Posted: Sun Mar 01, 2015 11:15 Post subject: QOS and IPv6
I enable QOS on my RT-AC68U (Firmware:DD-WRT v24-sp2 (02/23/15) std), it works good with IPv4.
But when I enable IPv6 with the rooter then QOS don't work with IPv6 adress.
I test youtube :
- QOS ok if I disable IPv6 : my download speed is limited by my QOS rules, ping is good 50ms.
- but QOS don't work if I enable IPv6 : download speed use my full internet bandwidth and my ping up to 400ms and more.
I try also the speedtest of my ISP ( http://proof.ovh.net/ ): on this speed test I can use IPv4 or IPv6 to test, same as youtube ( QOS ok for IPv4 and not ok for IPv6 ).
What can I do ?
Do I forget a setting for QOS with IPv6 ?
Joined: 10 Jan 2015 Posts: 245 Location: Minnesota
Posted: Sun Mar 01, 2015 11:53 Post subject:
Download speed is not throttled in QoS when using ipv6 (only upload speed is) and i suspect its the way the ipv6 header is designed vs the old ipv4 header as it has less sections for defining router quality of control and simplifies it into its own form of QoS (the ipv6 header has the ability to assign QoS labels without a seperate service running on the router).
But as for bandwidth limiting with ipv6, we need to implement a different mechanism to deal with ipv6
headers. I chose dd-wrt because it has working ipv6 and bandwidth throttling to solve the bufferbloat issue, but also use ipv6. For now keep QoS enabled and we must wait or if anyone else has the answer to limiting ipv6 traffic for them to share. Ipv6 isnt widespread yet so anything latency intensive like gaming or voip will still mostly be over ipv4 for the time being.