A site-to-site IPsec tunnel drops whenever the internal host address falls into the carrier-grade NAT range of the ISP. Which combination of settings resolves this?
Answers
AChange the outside interface to use a private IP address
BSet a real local subnet, configure NAT traversal, and use a floating static route to the tunnel
CDisable NAT traversal so the tunnel keeps its original addresses
DIncrease the ISAKMP lifetime so NAT binding is not refreshed
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