DHCPv6 Issue

[Deepak Kumar]

Hi Team,

I configured a DHCPv6 server on Cisco 2901 router (c2900-universalk9-mz.SPA.151-4.M3.bin) in my office lab and Windows 10 System is getting the IPv6 address but it is not pinging with DHCP Router. I am getting error  "PING: transmit failed. General failure." on windows 10 and RTO on Cisco Router.

Here, I am sharing the router Configuration:

no aaa new-model
!
ipv6 dhcp pool test
address prefix FD00:1234:5678:1::/64
dns-server FD00:1234:5678:1::1
domain-name lab.test
!

!

ipv6 unicast-routing

!

interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
ipv6 address FD00:1234:5678:1::1/64
ipv6 nd other-config-flag
ipv6 dhcp server test

!

!

----------

Windows 10 is getting IP:

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . : lab.test
IPv6 Address. . . . . . . . . . . : fd00:1234:5678:1:11f7:434d:3da7:888b
Link-local IPv6 Address . . . . . : fe80::2c03:948c:f82b:1305%21

Now I am sharing some testing output which is done from my side in attached document. As per my test Windows 10 is not replying or sending any packet to DHCP Router.

Please help me.

Thanks.

Deepak Kumar

[Georg Pauwen · Accepted solution]

Hello Deepak,

is this the full config ? Make sure you have:

ipv6 unicast-routing

configured globally.

[Deepak Kumar]

Hi,

Sorry, It has configured already. 

Regards,

Deepak Kumar

[Georg Pauwen · Accepted solution]

Hello Deepak,

my bad, it was in the original post already.

Either way, looking at your config, it seems that your pool is configured for stateful DHCP, while the interface is configured for stateless.

Try the following config:

ipv6 dhcp pool test
address prefix FD00:1234:5678:1::/64
dns-server FD00:1234:5678:1::1
domain-name lab.test
!
ipv6 unicast-routing
!
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
ipv6 address FD00:1234:5678:1::1/64
ipv6 nd managed-config-flag
ipv6 dhcp server test
ipv6 nd prefix FD00:1234:5678:1::/64 14400 14400 no-autoconfig

[Deepak Kumar]

Hi,

This is not working. When I am assigning the static IP then it is working fine but DHCP is not working.

Now I have one question -  why Windows is not going to add any route in the routing table?

Regards,

Deepak Kumar

[Deepak Kumar]

Hi 

I made a big mistake in configuration. I analysis all packets and found that Router is not sending the "Router Advertising" packet. So I checked the full configuration and found 

ipv6 multicast-routing

instead of 

ipv6 unicast-routing

Thanks all,

Deepak Kumar

[Ahsan Bashir]

Do you use -6 option in ping command ?