NAT-PTNetwork Address Translation - Protocol Translation
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In the NAT-PT technique the address and the IPv6 protocol are translated into IPv4, that is, the packet will travel with an IP address assigned in the mapping that contains the IPv6/IPv4 router (Table 3).
The NAT-PT technique has fragmentation problems, which is a disadvantage when sending large packets, given that it needs the support of other techniques to carry out a correct fragmentation.
Within the network, DirectAccess relies on NAT-PT (Network Address Translation-Protocol Translation) to provide connectivity between DirectAccess and IPv4 resources.