Packet Tracer DHCPv6

[OneZ12345]

Hi i need help, basically I configure DHCPv6 on my layer 3 switch. But it seems to have issue . I have attached my packet tracer below, Hope someone can help me troubleshoot the issue.

[Harold Ritter]

Hi @OneZ12345 ,

The packet tracer file has not been uploaded. You need to first zip it and upload the zip file.

Regards,

[OneZ12345]

Hi, apologies. 

[Harold Ritter]

Hi @OneZ12345 ,

Two things.

1. For dhcpv6 to work properly, you need to configure the following commands on all the interfaces serving dhcpv6 clients.

ipv6 nd other-config-flag

ipv6 nd managed-config-flag 

2. I believe dhcpv6 is not yet supported on vlan interfaces in packet tracer. It is if you configure sub interfaces, but for that you need a router rather than a L3 switch. The configuration would look something like this:

interface GigabitEthernet0/0/0.10
Encap dot1q 10
ip address 172.16.10.1 255.255.255.0
ip helper-address 172.16.0.1
ipv6 address 2001:DB8:10::1/64
ipv6 nd other-config-flag
ipv6 nd managed-config-flag
ipv6 dhcp server VLAN10-DHCPv6
!
interface GigabitEthernet0/0/0.20
Encap dot1q 20
ip address 172.16.20.1 255.255.255.0
ip helper-address 172.16.0.1
ipv6 address 2001:DB8:20::1/64
ipv6 nd other-config-flag
ipv6 nd managed-config-flag
ipv6 dhcp server VLAN20-DHCPv6
!
interface GigabitEthernet0/0/0.30
Encap dot1q 30
ip address 172.16.30.1 255.255.255.0
ip helper-address 172.16.0.1
ipv6 address 2001:DB8:30::1/64
ipv6 nd other-config-flag
ipv6 nd managed-config-flag
ipv6 dhcp server VLAN30-DHCPv6
!
interface GigabitEthernet0/0/0.40
Encapsu dot1q 40
ip address 172.16.40.1 255.255.255.0
ip helper-address 172.16.0.1
ipv6 address 2001:DB8:40::1/64
ipv6 nd other-config-flag
ipv6 nd managed-config-flag
ipv6 dhcp server VLAN40-DHCPv6
!
interface GigabitEthernet0/0/0.50
Encapsu dot1q 50
ip address 172.16.50.1 255.255.255.0
ip helper-address 172.16.0.1
ipv6 address 2001:DB8:50::1/64
ipv6 nd other-config-flag
ipv6 nd managed-config-flag
ipv6 dhcp server VLAN50-DHCPv6
!
interface GigabitEthernet0/0/0.60
Encapsu dot1q 60
ip address 172.16.60.1 255.255.255.0
ip helper-address 172.16.0.1
ipv6 address 2001:DB8:60::1/64
ipv6 nd other-config-flag
ipv6 nd managed-config-flag
ipv6 dhcp server VLAN60-DHCPv6
!

This would work for sure.

Regards,

[OneZ12345]

Understood, so which is more recommended? Should I add a new router in between the layer 3 switch and isp switch and config or configure this into the ISP router itself? 

[Harold Ritter]

Hi @OneZ12345 ,

You could definitely add a router between the L3 switch and the PCs. This might not reflect what you would do in a real life scenario, but that will be good enough for you to test the dhcpv6 functionality on Packet Tracer.

Regards, 

[OneZ12345]

Hi i tried but it didnt work. I already submitted it anyways without including ipv6 . Thank you so much for your time and i apologise for the late reply as i was so busy configuring the others .

[Harold Ritter · Accepted solution]

Hi @OneZ12345 ,

Sorry to hear you could not submit your assignment with the ipv6 part. The reason it didn't work for you could be related to the fact you needed to reboot the PCs or at least do a "ipconfig /renew" to get the new address after you configured the DHCPv6 server.

In any case, I just created a simplified version with just a router, a switch and the PCs, in case you want to try it. I am attaching the .pkt as a zip file.

Let me know if you have questions.

Regards,

[syaifulnizamshamsudin]

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