티스토리 뷰
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
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.
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