CCNA 2 - Capitulo 8.2

CCNA 2 - Capitulo 8.2

1. DYNAMIC GUA ASSIGNMENT IPV6

   • STATELESS
     • SLAAC OVERVIEW
       • NO DEVICE TRACKING THE ASSIGNMENT
       • IS NOT MAINTAINING ANY CLIENT STATE INFORMATION
       • IT WORKS WITHOUT A DHCP SERVER
       • ROUTER USES ICMPv6 RA
         • ARE SENT BY AN IPV6 ROUTER EVERY 200 SECONDS
       • HOSTS CAN ALSO SEND A RS
         • REQUESTING IPV6 ENABLED ROUTER
     • CAN BE DEPLOYED AS TWO METHODS
       • 1) SLAAC ONLY
         • FLAG RA MESSAGE
           • A - 1
             • SUGGESTS TO THE CLIENT THAT IT CREATES OWN IPV6 GUA
               • USING THE PREFIX ADVERTISED IN THE RA
             • PROVIDING ALL INFORMATION
           • O - 0
             • INTRUCT THE CLIENT TO USE ADDITIONAL INFORMATION OF STATELESS DHCPv6
           • M - 0
             • INTRUCT THE CLIENT TO USE THE INFORMATION IN THE RA EXCLUSIVELY
         • HOW DO I ENABLE SLAAC INTERFACE ?
           • ROUTER TO PROVIDE GUA
             • 3) ENABLE IPV6 ROUTING
               • R1(CONFIG)#IPV6 UNICAST-ROUTING
                 • JOINED GROUP ALL-ROUTERS - FF02:02
               • ENABLE THE SENDING OF RA MESSAGES
                 • AN IPV6 ENABLED CISCO ROUTER SENDS RA MESSAGES TO THE IPV6 ALL NODES ROUTERS EVERY 200 SECONDS
               • ONLY SLAAC IS ENABLED BY DEFAULT WHEN COMMAND IS CONFIGURED
             • 2) VERIFY IF INTERFACE CORRECTLY CONFIGURED '
               • R1#SHOW IPV6 INTERFACE G0/1
             • 4) VERIFY SLAAC IS ENABLED
               • R1# SHOW IPV6 INTERFACE G0/0/1 | SECTION JOINED
             • 1) ASSIGN SETTINGS ON THE INTERFACE
               • R1(CONFIG-IF)# IPV6 ADDRESS FE80 :: 1 LINK-LOCAL
               • R1(CONFIG-IF)# IPV6 ADDRESS 2001:DB8 :ACAD:1 :: 1/64
         • ICMP RS MESSAGES
           • IF YOU DO NOT RECEIVE THE RA MESSAGE
             • YOU CAN SEND RS TO THE ROUTER GROUP FOR ALL ROUTERS (FF02::2)
       • 1) STATALESS DHCPv6
         • FLAG RA MESSAGE
           • A - 1
             • ADDRESSING PREFIX
           • O - 1
             • PARAMETERS ADDITIONAL (DNS , DOMAIN NAME )
           • M - 0
             • NONE
         • USES PARTS OF SLAAC TO ENSURE THAT ALL THE NECESSARY INFORMATION IS SUPPLIED TO THE HOST
         • HOW DO I ENABLE ONLY SLAAC INTERFACE ?
           • R1(CONFIG-IF)#IPV6 ND OTHER-CONFIG-FLAG
         • CHECK IF IT IS ENABLED IN THE INTERFACE
           • SHOW IPV6 INTERFACE G0/0/1 | BEGIN ND
         • HOW DO DISABLE SLAAC DHCPv6 INTERFACE ?
           • R1(CONFIG-IF)# NO IPV6 ND OTHER-CONFIG-FLAG
         • CONFIGURE DHCPv6 SERVER
