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| ==Summary==
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| The <b>QoS</b> (<b>Quality of Service</b>) page is used to set up Smart Queue Management (SQM) instances which can limit the download and upload speeds of selected network interfaces.
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| {{Template:Networking_all_manual_basic_advanced_webui_disclaimer}}
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| This manual page provides an overview of the QoS windows in {{{name}}} routers.
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| {{Template:Networking_all_manual_fw_disclosure
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| | fw_version = {{{series}}}_R_00.02.04
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| }}
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| ==Smart Queue Management==
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| The <b>Smart Queue Management</b> section contains a list of existing SQM instances and can be used manage them (edit/delete/enable/disable). By default the list is empty:
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| [[File:Networking_all_manual_qos_smart_queue_management.png|border|class=tlt-border]]
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| ----
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| To add a new instance and begin editing, look below to the <b>Add New SQM Configuration</b> section and:
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| <ol>
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| <li>enter a custom name in the 'Name' field;</li>
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| <li>click the 'Add' button;</li>
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| <li>click the 'Edit' button next to newly created instance.</li>
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| </ol>
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| [[File:Networking_all_manual_qos_and_new_sqm_example.png]]
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| Refer to the sections below for information on editing SQM instances.
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| ===Basic Settings===
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| ----
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| The <b>Basic Settings</b> section is used to set download and upload speed limits for a selected network interface.
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| [[File:Networking_all_manual_qos_smart_queue_management_basic_settings.png|border|class=tlt-border]]
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| <table class="nd-mantable">
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| <tr>
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| <th>Field</th>
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| <th>Value</th>
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| <th>Description</th>
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| </tr>
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| <tr>
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| <td>Enabled</td>
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| <td>off | on; default: <b>off</b></td>
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| <td>Turns the SQM configuration on or off.</td>
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| </tr>
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| <tr>
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| <td>Interface name</td>
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| <td>network interface; default: <b>br-lan (lan)</b></td>
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| <td>Selects to which interface this SQM configuration will apply. <b>Additional note:</b> consider reading the [[{{{name}}}__QoS#Additional_notes|Additional notes]] section before limiting speeds on selected interfaces.</td>
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| </tr>
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| <tr>
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| <td>Download speed (kbit/s)</td>
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| <td>integer [0..9999999999999999]; default: <b>none</b></td>
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| <td>Limits the download speed (ingress) of the selected interface to the value specified in this field.</td>
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| </tr>
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| <tr>
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| <td>Upload speed (kbit/s)</td>
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| <td>integer [0..9999999999999999]; default: <b>none</b></td>
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| <td>Limits the upload speed (ingress) of the selected interface to the value specified in this field.</td>
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| </tr>
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| </table>
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| ===Advanced Settings===
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| ----
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| The <b>Advanced Settings</b> section describes the internal logic of the SQM configuration.
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| [[File:Networking_all_manual_qos_smart_queue_management_advanced_settings.png|border|class=tlt-border]]
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| <table class="nd-mantable">
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| <tr>
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| <th>Field</th>
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| <th>Value</th>
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| <th>Description</th>
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| </tr>
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| <tr>
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| <td>Queuing disciplines usable on this system</td>
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| <td>cake | fq_codel; default: <b>cake</b></td>
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| <td>Queue management logic type. Look to the row below for detailed information.</td>
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| </tr>
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| <tr>
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| <td>Queue setup script</td>
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| <td>layer_cake.qos | piece_of_cake.qos | simple.qos | simplest.qos | simplest_tbf.qos; default: <b>piece_of_cake.qos</b></td>
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| <td>Describes the queue management logic.
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| <ul>
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| <li><b>cake</b>
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| <ul>
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| <li><b>layer_cake.qos</b> - uses the cake qdisc as a replacement for both htb as shaper and fq_codel as leaf qdisc. This exercises cake's diffserv profile(s) as different "layers" of priority.</li>
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| <li><b>piece_of_cake.qos</b> - uses the cake qdisc as a replacement for both htb as shaper and fq_codel as leaf qdisc. It just does not come any simpler than this, in other words it truly is a "piece of cake".</li>
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| </ul>
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| </li>
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| <li><b>fq_codel</b>
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| <ul>
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| <li><b>simple.qos</b> - BW-limited three-tier prioritisation scheme with your qdisc on each queue.</li>
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| <li><b>simplest.qos</b> - simplest possible configuration: HTB rate limiter with your qdisc attached.</li>
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| <li><b>simplest_tbf.qos</b> - simplest possible configuration (TBF): TBF rate limiter with your qdisc attached. TBF may give better performance than HTB on some architectures.</li>
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| </ul>
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| </li>
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| </ul>
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| </td>
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| </tr>
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| </table>
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| ===Additional notes===
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| ----
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| Please consider that limiting the speed of certain interfaces may limit the speed of other interfaces as well. For example, if you limit the download and upload speeds of the default LAN interface (<i>br-lan</i>) to 50 000 kbps (50 Mbps) this will affect the speeds between:
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| <ul>
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| <li>Ethernet LAN machines (including the router)</li>
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| <li>Ethernet LAN machines and WAN<span class="asterisk">*</span></li>
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| {{#ifeq:{{{wifi}}}|1|<li>WiFi devices<span class="asterisk">**</span></li>
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| <li>Wifi devices and LAN machines<span class="asterisk">**</span></li>
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| <li>WiFi devices and WAN<span class="asterisk">**</span></li>
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| |}}</ul>
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| <span class="asterisk">*</span> Since LAN machines communicate with WAN servers over the router which is also considered a LAN machine, LAN-to-WAN and WAN-to-LAN speeds are also affected.
