you to understand these principles:\\ \\ {{:pasted:20230215-085237.png}}\\  \\
+==== How Does all this Help Me? ====
+Have you ever experienced a poor quality VoIP call from your LAN onto the Internet? \\
+Do your media, such as videos, buffer too much?  \\
+Is someone on your LAN generating too much traffic?  \\
+These are all problems that QoS can help you to solve. Note that QoS is NOT auto-regulating. You need to manually define most QoS parameters, and tweak them, as needed.
 ===== CTF implications =====
@@ Line 37: / Line 65: @@
  \\
- \\
+ \\  This Network Scheduler Wikipedia entry may help you further understand the above principles: \\  [[https://en.wikipedia.org/wiki/Network_scheduler]]

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