           • CISCO IOS ROUTER CAN BE CONFIGURED TO PRIVEDE
             • STATELESS DHCPv6 SERVER
               • 1 ) ENABLE IPV6 ROUTING
                 • R1(CONFIG)#IPV6 UNICAST-ROUTING
                 • IS REQUIRED TO ENABLE IPV6 ROUTING
               • 2) DEFINE A DHCPv6 POOL NAME
                 • R1(CONFIG)#IPV6 DHCP POOL IPV6-STATELESS
               • 3 ) CONFIGURE THE DHCPV6 POOL
                 • R1(CONFIG-DHCPV6)#DOMAIN-NAME TECNO.COM
                 • (CONFIG-DHCPV6)#DNS - SERVER 2001:ABCD:DB8:ACAD:1::254
                 • CONFIGURED ROUTER TO PROVIDE ADDITIONAL DHCP INFORMATION
               • 4) BIND THE DHCPv6 POOL TO AN INTERFACE
                 • R1(CONFIG-IF)# IPV6 ADDRESS FE80 :: 1 LINK-LOCAL
                 • R1(CONFIG-IF)# IPV6 ADDRESS 2001:DB8 :ACAD:1 :: 1/64
                 • R1(CONFIG-IF)# IPV6 ND OTHER-CONFIG-FLAG
                   • CHANGED FLAG "O" FROM 0 TO 1
                   • RA MESSAGES SEN ON THIS INTERFACE INDICATE ADDITIONAL INFORMATION FROM A STATELESS DHCPv6 SERVER
                 • R1(CONFIG-IF)# IPV6 DHCP SERVER IPV6-STATELESS
               • ROUTER INTERFACE ACQUIRES IPV6 FROM DHCPv6 SERVER
             • STATELESS DHCPv6 CLIENT
               • 1 ) ENABLE IPV6 ROUTING THE CLIENT
                 • R1(CONFIG)#IPV6 UNICAST-ROUTING
                   • JOINED GROUP ALL-ROUTERS - FF02:001
               • 2 ) CONFIGURE CLIENT ROUTER TO CREATE AN LLA
                 • R3(CONFIG-IF)# IPV6 ENABLE
               • 3 ) CONFIGURE CLIENT ROUTER TO USE SLAAC
                 • R3(CONFIG-IF)#IPV6 ADDRESS AUTOCONFIG
               • 4 ) VERIFY THAT THE CLIENT ROUTER IS ASSIGNED A GUA
                 • R3#SHOW IPV6 INTERFACE BRIEF
               • 5 ) VERIFY THAT THE CLIENT ROUTER RECEIVED OTHER NECESSARY IPV4 INFORMATION
                 • R3# SHOW IPV6 DHCP INTERFACE G0/0/1

2. HOST PROCESS TO GENERATE INTERFACE ID

   • RANDOMLY GENERATED
     • EX : WINDOWS 10 USES THIS
   • EUI-64
     • 1 - HOSTS CREATES AN INTERFACE ID USING ITS 48 bit MAC
     • 2 - HOST INSERTS THE HEX VALUE OF fffe IN THE MIDLE OF THE ADDRESS
   • USING SLAAC , A HOST TIPICALLY ACQUIRES ITS 64-bit IPV6 SUBNET FROM THE ROUTER RA

3. DUPLICATED ADDRESS DETECTION (DAD)

   • SLAAC IS A STATLESS , THEN DAD IS USED BY A HOST TO ENSURE THAT THE IPV6 GUA IS UNIQUE
   • IS IMPLEMENTED USING ICMPv6
     • 1 - HOST SEND AN NEIGHBOR SOLICITATION (NS)
       • WITH A SOLICITED-NODE MULTICAST ADDRESS (FF02::1)
     • 2- IF NO OTHER DEVICES RESPOND , WITH A NA MESSAGE , THEN ADDRESS TO BE UNIQUE
   • MUST BE USED OF WHETHER IT IS CREATED USING SLAAC ONLY , DHCPv6 , SLAAC WITH DHCPv6