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<p>The 'less wrong' overhead figure is 12. The incumbent telco BT
who provide access to the 'last mile' (or the bit from the nearest
FTTC cabinet and the property) use a VLAN tag, adding another 4
bytes to each frame going over the wire. <br>
</p>
<p><br>
</p>
<p>The above guesswork based on SIN498
<a class="moz-txt-link-freetext" href="http://www.sinet.bt.com/sinet/SINs/">http://www.sinet.bt.com/sinet/SINs/</a> (and inspection of the
default settings on a BT supplied modem) I offer it as in theory
being 'less wrong' rather than a practical 'correct'.<br>
</p>
<br>
<div class="moz-cite-prefix">On 23/08/16 16:13, <a class="moz-txt-link-abbreviated" href="mailto:techicist@gmail.com">techicist@gmail.com</a>
wrote:<br>
</div>
<blockquote
cite="mid:CANiaOCnzMOh486gzv=hu7A7zwpA1s52EV1KR+DXBqrowOU2qRg@mail.gmail.com"
type="cite">
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<div class="gmail_extra">Hello,</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">Thank you for your quick reply.</div>
<div class="gmail_extra"><br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I
take it that one of the DHCPs should read PPPoE?</blockquote>
<div><br>
</div>
<div>Yes, you are quite correct. It should read: "TalkTalk uses
DHCP to obtain an IP address and not PPPoE as most other ISPs
do." But I think you understood that :)</div>
<div><br>
</div>
<div>My sync speeds on VDSL2 have been very stable for the last
84+ days so my calculated figures will stay the same for some
time, I would like to think. My DS sync speed is 58976Kbps and
thus I have calculated a reference value of 58068Kbps based on
your formula. The US sync speed is 10422Kbps and the reference
value for this is 10261Kbps.</div>
<div><br>
</div>
<div>Setting the reference values to 50%, I have: 29034Kbps for
the DS; and 5130Kbps for the US. I will test with these
numbers shortly. Am I right to assume I can just paste these
into the SQM interface on LuCI? I will set the "Queuing
discipline" to <i>cake</i> and the "Queue setup script" to <i>piece_of_cake.qos</i>.</div>
<div><br>
</div>
<div>I assume also at this stage, to set "Which link layer to
account for" as <i>none (default)</i>?</div>
<div><br>
</div>
<div>I will then increment the values I have pasted into LuCI
(assuming that is correct) as you have said. At this point,
with an assumed overhead of 8, do I just choose <i>Ethernet
with overhead...</i> and then set the "Per Packet Overhead
(byte)" to <i>8</i>?</div>
<div><br>
Is there any benefit of going through UCI?</div>
</div>
<br>
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</blockquote>
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