Research about Implementation of IPv4/IPv6 NAT-PT;
Currently, IPv4 uses 32-bit addresses, which are represented as 4 bytes with dots between them.
Eventually, all IPv4 equipment will be replaced by attrition and IPv6 will be the only address protocol in use.
最后，所有的IPv4的设备将被消耗替换，IPv6将是唯一使用的地址协议。
目前，IPv4采用32位地址，这些地址有4个字节，中间用点来分开。
If you're not interested in IPv4, you can change the filter to 6:25 to refer to an IPv6 socket listening on port 25, or simply 6 to mean all IPv6 connections.
IPv6采用128位的地址，可用的单一地址数量为：3.4e+38（34乘以10的38次方），另外它还改正了IPv4里的一些问题，比如数据安全。
随着新的、唯一的IPv4地址供应数量的下降，一些企业和服务提供商使用传统的NAT（网络地址转换）技术作为保持现有地址的措施。
