DHCP-Server IPv6

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Setting up a DHCPv6 address pool

Last adaptation to the version: 12.5.0

New:

Updated Edit Pool section with Settings
New option in the Pool Settings: Next Server
Better description for option Reject unknown clients
Updated section Static DHCP
Information on the associated Widget in Admin Interface (v12.4)

Last updated:

11.2023

notempty

This article refers to a Resellerpreview

12.4 11.7

DHCPv6

Configured DHCPv6 pool

The DHCPv6 address pool setup is only slightly different from the DHCP setup with IPv4.

Basic knowledge of IPv6 can be found here.

Define IPv6 address on interface

UTM v12 Netzwerkschnittstelle bearbeiten IP-Adressen-en.png

First, an IPv6 address with subnet and the corresponding zones must be entered on the interface on which IPv6 is to be "spoken". This IP determines the range in which the DHCP pool is located:
Configuration at menu → Network →Network Configuration / edit Interfaces / Tab IP Addresses
An IP address can be entered directly in the click box, in this example » ✕2001:DB8::1/64

Setting up the DHCP Pool

UTM v12 Netzwerkschnittstelle DHCP-Pool IPv6 Schritt1-en.png

The DHCPv6 address pool for this subnet is set up in the menu tab DHCP Pools.
The button Add Pool starts the wizard.
In step 1 a unique name for the pool, as well as the start and end address must be specified.
The name is freely selectable, pool start and end address are addresses from the previously defined subnet.

UTM v12 Netzwerkschnittstelle DHCP-Pool IPv6 Schritt2 Nameserver-en.png

In step 2, enter the IPv6 address of the name server. In this example the UTM: 2001:DB8::1

UTM v12 Netzwerkschnittstelle DHCP-Pool IPv6 Schritt3 Router-Advertisement-en.png

In step 3, Router Advertisement On must be enabled.

Finish the setup with the button Finish

Edit pool

After the pool has been created correctly, the pool start and end address can be changed and other parameters of the DHCP pool can be set up to be passed to the DHCP client.

Tab General

General

UTM v12.5 Netzwerk Netzwerkkonfiguration DHCP Pool bearbeiten Allgemein IPv6-en.png

Changes to the pool range start and pool range end possible

Tab Options

Options - DHCP Option

Option	Option number	Example parameters	Comments
Router:	3	» ✕2001:db8::1	Router as configured in Define IPv6 address on interface.
Domain name:	15	securepoint.local	Name of the domain in which the DHCP leases are assigned
Domain name server:	5	» ✕2001:db8::1	Name server as configured in step 2
Netbios name server:	44	» ✕	NetBIOS over TCP/IP Name Server Option
SMTP-Server:	69	» ✕	Simple Mail Transport Protocol (SMTP) Server Option
NTP Server:	41	» ✕	Servers should be listed in order of preference.
Vendor Encapsulated Options:	43		Values must be given coded.
TFTP Server Name:	66	i.e.: profile.gigaset.net	The IPv6 address, or hostname from the TFTP server option tftp-server-name text;
Bootfile Name:	67		The name of the bootfile file option bootfile-name text;
Default URL:	114	https://teamwork.gigaset.com/gigawiki/display/GPPPO/DHCP+option+114	Default URL option default-url string;
VLAN ID:	132		The ID of the VLAN used option vlan-id code 132 = text; option vlan-id "128";
Next Server:notempty New as of: v12.5			The IPv6 address of the Next server If the value is missing, TFTP may not work.
Default Lease Time:	51	600 Seconds	Default validity period of the IP address if the client has not requested an explicit duration.
Maximal Lease Time:		7200 Seconds	Maximum validity period of the IP address in seconds that the client may receive when explicitly requested.
Reject unknown clients:		No	If activated , an IP address is only assigned if there is a entry at Static DHCP tab for the MAC address of the client. A client is also considered as known if there is an entry with an IP address from any other pool Example: Pool 1: 10.10.10.10 - 10.10.10.20 (Net on LAN3) Pool 2: 10.20.20.20 - 10.20.20.30 (Net on LAN4) Both pools with option Reject unknown clients Static IP 10.10.10.15 (from pool 1) for MAC address 01:23:45:67:89:AB Client with MAC address 01:23:45:67:89:AB receives at LAN3 always: 10.10.10.15 Client with MAC address 01:23:45:67:89:AB receives at LAN4 e.g.: 10.20.20.21

DHCP Setup

The Setup button opens a dialogue for the DHCP settings.

Caption	Value	Description
Ignore other SDHCP-Servers (IPv4):	No	If Yes is enabled, other DHCP servers for IPv4 are ignored.
Ignore other SDHCP-Servers (IPv4):	No	If Yes is enabled, other DHCP servers for IPv6 are ignored.

Static DHCP

If hosts are to be assigned predefined IP addresses ( fixed IPs bound to the MAC address, but assigned by the UTM), these IPs can be reserved with static leases:
Configuration under → Network →Network ConfigurationTab Static DHCP Button Add Lease

Host:	Hostname	Meaningful host name	Dialogue Add lease
Ethernet:	00:00:00:00:00:00	MAC address of the host
IP:	2001:db8::a1/---	IP address to be reserved exclusively for this host
Save		Saves and takes over the lease

notempty Important: Leases must necessarily be in an existing DHCP pool!			Overview static DHCP leases
notempty Joint use of static and dynamic IP addresses within a pool is possible.

Static leases outside a pool

Existing static leases that are not within a DHCP pool must be changed!

If such leases are detected after an update, a message is displayed prompting to adjust the DHCP settings.
It ist now possible that either

the leases are adapted and relocated in existing pools
or
additional DHCP pools are created that contain static leases
or
existing DHCP pools are extended so that they include static leases

Warning at login

Widget

In the administrator interface of the UTM, there is a DHCP widget that provides an overview of the existing DHCP connections.
Further information can be found in the Wiki article UTM Widgets.