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10.Introducting IPv6 Networks OSPFv6 | DHCPv6 Layer 3 - Coggle Diagram

- - - - Next Header
      - Traffic Class - 8
      - Flow Label - 29
      - Payload Length
      - Hop Limit
      - Source Address - 128
      - Version - 4
      - Destination Address - 128
    - - Fragment
        Fragmentation Extension Header
        not all packets require fragmentation
        
        Reserved
        
        Resv.
        
        0x06(TCP)
        
        Fragment OFfset
        
        M.
        
        Identificcation
  - - - Prefix - network address - 4 octets
      - interface Identifier - host address - 12 octets
    - - Unicast
        Global Routing Prefix - 48 | Subnet ID - 16 | Interface ID - 64
        Global unicast address prefixes are used for public networks
        Prefix ranges are reserved for avarious IP transmission methods
      - Multicast
        11111111 | Flags - 4bits | Scope - 4bits | Group ID - 112bits
        Multicast addresses are distinguished by an FF00::/8 prefix
        Select Multicast address groups are reserved for prtocol use
        Address Range > Desc
        FF02::1 > all nodes addresses (Link Local)
        FF02::2 > All Routers Addresses (Link Local)
      - AnyCast
        means > for some servers theyre providing the same service for having 2 http servers network > we can configure the same unicast address for them
        if a cient wants to access to the servers > they will be accessed the closese server of servers having the same service >> fast connection and saving ressources making the resundancy of the server
        unlike traditional method where we have to change the server ip to the main server ip when when its down
        AnyCast allows multiple instances of a service to be associated with a single address enabling a variety of servicce applications
- - - - LL LinkLayer
        using the LinkLayer Address
      - LLT LinkLayer+Time
        we use the LinkLyer Address and the Time Step to generate the DUID
  - - - Enabilng DHCPv6 Communication
        IPv6 Client <> DHCPv6 server[FF02::1:2, A;; DHCP Relay Agents & Servers]
        Link local addresses are used as source address by clients , DHCP servers reached via the multicast address FF02::1:2
        if the Clinet and DHCP server are not in same Net (not same link) we will need the DHCP relay agent
      - Assigning IPv6 Addressing
        Clinet <> Server
        Discovery of servers and assigning of IPv6 Addresses and configuration parameter relies on a set of 4 params >>
        Clinet >> 1.Solicit(req pv6 address and some params) |
        Server >> 2.Advertise (ipv6 address and some params)
        Clinet >> 3.Request (clinet may recv severale AdvPackets from diffrent servers >> soo it will select the optimal server based on te priority of the server and then it will the multicast the request to tell them which server is the optimal server )
        Server >> 4.Reply >> optimal server will reply to confirm that that ipv6 address is now used by you the client
      - Statful Addressing
        RA contains managed (M) and other (O) configuration flags
        Stateful addressing (DHCPv6) used where flags are set to '1'
        
        if there Router in Net > Clinet Send RS packet >> RT sends back RA packet to provide the prefix for the client
        
        If there is DHCPv6 server in Net so Now Router will send RA that contains the maanged M and other O configurations flags
        
        if (O=1,M=1) > we will use the Stateful addressing >> DHCPv6 server will provide the IPv6 addresss and other params for the client