Re: DHCPv6 host route in client side

Just to complement, there is a draft that proposes adding some route
options to DHCPv6, so it might come some day when nd be reduced to ARPv6
so to say :)

But for the time being, DHCPv6 shall no talk about routes...
-Carlos

Cristian Matei @ 25/04/2014 08:12 -0300 dixit:
> Hi,
>
> IPv6 dynamic address assignment was scoped to work with SLAAC.
> DHCPv6 does NOT carry a network mask, thus the client will always install
> a /128 IPv6 address. The client will learn the network mask and directly
> connected subnet from ND messages; if the client is a Cisco device, in
> order to make this work and install a route for the directly
> connected/attached subnet you need the interface-level command "ipv6 nd
> autoconfig prefix2 and the global command (which is default) "ipv6 nd
> route-owner2; and of course to install a IPv6 route you need IPv6
> unicst-routing enabled on the client.
> DHCPv6 does NOT carry a default gateway, thus the client will learn the
> default-router from ND messages; if the client is a Cisco device, in order
> to make this work which translates to installing a default route, you need
> the interface-level command "ipv6 nd autoconfig default-route2 and the
> global commands "ipv6 nd route-owner2 , 3ipv6 unicast-routing2.
>
> So there is no bug, it9s a feature.
>
> Regards,
>
> Cristian Matei, 2 x CCIE #23684 (R&S/SC)
> cmatei_at_INE.com
>
> Internetwork Expert, Inc.
> http://www.INE.com
>
>
>
>
> On 25/04/14 02:52, "Daniel Barney Briseqo" <daniel.barney.b_at_hotmail.com>
> wrote:
>
>> A /64 since thats what I have in my pool.I am getting /128 so I am not
>> able to
>> communicate with other host in the same network.
>>
>>> Date: Thu, 24 Apr 2014 06:45:17 -0300
>>> From: tron_at_huapi.ba.ar
>>> To: daniel.barney.b_at_hotmail.com; ccielab_at_groupstudy.com
>>> Subject: Re: DHCPv6 host route in client side
>>>
>>> Daniel,
>>> I'm sure asleep, but what exactly is the problem ?
>>> What kind of route do you expect from DHCP ?
>>> -Carlos
>>>
>>> Daniel Barney @ 23/04/2014 23:23 -0300 dixit:
>>>> Hello everyone
>>>> I am studing DHCPv6 and I am having trouble with the prefix my client
>>> is
>>>> taking.
>>>> On my server I have the following config:
>>>>
>>>> SERVER f0/0 ------f0/0 CLIENT
>>>>
>>>> SERVER SIDE:
>>>> interface FastEthernet0/0
>>>> no ip address
>>>> duplex full
>>>> speed auto
>>>> ipv6 address 1991:11::1/64
>>>> ipv6 nd autoconfig prefix
>>>> ipv6 dhcp server TST
>>>> !
>>>> end
>>>>
>>>> !
>>>> ipv6 unicast-routing
>>>> ipv6 cef
>>>> ipv6 dhcp pool TST
>>>> address prefix 1991:11::/64
>>>> domain-name cisco.com
>>>>
>>>>
>>>> CLIENT SIDE
>>>>
>>>> !
>>>> interface FastEthernet0/0
>>>> no ip address
>>>> duplex full
>>>> ipv6 address dhcp
>>>> ipv6 enable
>>>> ipv6 nd autoconfig prefix
>>>> ipv6 nd managed-config-flag
>>>> !
>>>> end
>>>>
>>>> Client does takes an IP but this one is a host route
>>>>
>>>> CLIENT(config-if)#do sh ipv6 route
>>>> IPv6 Routing Table - default - 2 entries
>>>> Codes: C - Connected, L - Local, S - Static, U - Per-user Static route
>>>> B - BGP, M - MIPv6, R - RIP, I1 - ISIS L1
>>>> I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary, D - EIGRP
>>>> EX - EIGRP external, ND - Neighbor Discovery
>>>> O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF
>>> ext
>> 2
>>>> ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2
>>>> LC 1991:11::39E9:5DFD:BAFC:944A/128 [0/0]
>>>> via FastEthernet0/0, receive
>>>> L FF00::/8 [0/0]
>>>> via Null0, receive
>>>>
>>>> I did a bit of research and I found it is a bug and that ipv6 nd
>> autoconfig
>>>> prefix command will istall a /64 since thats what I have in my
>>> pool.But
>> this
>>>> is not working.
>>>>
>>>> Can you guys help me out with this please? I tested this on 12.4T
>>> (Real
>> gear)
>>>> and 15.0M (GNS3) and same behaivor
>>>>
>>>>
>>>> ---
>>>> Daniel Barney Briseqo
>>>> "El ultimo minuto tambiin tiene 60 segundos"
>>>> Cel: (55) 31 00 52 26
>>>>
>>>>
>>>> Blogs and organic groups at http://www.ccie.net
>>>>
>>>>
>>> _______________________________________________________________________
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>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>> --
>>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
>>> _______________________________________________________________________
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>>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
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>>
>>
>>
>>
>>
>>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net