Lecture 2 IPv6 addressing-v3.pdf

Fffe 11111111 11111110 is inserted between the oui

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2. FFFE (11111111 11111110) is inserted between the OUI and device identifier 3. Flip the U/L bit 4. Convert binary to hexadecimal CAB440 Network and Systems Administration 36
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Modified EUI-64 format 0000 0000 0101 0000 00111110 0001 0010 0011 0100 0101 0110 1111 1111 1111 1110 OUI Device ID 00 50 3E 12 34 56 0000 0000 0101 0000 00111110 0001 0010 0011 0100 0101 0110 0000 00 1 0 0101 0000 00111110 0001 0010 0011 0100 0101 0110 1111 1111 1111 1110 02 50 3E 12 34 56 FF FE 1: Split the MAC address 2: insert FFFE 3 Flip the U/L bit 4. Convert to hex CAB440 Network and Systems Administration 37
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IPv6 Unnumbered configuration The ip unnumbered command borrows the IP address from the specified interface to the interface on which the command has been configured Use of the ip unnumbered command results in the IP address being shared by two interfaces. Unavailable for remote testing and management Works on point-to-point interfaces only router(config)# interface g0/0/0 router(config-if)# ipv6 address 2001:DB8:ABCD:1234::1/64 router(config)# interface s0/1/0 router(config-if)# ipv6 unnumbered g0/0/0 CAB440 Network and Systems Administration 38
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Dynamic configuration Stateless Address Autoconfiguration (SLAAC) RFC 4862 Uses Neighbor Discovery (ND) protocol to determine the prefix, prefix length, default gateway, other information the interface ID is created using EUI-64 Dynamic Host Configuration Protocol (DHCP) v6 A device an automatically receive its addressing information by using a DHCP server CAB440 Network and Systems Administration 39
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SLAAC process 1. Since booting up, the client sends out a Router Solicitation (RS) message to the local IPv6 router for requesting an Router Advertisement (RA) message 2. The router receives the RS message, it replies with a RA including the prefix and prefix length for the local network 3. Upon the reception of the RA, the client uses modified EUI-64 as the interface ID and prepend the with from the RA to create its global unicast address 4. The client verified this unicast address with Duplicate Address Detection (DAD) before its use CAB440 Network and Systems Administration 40
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IPv6 Link-Local Addresses A type of unicast address Only has to be unique for that link, NOT a routable address Link-local addresses are used Routers use their link-local address as the default gateway address in their Router Advertisements Routers running Enhanced Interior Gateway Routing Protocol (EIGRP) or Open Shortest Path First version 3 (OSPFv3) using link-local addresses to establish adjacencies Dynamic routes in routing tables use the link-local address as their next-hop addresses CAB440 Network and Systems Administration 41
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IPv6 Link-Local Addresses What’s the purpose for link-local address??? for establishing communication across a link in the absence of a globally routable prefix for intentionally limiting the scope of traffic which should not be routed, e.g. routing protocol advertisements A device can create its own link-local address with a DHCPv6 server or a Router Advertisement message FE80::/10 ~ FEBF::/10 ( 1111 1110 10 00 0000 ~ 1111 1110 10 11 1111) 111 1111 10 Interface ID FE80::/1 0 20 bits Remaining 54 bits EUI-64, Random or Manual configuration 64 bits CAB440 Network and Systems Administration 42
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  • Fall '19
  • IP address, Subnetwork, Systems Administration, IPv6 Address Types

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