I'd never understood what the ifb4 interface was for. Here's a nice
diagram from an sqm-scripts GitHub issue.
Ken
-------- Forwarded Message --------
Subject: Re: [tohojo/sqm-scripts] diagram needed (#125)
Date: Tue, 17 Nov 2020 19:36:47 -0800
From: taggart <[email protected]>
Reply-To: tohojo/sqm-scripts
<reply+aanbo2fkvlzpl3bobmdnblv5yb345evbnhhcy2d...@reply.github.com>
To: tohojo/sqm-scripts <[email protected]>
CC: Subscribed <[email protected]>
Well it's not great, maybe something like this
example
<https://user-images.githubusercontent.com/476401/99479609-5ad1a580-290b-11eb-8a36-e8e0757431c2.png>
Here's the dia file (gzip'd cause github)
example.dia.gz
<https://github.com/tohojo/sqm-scripts/files/5557551/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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