[Cake] Enforcing video quality question

John Sager john at sager.me.uk
Fri Feb 19 07:16:48 EST 2021

That's basically what I do. I set marks on outgoing traffic in the mangle 
table which are copied to connmark before egress. Then on ingress the 
connmark is restored to the packet and punted to ifb0 using 'action connmark 
action mirred egress redirect dev $IFB' as an ingress filter on the incoming 
interface (ppp0 in my case). Then I have HTB classes on ifb0 which set rate 
limits for different traffic classes indicated by the marks. I have only 6 
traffic classes (I bundle all video into one class), but as marks are 32 
bits wide there is lots of scope for classes for individual IP addresses.


On 18/02/2021 19:28, Toke Høiland-Jørgensen via Cake wrote:
> Peter Lepeska <bizzbyster at gmail.com> writes:
>> A user on the OpenWrt forum suggested hashlimit rules supported by
>> iptables. How does that idea sound to you?
> That will result in a cliff-edge policer (i.e., as soon as a device goes
> over its limits it will see every packet get dropped). This doesn't
> interact too well with the burstiness of TCP, so you'll likely get
> erratic behaviour of the traffic if you do that. Doing the same thing
> with HTB means the router will queue+shape each class (and with FQ-CoDel
> on the leaves, you'll get a nice AQM behaviour as well), so that will be
> smoother and less prone to bloat :)
> -Toke
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