[lacnog] KEA DHCPv6 Server Prefix len 128

Mar Sep 21 11:31:44 -03 2021

Hola Estimados

Les escribo pq estoy haciendo pruebas en un laboratorio con el KEA DHCPv6
Server y necesito consultar.

Lo q estoy viendo es q me entrega prefijos de tamaño 128 y eso me llama la
atención pq la subnet está declarada como /64

Es correcto esto?

Este es el lab  y los logs

Router (R1)             DHCP Server (Kea)

     |                                     |

     |                                     |
======switch =========================
              |                                       

              |                            

       PC(dhcp)                                  

Config del Kea:

    "subnet6": [

        {

            // This defines the whole subnet. Kea will use this information
to

            "subnet": "2800:c51:20::/64",

            "pools": [ { "pool": "2800:c51:20::20-2800:c51:20::ffff" } ],

            "interface": "ens160",

           "option-data": [

                {

                    "name": "dns-servers",

                     "data": "2001:4860:4860::8888, 2001:4860:4860::8844"

                }

            ]

Logs kea

2021-09-20 10:25:29.374 INFO  [kea-dhcp6.leases/1938] DHCP6_LEASE_ADVERT
duid=[00:01:00:01:26:71:6b:6d:00:0c:29:b3:3c:04], tid=0x22db2b: lease for
address 2800:c51:20::35 and iaid=469765161 will be advertised

2021-09-20 10:25:29.375 INFO  [kea-dhcp6.leases/1938] DHCP6_LEASE_ALLOC
duid=[00:01:00:01:26:71:6b:6d:00:0c:29:b3:3c:04], tid=0x22db2b: lease for
address 2800:c51:20::35 and iaid=469765161 has been allocated for 4000
seconds

root en vm4:/home/operador# cat /var/lib/kea/kea-leases6.csv

address,duid,valid_lifetime,expire,subnet_id,pref_lifetime,lease_type,iaid,p
refix_len,fqdn_fwd,fqdn_rev,hostname,hwaddr,state,user_context

2800:c51:20::35,00:01:00:01:26:71:6b:6d:00:0c:29:b3:3c:04,4000,1632148329,1,
3000,0,469765161,128,0,0,operador-pc.,00:0c:29:b3:3c:04,0,

root en vm4s04p10:/home/operador#

Windows 7

Adaptador de Ethernet V200:

  Sufijo DNS específico para la conexión. . :

  Dirección IPv6 . . . . . . . . . . : 2800:c51:20::35

  Vínculo: dirección IPv6 local. . . : fe80::a592:eb1a:7bf2:d8b2%15

  Dirección IPv4 de configuración automática: 169.254.216.178

  Máscara de subred . . . . . . . . . . . . : 255.255.0.0

  Puerta de enlace predeterminada . . . . . : fe80::f61d:6bff:fe64:95c6%15

Ubuntu

2: ens160: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state
UP group default qlen 1000

    link/ether 00:0c:29:10:39:83 brd ff:ff:ff:ff:ff:ff

       valid_lft forever preferred_lft forever

    inet6 2800:c51:20::25/128 scope global dynamic noprefixroute 

       valid_lft 3919sec preferred_lft 2919sec

    inet6 fe80::20c:29ff:fe10:3983/64 scope link 

       valid_lft forever preferred_lft forever

Captura paquete

DHCPv6

    Message type: Advertise (2)

    Transaction ID: 0x22db2b

    Client Identifier

        Option: Client Identifier (1)

        Length: 14

        DUID: 0001000126716b6d000c29b33c04

        DUID Type: link-layer address plus time (1)

        Hardware type: Ethernet (1)

        DUID Time: Jun  8, 2020 18:34:37.000000000 Hora estándar de
Argentina  TENGO Q ESTUDIAR ESTOS TIMES…

        Link-layer address: 00:0c:29:b3:3c:04

    Server Identifier

        Option: Server Identifier (2)

        Length: 14

        DUID: 00010001288993ad000c2936ae97

        DUID Type: link-layer address plus time (1)

        Hardware type: Ethernet (1)

        DUID Time: Jul 20, 2021 11:01:17.000000000 Hora estándar de
Argentina

        Link-layer address: 00:0c:29:36:ae:97

    Identity Association for Non-temporary Address

        Option: Identity Association for Non-temporary Address (3)

        Length: 40

        IAID: 1c000c29

        T1: 1000

        T2: 2000

        IA Address

            Option: IA Address (5)

            Length: 24

            IPv6 address: 2800:c51:20::35

            Preferred lifetime: 3000

            Valid lifetime: 4000

    DNS recursive name server

        Option: DNS recursive name server (23)

        Length: 32

        1 DNS server address: 2001:4860:4860::8888

         2 DNS server address: 2001:4860:4860::8844

    Client Fully Qualified Domain Name

        Option: Client Fully Qualified Domain Name (39)

        Length: 14

        Flags: 0x04  [CLIENT SHALL update AAAA RRs; SERVER SHALL NOT perform
any DNS updates]

            .... .1.. = N bit: Server SHOULD NOT perform PTR RR updates

            .... ..0. = O bit: Server HAS NOT overridden client's S bit
preference

            .... ...0 = S bit: Server SHOULD NOT perform AAAA RR updates

        Top Level Domain name (TLD): operador-pc.

            WARNING: TLDs are rarely resolvable 

                [Expert Info (Warning/Comment): WARNING: TLDs are rarely
resolvable ]

                    [WARNING: TLDs are rarely resolvable ]

                    [Severity level: Warning]

                    [Group: Comment]

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