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qos: warning about possible IFB error

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currite 2020-10-23 19:31:38 +02:00
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commit ed9449fa47
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@ -1083,9 +1083,9 @@ parameters.
.. note:: If you configure a class for **VoIP traffic**, don't give it any
*ceiling*, otherwise new VoIP calls could start when there is available
bandwidth and get suddenly dropped when other classes start using
their bandwidth.
*ceiling*, otherwise new VoIP calls could start when the link is
available and get suddenly dropped when other classes start using
their assigned *bandwidth* share.
Example
@ -1182,7 +1182,12 @@ That is how it is possible to do the so-called "ingress shaping".
set interfaces input ifb0 traffic-policy out MY-INGRESS-SHAPING
set interfaces ethernet eth0 redirect ifb0
.. warning::
Do not configure IFB as the first step. First create everything else
of your traffic-policy, and then you can configure IFB.
Otherwise you might get the ``RTNETLINK answer: File exists`` error,
which can be solved with ``sudo ip link delete ifb0``.
.. _that can give you a great deal of flexibility: https://blog.vyos.io/using-the-policy-route-and-packet-marking-for-custom-qos-matches