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发表于 2008-9-26 23:33:36
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显示全部楼层
对某些application(比如游戏、多媒体)不支持,是NAT的一个问题(issue)
你看看NAT设备的手册,应该可以设置的
Protocol-Specific Issues
NAT should be transparent to the end systems that send packets through it. However, many
applications—both commercial applications and applications that are part of the TCP/IP protocol
suite—use the IP addresses. Information within the data field may be based on an IP address, or an
IP address itself may be carried in the data field. If NAT translates an address in the IP header
without being aware of the effects on the data, the application breaks.
应用层数据含有IP地址或端口
Table 4-1 lists the applications that Cisco's NAT implementation supports. For the applications listed
as carrying IP address information in the application data, NAT is aware of those applications and
makes the appropriate corrections to the data. |
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