RFC 4891:Using IPsec to Secure IPv6-in-IPv4 Tunnel...
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IP address


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... RANGE. The starting address is zero IP address and the end address is all zeroes for ID_IPV6 ...


... crude form of mobility and in scenarios where the NAT changes the IP addresses frequently. However, as the outer address may change, this might introduce new security issues ...
... In particular, using manually configured tunneling is an operational challenge with dynamic IP addresses, because both ends need to be reconfigured if an address changes. Therefore, an easy and efficient ...
... way to re-establish the IPsec tunnel if the IP address changes would be desirable. MOBIKE [RFC4555 ...



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