I'd never understood what the ifb4 interface was for. Here's a nice diagram from an sqm-scripts GitHub issue.

Ken


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Subject: Re: [tohojo/sqm-scripts] diagram needed (#125)
Date: Tue, 17 Nov 2020 19:36:47 -0800
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Well it's not great, maybe something like this
example Here's the dia file (gzip'd cause github)
example.dia.gz

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.

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