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Good day! I can not configure a connection to a PPTP server. Everything else works perfectly. But when trying to connect pptp, the error "GRE: Bad checksum from pppd (fwd)" occurs. I tried to find information on the Internet and came across this article https://www.linux-kvm.org/page/NetworkingTodo. It says "Kernel not support more type of GSO: FCOE, GRE, UDP_TUNNEL". This is about virtio kernel. Is it true?

In addition. I am migrating from HyperV to KVM. There were no problems on HyperV. On KVM pptp is not forwarded. Configuration: mcvtap - bridge.
Monday, August 03 2020, 04:40 AM
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  • Accepted Answer

    Monday, August 03 2020, 12:46 PM - #Permalink
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    From ClearOS, what do you get from:
    iptables -nvL INPUT
    Please put the result between code tags.
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  • Accepted Answer

    Monday, August 03 2020, 07:18 AM - #Permalink
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    I am using ClearOS as my gateway. I used to use Windows for the host, but now I want to use ClearOS for the host as well. I moved the VM to KVM and everything works fine except pptp.
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  • Accepted Answer

    Monday, August 03 2020, 06:58 AM - #Permalink
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    Where is ClearOS in this? Is it the guest you are moving? Are you trying to use ClearOS as the PPTP server of client? I think this is often a GRE issue where it is not reaching the server.
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