Sec17 IPv6

IPv4: 32 bits

IPv6: 128 bits

IPv6 address zero compression

1234:1234:0000:0000:0000:0000:4567:4567 is 1234:1234::4567:4567

IPv6 address leading compression

1234:0000:0000:1234:0011:0022:0033:1234 is 1234::1234:11:22:33:1234

IPv6 Uncompressing

1234:123:AA::BBBB:CCC is 1234:0123:00AA:0000:0000:0000:BBBB:0CCC

Global routing Prefix

IANA(Internet Assigned Numbers Authority) - RIR(Rigional Internet Registries) - ISP(Internet Service Provider) - customer

Subnet ID is normally /48

Out of 128 bits address Global routing prefix(48 bits), Subnet ID(16 bits), Interface ID(64 bits)

use 2811 router to configure ipv6 as they have newer software.

R1(config)#ipv6 unicast-routing

R1(config-if)#ipv6 address 2001:1111:2222:1::/64

R1(config-if)#ipv6 address 2001:1111:2222:1::1/64

show ipv6 interface

show ipv6 interface brief

show ipv6 interface fast 0/0

Link-local adress

FE80::/10 (FE8, FE9, FEA, FEB) FE80:0000:0000:0000

 

interface identifier

flip 7th bit and insert FFFE in the middle.

#ipv6 address 2001:1111:2222:1::/64

NDP (Network discovery protocol) uses FF02::2. DHCP request through FF02:2 and receive ip address through FF02::1 every 200 seconds.

Neighbor solicitation and neighbor advertisment used to discover hosts (same as ARP in ipv4). NS is ARP request. SNMA(solicited-node multicast address) refer to host range with 6 same last hex value. (i.e. FF02::1:3c:2200). SNMA always start with FF02::1:FF. NS is request and NA is reply.

DHCP in IPv6: stateful(similar to ipv4) and stateless. communication between client and server. DORA (Discovery offer request acknwledgement). Stateless DHCP create ip for client itself. closely related to RS/RA.