IPv6 Network Design
D ES I GN I NG A SC A L AB L E I PV 6 A DDR E SS IN G SC H EM E
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IPv6 Network Design: A Scalable Addressing Scheme, Summaries of Network Design
training network design and architect cable fiber another equitment
Typology: Summaries
2022/2023
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IPv6 Network Design
D E S I G N I N G A S C A L A B L E I P V 6 A D D R E S S I N G S C H E M E
IPv6 Overview
- (^) 128 bit address field
- (^) Subnet mask works exactly like an IPv4 address, just longer
2001:0DB8:0000:0000:0123:4567:89AB
- (^) Address compression rules:
- (^) Remove all preceding 0s in a hextet
- (^) *Replace contiguous hextets of 0s with :: |16 bits| |------------------128 bits-----------------|
- (^) 8 hextets, separated by colons 2001:DB8::123:4567:89AB
- Once per address
Private vs. Public Addressing
- (^) Private addresses are not routable on the internet, just like IPv
- (^) Other private address spaces than link-local exist, but are unlikely to be used
- (^) Note: link-local addresses are not routable at all FE80::(first 24 bits of MAC)FFFE(second 24 bits of MAC) MAC = 00:14:22:01:23: Link-local = FE80::0014:22FF:FE01: Link-local: Global addresses: Start with 2001::/ 2001:0DB8::/32 is a reserved prefix for example documentation NAT exists, but generally isn’t needed because all devices will have a publicly routable address
IPv6 Design
- (^) Overall, use the same practices as with IPv
- (^) Still separate voice and data networks
- (^) Design with summarization in mind
- (^) Create an addressing plan and stick to it
- (^) Summarization can be more difficult due to the large/unfamiliar address space
Migrating to IPv6 cont.
- (^) Option 2: Dual Stack (HIGHLY RECOMMENDED) Images courtesy of Ciscopress.com
Q&A With respect to IPv6 addressing, from a design perspective, which of these statements is important to keep in mind? A. IPv6 addressing provides convenience of anycast addressing without any configuration requirements. B. IPv6 does not use multicast addressing. C. An IPv6 router will not forward packets from one link to other links if the packet has either a link-local source or a link-local destination address. D. Dynamic address assignment requires DHCPv6.