http://kyouko.net/post/2016-08-05-celnet-asus-rt-ac66u-and-ipv6.html

https://www.polarxiong.com/archives/%E6%95%99%E8%82%B2%E7%BD%91DD-WRT-OpenWrt%E7%94%A8%E4%B8%8AIPv6-%E4%BB%A5%E5%8D%97%E4%BA%AC%E5%A4%A7%E5%AD%A6%E4%B8%BA%E4%BE%8B.html

http://koolshare.cn/thread-24920-1-1.html

ethernet bridging

http://www.microhowto.info/troubleshooting/troubleshooting_ethernet_bridging_on_linux.html

tcpdump tutorial

https://danielmiessler.com/study/tcpdump/#gs.aNCreow

http://www.cnblogs.com/jcli/p/4248145.html

http://www.cnblogs.com/ggjucheng/archive/2012/01/14/2322659.html

http://blog.chenishr.com/?p=543