[nat64] ensure to extend mapping lifetime on reuse (#11866) Previously, a NAT64 mapping's lifetime was only extended upon its initial allocation. This meant that if an existing mapping was found and reused, its expiration timer would not be refreshed, potentially leading to its premature removal. This change moves the `mapping->Touch()` call from `AllocateMapping()` to `TranslateFromIp6()`. This ensures that a mapping's lifetime is extended every time it is used for translation, whether it is newly allocated or an existing one being reused.
OpenThread released by Google is...
...an open-source implementation of the Thread networking protocol. Google Nest has released OpenThread to make the technology used in Nest products more broadly available to developers to accelerate the development of products for the connected home.
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