Re: tc and IPv6 : any experiences ?

On Fri, Jan 13, 2017 at 5:49 AM, Alan Goodman
<[email protected]> wrote:
> 'Just works' for me.
>
> TF + HFSC + FQ_Codel.  QoS categoriser written in iptables rules which mark
> the traffic was 'cloned' across using ip6tables. Slight adjustments needed.

I pointed to a common mistake folk tend to make when dealing with
ipv6, in writing a filter rule, or a default bin, here:

https://www.bufferbloat.net/projects/cerowrt/wiki/Wondershaper_Must_Die/

When I started that rant I was seeing in nearly every off the shelf
shaper a tc pattern match that looked like this:

tc filter add dev $DEV parent ffff: protocol ip prio 50 u32 match ip src \
   0.0.0.0/0 police rate ${DOWNLINK}kbit burst 10k drop flowid :1

Instead of

tc filter add dev ${DEV} parent ffff: protocol all match u32 0 0 \
police rate ${DOWNLINK}kbit burst 100k drop flowid :1


Not matching protocol "all", thus ipv4 only - and thus the instant you
added ipv6 to a network, the shaper (or policer in this case),  failed
to shape successfully any traffic. Additional problems listed in the
link above. I went on a search-and-destroy mission on every shaper I
could find that was public to fix it a few years ago, but there's so
much copy/pasted tc code out there...


> Alan
>
>
>
> On 13/01/17 13:21, Willy MANGA wrote:
>>
>> Hello,
>> is there somebody here who can share a little bit how he is using tc
>> with native IPv6 address ?
>>
>> I'm using Debian jessie and I may be wrong but I don't find a good
>> documentation on that topic. :-\
>>
>> Actually, I have a dual network and only shaping v4 traffic [1]
>>
>>
>>
>> 1.
>>
>> https://wiki.auf.org/wikiteki/ZAC/Yaound%C3%A9/Configuration/Contr%C3%B4leDuTraffic
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>
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-- 
Dave Täht
Let's go make home routers and wifi faster! With better software!
http://blog.cerowrt.org