?– The IPv6 address is 128 bits long and is made up of a 48-bit global pre?¬?x, a 16-bit
subnet ID, and a 64-bit interface identi?¬?er.
?– There are several ways to assign IPv6 addresses??”statically, stateless
autocon?¬?guration, and DHCPv6.
?– Cisco supports all the major IPv6 routing protocols??”RIPng, OSPFv3, and EIGRP.
?– Transitioning from IPv4 to IPv6 requires dual stacks, tunneling, and possibly NAT-PT.
?– Use the ipv6 unicast-routing command to enable IPv6 and the ipv6 address ipv6-
address/pre?¬?x-length command to assign interface addresses and enable an IPv6
routing protocol.
Chapter Summary
To conserve the IPv4 address space, you can use three types of Network Address
Translation (NAT): static NAT, dynamic NAT, and Port Address Translation (PAT). Static
NAT provides a one-to-one mapping of inside-local to inside-global addresses. With
Dynamic NAT, the inside global addresses are automatically picked from a pool. PAT, also
known as NAT overloading, allows you to translate many internal addresses into just one
or a few inside global addresses.
IPv6 addresses the exhaustion of IP resources and offers an alternative to conserving
addresses through the use of NAT.
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