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Chapter 9 NAT for IPv4 ((IPv4 NAT provides some benefits:, – NAT conserves…
Chapter 9 NAT for IPv4
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Without NAT, the exhaustion of the IPv4 address space would have occurred well before the year 2000.
NAT has many uses, but its primary use is to conserve public IPv4 addresses. It does this by allowing networks to use private IPv4 addresses internally and providing translation to a public address only when needed.
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Code
Static NAT
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The first task is to create a mapping between the inside local address and the inside global addresses.
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– End-to-end addressing is lost, especially when dynamic NAT is used.
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– NAT complicates tunneling protocols, such as IPsec.
– Services that require the initiation of TCP connections from the outside network, or stateless protocols, such as those using UDP, can be disrupted.