SNAT和DNAT之间的区别

1.源网络地址转换(SNAT)：
顾名思义，SNAT是一种在从专用IP地址连接到公用IP地址时通常转换源IP地址的技术。它将请求中的源客户端IP地址映射到BIG-IP设备上定义的转换。当内部主机需要启动与外部主机或公共主机的会话时，将使用NAT的最常见形式。

2.目的网络地址转换(DNAT)：
顾名思义，DNAT是一种在从公共IP地址连接到私有IP地址时通常转换目标IP地址的技术。它通常用于将发往特定IP地址或IP地址上特定端口的数据包重定向到一台主机上，简单地重定向到另一地址，通常是在另一台主机上。

SNAT和DNAT之间的区别：

SNAT	DNAT
It is generally used to change private address or port into a public address or port for packets leaving network.	It is generally used to redirect incoming packets with destination of public address or port to private IP address or port inside network.
It translates source IP address within a connection to BIG-IP system IP address that one defines.	It translates IP addresses of internal servers that are protected by device to public IP addresses.
It is used to change source address of packet.	It is used to change destination address of packet.
It also changes source port in TCP/UDP headers.	It also changes destination port in TCP/UDP headers.
It generally allows multiple hosts on inside to get any host on outside.	It generally allows multiple hosts on outside to get single host on inside.
It is performed after routing decision is made.	It is performed before routing decision is made.
In this, destination IP address is maintained and source IP address is changed.	In this, source IP address is maintained and destination IP address is changed.
Client inside LAN and behind Firewall needs to browse Internet.	Website hosted inside data center behind Firewall and needs to be accessible to users over Internet