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    SOLVED: OpenVPN Site2Site, Slow download, Bug ?

    Scheduled Pinned Locked Moved OpenVPN
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    • S
      skyper
      last edited by

      Hi Community,

      i have read/tested a lot, now i need your help.

      The Setup is like:
      Internet -> pfS1  2.2.6<- openVPN ->dual-wan pfS2 2.2.6-> Server (win & Linux)

      Hardware is Xeon CPU 3,3GHz, 1 GB RAM, pfS1 on KVM with virtio network and pfS2 on ESXi with e1000
      Internetspeed on Serverside is wan1: 100 Down and 40 UP, 20ms Latency wan2: 120 down and 7.5 up
      openvpn is setup with udp, preshared key aes256 sha1 (i tried without encryption, with tcp, always with same speed problem)

      Now the Problem is, that on Serverside i cannot get better download-speed than 2-3 MBit. Tested downloading a file from a webserver, that without openvpn-tunnel has 80mbit.
      Interesting is, that the upload speed is 35mbit over openvpn !

      what can i try? or how can i check for problems, don't know the tcpdump commands. any problems with kvm/virtio?

      i tried all kinds of tun-mtu mssfix fragment sndbuf rcvbuf and net.inet.ip.fastforwarding without great changes.

      HEEELP :-)

      wish you a merry christmas

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      • S
        skyper
        last edited by

        Found it!!

        With the current (2014-06-11) state of VirtIO network drivers in FreeBSD, it is necessary to check the Disable hardware checksum offload box under System > Advanced on the Networking tab and to manually reboot pfSense after saving the setting,

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