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  1. #1
    Untangle Ninja
    Join Date
    May 2008
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    1,286

    Default Buffer bloat? Tunnel VPN

    I am running 14.0.0.20180708T220812.a149ea738a-1stretch. I am using Fair/Flow Queueing + Codel (fq_codel). All seems fine, dslreports speed test shows mostly A for buffer bloat. Steaming tv does not lag during a speed test.

    I enabled tunnel vpn and set it up. Assigned the tv to this vpn. Under normal usage all is fine. Running a speed test shows normal scores. The tv lags or buffers during the test. It seems to happen during the upload part of the test. That could be misleading because the tv has some buffering.

    Thanks

  2. #2
    Untangler jcoffin's Avatar
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    Aug 2008
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    Default

    VPN is always going to increase lag over non-encrypted traffic. Boxes at both end of the VPN are re-packaging the packets into new ones. That is overhead no matter how small.
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  3. #3
    Untangle Ninja
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    May 2008
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    Default

    After a little more testing. Dropping the long tested 85% upload speed to 80% seems to have it working ok. Is that overhead? Or is it the tunnel not in the fair que?

  4. #4
    Untanglit
    Join Date
    Dec 2016
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    22

    Default

    a VPN is always going to add significant packet overhead. and 20% doesn't sound unreasonable.

  5. #5
    Untangle Ninja
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    Default

    Quote Originally Posted by cdmarshall View Post
    a VPN is always going to add significant packet overhead. and 20% doesn't sound unreasonable.
    Well it can get better. http://blog.cerowrt.org/post/wireguard/ So I hope they haven't given up yet.

    Hopefully they are already working on this. https://www.bufferbloat.net/projects/codel/wiki/Cake/

  6. #6
    Untangle Ninja
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    May 2008
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    Default

    I see openwrt 18.06 now has cake support. Maybe the devs can look at that.

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