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四种不同的代理方式

王朝other·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

The four types defined in are:

Full Cone: A full cone NAT is one where all requests from the

same internal IP address and port are mapped to the same

external IP address and port. Furthermore, any external

host can send a packet to the internal host, by sending a

packet to the mapped external address.

Restricted Cone: A restricted cone NAT is one where all requests

from the same internal IP address and port are mapped to

the same external IP address and port. Unlike a full cone

NAT, an external host (with IP address X) can send a packet

to the internal host only if the internal host had

previously sent a packet to IP address X.

Port Restricted Cone: A port restricted cone NAT is like a

restricted cone NAT, but the restriction includes port

numbers. Specifically, an external host can send a packet,

with source IP address X and source port P, to the internal

host only if the internal host had previously sent a packet

to IP address X and port P.

Symmetric: A symmetric NAT is one where all requests from the

same internal IP address and port, to a specific

destination IP address and port, are mapped to the same

external IP address and port. If the same host sends a

packet with the same source port, but to a different

destination, a different mapping is used. Furthermore, only

the external host that receives a packet can send a UDP

packet back to the internal host.

 
 
 
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