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=====
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NPTv6
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=====
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Network Prefix Translation, shortened to NPTv6, is used to translate IPv6 addresses. A common usage for this
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is to translate global ("WAN") IPs to local ones. In this regard, it is similar to NAT, although NPTv6 can only be
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used to map addresses one-to-one, unlike NAT which typically translates one external IP to several internal ones.
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NPTv6 routes are listed at :menuselection:`Firewall --> NAT --> NPTv6`. New rules can be added by clicking **Add** in the upper right
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corner. A quick overview of the fields:
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============================= =======================================================================================================================================================================
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Disabled Disables this rule without having to remove it.
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Interface Which interface this rule should apply to. Most of the time, this will be the WAN interface.
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Description A description to easily indentify the purpose of this rule in the overview.
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**Internal IPv6 Prefix**
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Source / Invert Use this option to invert the sense of the source address match.
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Source / Address The internal (LAN) ULA IPv6 Prefix for the Network Prefix Translation. The prefix size specified for the internal IPv6 prefix will be applied to the external prefix.
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**Destination IPv6 Prefix**
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Destination / Invert Use this option to invert the sense of the destination address match.
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Destination / Address The Global Unicast routable IPv6 prefix.
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============================= =======================================================================================================================================================================
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