Seems like my Windows 7 box (with 2 NICs if that's relevant) requires an ARP response before it sends packets to a certain IP address. The specific context I'm in is running a TFTP server (TFTPD32). The server hears the request, sends out an ARP request, but never sends a response to the TFTP client, presumably because the client doesn't respond to ARP (I can't change that unfortunately). Is there a work around to this miserable situation? This "just worked" on previous versions of Windows.