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| {{#ifeq:{{{wifi}}}|1|<span class="asterisk">**</span> By default, wireless network interfaces are attached to the default Ethernet LAN network (<i>br-lan</i>). If you wish for WiFi speeds to remain unaffected, consider creating an additional Ethernet interface and attach your WiFi interfaces to it. This can done in the following WebUI pages:
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| <ul>
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| <li>Network → [[{{{name}}} Interfaces|Interfaces]] (to create an additional network interface)</li>
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| <li>Network → [[{{{name}}} Wireless|Wireless|]] (to attach WiFi interfaces to Ethernet interfaces)</li>
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| </ul>
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| |}}
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| The table below demonstrates speed changes between some of the main default network interfaces if <b><i>br-lan</i> speed is set to 50 Mbps</b>.
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| <table class="nd-othertables_3" style="text-align: center;">
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| <tr>
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| <th width=150 style="text-align: center;"></th>
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| <th width=200 style="text-align: center;">Ethernet LAN</th>
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| {{#ifeq:{{{wifi}}}|1|<th width=200 style="text-align: center;">WiFi LAN</th>|}}
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| <th width=200 style="text-align: center;">Ethernet WAN</th>
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| <th width=200 style="text-align: center;">Mobile WAN</th>
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| </tr>
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| <tr>
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| <td style="text-align: left; font-weight: bold">Ethernet LAN</td>
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| <td>50</td>
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| {{#ifeq:{{{wifi}}}|1|<td>50</td>|}}
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| <td>50</td>
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| <td>50</td>
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| </tr>
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| {{#ifeq:{{{wifi}}}|1|<tr>
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| <td style="text-align: left; font-weight: bold">WiFi LAN</td>
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| <td>50</td>
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| <td>50</td>
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| <td>50</td>
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| <td>50</td>
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| |}} </tr>
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| <tr>
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| <td style="text-align: left; font-weight: bold">Ethernet WAN</td>
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| <td>50</td>
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| {{#ifeq:{{{wifi}}}|1|<td>50</td>|}}
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| <td>unchanged</td>
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| <td>unchanged</td>
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| </tr>
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| <tr>
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| <td style="text-align: left; font-weight: bold">Mobile WAN</td>
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| <td>50</td>
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| {{#ifeq:{{{wifi}}}|1|<td>50</td>|}}
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| <td>unchanged</td>
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| <td>unchanged</td>
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| </tr>
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| </table>
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| Changing the speeds of other network interfaces may also affect more than one interface. However, the Ethernet LAN interface (<i>br-lan</i>) is related to most interfaces. Therefore, it is advised to limit the speeds of other interfaces in order to achieve more precise results (unless, of course, your goal to is to limit the speed of <i>br-lan</i>).
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| ----
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| Another example to consider is limiting WAN interface speeds since that is the most widely implemented use case and affects less interface-to-interface relationships. For instance, limiting <b>Ethernet WAN (<i>eth1</i>) speed to 50 Mbps</b>would produce the following results:
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| <table class="nd-othertables_3" style="text-align: center;">
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| <tr>
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| <th width=150></th>
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| <th width=200 style="text-align: center;">Ethernet LAN</th>
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| {{#ifeq:{{{wifi}}}|1|<th width=200 style="text-align: center;">WiFi LAN</th>|}}
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| <th width=200 style="text-align: center;">Ethernet WAN</th>
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| <th width=200 style="text-align: center;">Mobile WAN</th>
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| </tr>
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| <tr>
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| <td style="text-align: left; font-weight: bold">Ethernet LAN</td>
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| <td>unchanged</td>
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| {{#ifeq:{{{wifi}}}|1|<td>unchanged</td>|}}
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| <td>50</td>
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| <td>unchanged</td>
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| </tr>
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| {{#ifeq:{{{wifi}}}|1|<tr>
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| <td style="text-align: left; font-weight: bold">WiFi LAN</td>
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| <td>unchanged</td>
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| <td>unchanged</td>
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| <td>50</td>
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| <td>unchanged</td>
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| </tr>
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| |}} <tr>
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| <td style="text-align: left; font-weight: bold">Ethernet WAN</td>
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| <td>50</td>
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| {{#ifeq:{{{wifi}}}|1|<td>50</td>|}}
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| <td>unchanged</td>
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| <td>unchanged</td>
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| </tr>
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| <tr>
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| <td style="text-align: left; font-weight: bold">Mobile WAN</td>
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| <td>unchanged</td>
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| {{#ifeq:{{{wifi}}}|1|<td>unchanged</td>|}}
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| <td>unchanged</td>
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| <td>unchanged</td>
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| </tr>
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| </table>
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| Please take caution when using SQM to limit speeds in order to avoid unexpected results.
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| ==Add New SQM Configuration==
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| The <b>Add New SQM Configuration</b> is used to create new SQM instances. Simply enter a custom name for the new instance and click the 'Add' button. You will find the newly added instance in the "[[{{{name}}}_QoS#Smart_Queue_Management|Smart Queue Management]]" section right above this one.
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| [[File:Networking_all_manual_qos_and_new_sqm.png|border|class=tlt-border]]
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| [[Category:{{{name}}} Services section]]
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