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QUIC Issue

Discussion in 'Asuswrt-Merlin' started by haoel, Aug 11, 2016.

  1. haoel

    haoel New Around Here

    Aug 11, 2016
    I currently use ASUS RT-AC68U 1900M router, and upgraded the RT-AC68U_380.61_0.trx firmware.

    I active the VPN(PPTP) connection in router, and enable some static route rules and the dnsmasq.conf.add for different DSN servers.

    Everything looks fine except to access the Google website by Chrome (Safari and Firefox no problem)

    After I did some investigation, I found the Chrome uses QUIC protocol to access thewww.google.com or www.youtube.com website, and this cause the problem.

    I made the following tests:

    1) Using my laptop connect to the VPN directly, and Chrome can load the Google and Youtube website successfully via QUIC protocol. So, I think both my laptop and VPN haven't the problem.

    2) I disabled the Chrome's QUIC protocol - chrome://flags/#enable-quic , and Chrome using HTTPS, everything's fine. (scenario: laptop -> router -> vpn -> Google)

    So, I think the problem might be the router has some problem with QUIC protocol, and some articles said the router's QoS setting could make the QUIC problem, but I've never enabled the QoS setting in router.

    Anyone can help on this?
  2. eddiez

    eddiez Senior Member

    Jun 29, 2015
    Please take into account that QUIC is very much experimental! So blaming a router for causing issues is not really realistic.

    Regardless of that, no issues here with QUIC connections although not connected through VPN. VPN could also be the source of the issue...
    evh909 likes this.
  3. haoel

    haoel New Around Here

    Aug 11, 2016
    Hey, eddiez,I am not blaming router. Please don't get me wrong. As I mentioned, I use my laptop connect to VPN directly, and QUIC works fine. I just natively think it shouldn't be the problem of VPN.

    Here, I just want to understand how the route deal with QUIC connection, I hope you can teach me how to investigate/debug this issue, guide me to do more deep investigation.
  4. Nullity

    Nullity Very Senior Member

    Jul 17, 2014
    Use tcpdump (either on the router, your client, or both) to create a packet capture then use Wireshark to see what's happening.

    Are other UDP-based protocols having problems or is QUIC the only one?
  5. xendrome

    xendrome New Around Here

    Mar 20, 2016
    Just to jump in on this, looking at QOS per devices, QUIC is being shown as "Web Surfing" traffic and not "Video and Audio Streaming" if I go to youtube in Chome 56.0.2924.76 on an RT-AC5300 on 380.64_2

    If I disable QUIC in Chrome using - chrome://flags/#enable-quic - it shows as Youtube traffic and is counted properly under "Video and Audio Streaming"