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<p>I'd never understood what the ifb4 interface was for. Here's a
nice diagram from an sqm-scripts GitHub issue.</p>
<p>Ken<br>
</p>
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<td>Re: [tohojo/sqm-scripts] diagram needed (#125)</td>
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<td>Tue, 17 Nov 2020 19:36:47 -0800</td>
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<td>taggart <a class="moz-txt-link-rfc2396E" href="mailto:notifications@github.com"><notifications@github.com></a></td>
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<td>tohojo/sqm-scripts
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<p>Well it's not great, maybe something like this<br>
<a target="_blank" rel="noopener noreferrer"
href="https://user-images.githubusercontent.com/476401/99479609-5ad1a580-290b-11eb-8a36-e8e0757431c2.png"
moz-do-not-send="true"><img
src="https://user-images.githubusercontent.com/476401/99479609-5ad1a580-290b-11eb-8a36-e8e0757431c2.png"
alt="example" style="max-width:100%;" moz-do-not-send="true"></a>
Here's the dia file (gzip'd cause github)<br>
<a
href="https://github.com/tohojo/sqm-scripts/files/5557551/example.dia.gz"
moz-do-not-send="true">example.dia.gz</a></p>
<p>I was trying to wrap my head around why ifb4 existed and how it
worked. Maybe it could somehow explain that qdisc's can only
work on packets leaving a device and that's the reason for the
ifb4.</p>
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