DHCP-Server IPv6

Setting up a DHCPv6 address pool

Last adaptation to the version: 14.0.3

New:

Set a extc-Variables with more than 1000 required leases

Adjustment in IP address allocation when Rejecting Unknown Clients is used.
Detailed logging in the DHCP settings

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This article refers to a Resellerpreview

12.6 12.5 12.4 11.7

DHCPv6

Network configuration UTMuser@firewall.name.fqdnNetwork 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.

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New as of v14.0.3

If more than 1000 IP addresses (across all pools together) are required via DHCP, the number of possible leases must be increased.

This is done in the menu Extras Advanced Settings Area Extc Variables with the variable MAXLEASES.

The value 0 corresponds to the default value of the service: 1000 leases.

If more leases are required, the actual value must be entered here. Edit

Define IPv6 address on interface

Edit Ethernet interface UTMuser@firewall.name.fqdnNetworkNetwork configuration Schnittstelle IP-Adresse hinzufügen 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 v12.6 DHCP Server IPv6 Pool einrichten Schritt 1-en.png

The DHCPv6 address pool for this subnet is set up under Area DHCP pools Button Add pool.
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, the pool start and end addresses are addresses from the previously defined subnet.

UTM v12.6 DHCP Server IPv6 Pool einrichten Schritt 2-en.png

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

UTM v12.6 DHCP Server IPv6 Pool einrichten Schritt 3-en.png

In step 3, Router Advertisement On must be enabled.

Finish the setup with the button Finish

Edit pool

Once the pool has been created correctly, it can be edited with .

General				Edit pool UTMuser@firewall.name.fqdnNetworkNetwork configuration Edit pool - general
Changes to the pool range start and pool range end possible

Options - DHCP Optionen
Option	Option number	Value	Description
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 Nameserver:	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	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:			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 Yes, an IP address is only assigned if there is a entry at Static DHCP tab for the MAC address of the client. notempty Changed standard behaviour ab v12.7: The static lease entry for the DHCP must be in the same pool to be considered known. The static lease entry for the DHCP must be in the same pool to be considered known.

DHCP Setup

The Setup button opens a dialogue for the DHCP settings.

Caption	Value	Description	Options UTMuser@firewall.name.fqdnNetworkNetwork configuration Options
Ignore other SDHCP-Servers	Off	When activated, other DHCP servers (IPv4 and IPv6) notempty New: are ignored.
Enable detailed logging: notempty New	Off	Enable detailed logging

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 Configuration Area Static DHCP Button Add Lease

Host:	Hostname	Meaningful host name	Add lease UTMuser@firewall.name.fqdnNetworkNetwork configuration 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
		Saves and takes over the lease

notempty Important: Leases must necessarily be in an existing DHCP pool!			Network configuration UTMuser@firewall.name.fqdnNetwork 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

UTM v12.6 DHCP Server IPv6 DHCP Warnung-en.png

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.