# IPv6 DHCPv6 Prefix Delegation

**URL:** https://forum.networklessons.com/t/ipv6-dhcpv6-prefix-delegation/2993
**Category:** Lessons Discussion
**Created:** [February 20, 2018, 11:59am UTC](https://forum.networklessons.com/t/ipv6-dhcpv6-prefix-delegation/2993 "2018-02-20T11:59:30Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![syncope988](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/syncope988/32/1385_2.png) [@syncope988](https://forum.networklessons.com/u/syncope988)
#### Post date: [March 11, 2020, 12:29am UTC](https://forum.networklessons.com/t/ipv6-dhcpv6-prefix-delegation/2993/6 "2020-03-11T00:29:47Z")

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Hi REne and staff,  
thanks for your work (it is not pretented)

i lab this lesson with  
 ![image](https://cdn-forum.networklessons.com/uploads/default/original/2X/7/7335742f2d5451e7b58476dedc8f9cf0a05ac174.png)

and i test some other prefix values for the global pool

When the global pool is /40 (like in the lesson) the delegation is between 40 and 56  
 ![Image12](https://cdn-forum.networklessons.com/uploads/default/optimized/2X/6/6a667fe33f1c8b8e10960d6355494027e44d51f7_2_690x63.jpeg)

when the global pool is /32 the delegation is between 32 and 48  
 ![image](https://cdn-forum.networklessons.com/uploads/default/original/2X/f/fa2e09ef11a8649c4df948a71cf6fa4d3a8be3bf.png)

it seems that the upper value is + 16  
And you cannot use a value greater than the upper value (when /32 the upper value is /48 and you cannot use /56 for example)

Is there a reason for that ?  
Regards

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