Re: [Openvpn-users] UDP checksum incorrect message with linux client and windows server

[Jan J. K. <ja...@ni...>]

Seref Arikan wrote:
> Hi,
> When I use openVPN with an ubuntu client and a windows server, udp 
> packages from client to server are reported with info "udp checksum 
> incorrect" in wireshark.
> Packages from server to client have no problem. The vpn is functioning 
> as it should, but should I be worrying about this? I don't assume it 
> comprimises security, but your response would be much appreciated.
>
>
where is wireshark running? on the ubuntu client? then most likely 
you've got TCP/UDP offloading enabled; this means that the TCP/UDP 
checksums are calculated by the network adapter instead of by the OS. 
This is nice for performance but it does result in wireshark reporting 
'checksum incorrect' messages . It's quite harmless though.

HTH,

JJK