Thanks Stuart. This is a KVM virtual machine with all offloads settings 
disabled for the guest ... I will try to enable and see how it goes ...

-- 
Regards,
C. L. Martinez

On 15/03/2020, 17:41, "owner-m...@openbsd.org on behalf of Stuart Henderson" 
<owner-m...@openbsd.org on behalf of s...@spacehopper.org> wrote:

    On 2020-03-15, Carlos Lopez <clo...@outlook.com> wrote:
    > Good morning,
    >
    >  I've been seeing a lot of "bad ip cksum" error messages in my OpenBSD’s 
Tor gateway, like these:
    
    from the tcpdump manual:
    
       IP and Protocol Checksum Offload
       Some network cards support IP and/or protocol checksum offload.  Packet
       headers for such interfaces erroneously indicate a bad checksum, since 
the
       checksum is not calculated until after tcpdump sees the packet.
    
    
    

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