Issues with raw TCP on darwin

<p>I&#39;m writing a VPN for fun and was hoping to do NAT in Go without relying on the OS. I&#39;m testing this with a simple SYN-ACK ping tool:</p> <p><a href="https://github.com/jpillora/synack/blob/master/main.go">https://github.com/jpillora/synack/blob/master/main.go</a></p> <p>This works under linux. On mac/darwin, it successfully sends but never receives anything.</p> <p>Any ideas?</p> <hr/>**评论：**<br/><br/>Jamo008: <pre><p>Not looking good :( <a href="https://stackoverflow.com/a/29083319/977939">https://stackoverflow.com/a/29083319/977939</a></p> <blockquote> <p>The problem with this is that OS X is based on BSD, and BSD doesn&#39;t allow you to program raw sockets at the TCP level. You have to use go down to the Ethernet level in order to do so.</p> <p>I&#39;m using the pcap library with gopackets to do the job.</p> <p><a href="https://godoc.org/code.google.com/p/gopacket/pcap">https://godoc.org/code.google.com/p/gopacket/pcap</a></p> </blockquote></pre>