DHCPv6 stateful configuration

[stillspringwater]

Hey guys, just trying to set up a stateful configuration between a windows 7 client and and cisco 3725 router. Ive read through the sticky dhcpv6 topic but the confiuration is slightly different to my router.

conf t

ipv6 unicast-routing

ipv6 dhcp pool testpool

prefix-delegation pool salespool lifetime infinite infinite

exit

int fa0/0

ipv6 address 2001:db8:55:10::1/64

ipv6 dhcp server testpool

no shut

exit

ipv6 local pool salespool 2001:db8:55::/48 64

exit

debug ipv6 dhcp detail

Im having no problem when performing a stateless confiuration, but when I run a debug on staeful configuration im not receiving anything. The part ive highlighted in black is where I recon im going wrong.

If the ISP has given me a /48 prefix of 2001:db8:55::, and I want to create a /64 subnet from that (2001:db8:55:10::/64), can someone explain the line highlight in bold please? /48 64? How would I change this to suit my configuration. Thanks guys.

[abdel_n · Accepted solution]

Hi Chris,

According to Cisco Doc the command defines a pool of IPv6 prefixes (network portion /48) to be assigned to users (/64)

So users will get 64-bit network portion addresses in the following form:

2001:db8:0055:XXXX/64

Important note:

IOS version prior to 12.4(24)T is not mature enough for stateful DHCPv6 deployment (for more inf.)

According to your configuration you are trying to perform a prefix delegation from an upstream DHCPv6 server to an intermediate DHCPv6 server then to clients as shown here:

Try the following configuration:

Upstream DHCPv6 Server:

ipv6 dhcp pool 
prefix-delegation  
dns-server 
domain-name 

On interface facing the intermediate DHCPv6 server

interface 
 ipv6 address /64
 ipv6 nd other-config-flag
 ipv6 dhcp server  rapid-commit | normal-commit

Normal-commit mode is generally used when you have multiple DHCPv6 servers in your network.

Intermediate DHCPv6 Server:

On interface facing upstream DHCPv6 server

interface 
 ipv6 address /64
 ipv6 enable
 ipv6 dhcp client pd  rapid-commit

On Interface facing final clients

interface 
 ipv6 address  ::2/64
 ipv6 enable

I hope this helps.

[stillspringwater]

Very helpful and imformative answer. Thank you very much.