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Why do I need to specify a subnet mask when configuring a NAT address pool?

April 26, 2017address configuring mask NAT pool specify subnet

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Why do I need to specify a subnet mask when configuring a NAT address pool?

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The subnet mask is used to sanity-check the addresses allocated from the pool (so we don’t allocate the subnet broadcast address, for example). The subnet mask must match the size of the subnet into which you are translating.