Re: DHCPv6 host route in client side

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
>> >
>> >
>>_______________________________________________________________________
>> > Subscription information may be found at:
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>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>> --
>> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>
>
>Blogs and organic groups at http://www.ccie.net
>
>_______________________________________________________________________
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Received on Fri Apr 25 2014 - 06:12:52 ART