Re: [lwip-users] VMware

[address@hidden]

Adam Fullerton wrote:
> Hi,
>
> Has anyone experienced problems with machines running through VMware?
>    
No, I have been communicating with an lwIP devices from WinXP inside a 
VM and it works fine.
> What I see is lwIP rejecting packets sent from an application within
> a virtual machine due to checksum mismatch. Wireshark reveals that
> extra non-zero bytes have been added to the outgoing message.
>    
Extra bytes (whether zero or not) should not matter: the checksum should 
only be calculated over the length of the packet which is encoded in the 
IP header. To ensure this, incoming packets are truncated to that length 
in ip_input(). Do you check the checksum before passing the packet to 
ip_input? Because I have already been getting (short ACK-) packets that 
are < 60 bytes and padded with zeroes and that worked fine.

Simon