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who can help in ICMP

According to NAT mechanism, you have studied how NAT does work for each three different types. One of those types was PAT. This type is based on TCP/UDP port in its work to preserve the public IP, also it can deal with ICMP protocol with no trouble. Have asked yourself how can that be acheived? 

Our concern is:

 

 How PAT can deal with ICMP packets while this protocol does not have a port number ? 

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