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Description:

This article describes how to configure the LANCOM-internal DHCPv6 server to assign IPV6 addresses (IN_NA) on the local network (e.g. INTRANET).

Requirements:

LCOS version 10.40 or later (download)
LANtools version 10.40 or later (download)
The LANCOM router must have a functional IPv6 Internet connection.
The Internet provider provides a static IPv6 prefix (recommended).

The use of address assignment via DHCPv6 is not recommended for dynamic IPv6 prefixes, because clients may not renew addresses obtained via DHCPv6 in the event of a prefix change. In this case, the clients still use the old prefix and communication via IPv6 is no longer possible until the address lease time has expired.
Android clients do not have an integrated DHCPv6 client and therefore do not support address assignment by DHCPv6. These clients can only obtain addresses via router advertisement/auto-configuration.

Scenario:

The LANCOM router receives the static IPv6 prefix 2001:db8:abcd::/56 from the Internet provider.
The first IPv6 subnet is "1". This should be used on the local network, so the IPv6 prefix used is 2001:db8:abcd:1::/64.

LANCOM Support Knowledge Base > Assigning IPv6 addresses via DHCPv6 server on the local network > pc_11.png

Procedure:

1) Open the configuration dialog for the LANCOM router and switch to the menu item IPv6 → Router-Advertisement.

2) Modify the entry for the local network INTRANET.

Enable the option Managed address configuration flag.
The option Other configuration flag can either remain enabled (default) or disabled.

When enabled, the option Managed address configuration flag instructs a client to request the DHCPv6 server for an IPv6 address (“Stateful Address Assignment”).

LANCOM Support Knowledge Base > Assigning IPv6 addresses via DHCPv6 server on the local network > pc_12.png

3) Switch to the menu IPv6 → Router Advertisement → Prefix list.

4) Modify the entry for the local network INTRANET.

Disable the option Allow auto-configuration (SLAAC). If this option is disabled, clients do not generate an address using auto-configuration and can only obtain an IPv6 address via DHCPv6. If this option is enabled, clients generate IPv6 addresses both via auto-configuration and via DHCPv6.

If you disable the Allow auto configuration (SLAAC) option, Android clients can no longer obtain an IPv6 address.

LANCOM Support Knowledge Base > Assigning IPv6 addresses via DHCPv6 server on the local network > ip_2.png

5) Switch to the menu IPv6 → DHCPv6 → Address pools.

6) Create a new entry (recommended variant):

Address pool name: Enter a name for the address pool.
First address: Set the first address in the DHCPv6 pool to 2001:db8:abcd:1:0:0:0:1.
Last address: Set the last address of the DHCPv6 pool to 2001:db8:abcd:1:0:0:0:F.

LANCOM Support Knowledge Base > Assigning IPv6 addresses via DHCPv6 server on the local network > ip_3.png

Address pool name: Enter a name for the address pool.
First address: In the case of a dynamic prefix, set the value “::1:0:0:0:1”. The prefix 2001:db8:abcd::/56 obtained from the provider is combined with the value “::1:0:0:0:1” and internally set to 2001:db8:abcd:1:0:0:0:1.
Last address: In the case of a dynamic prefix, set the value “::1:0:0:0:F”. The prefix 2001:db8:abcd::/56 obtained from the provider is combined with the value “::1:0:0:0:F” and internally set to 2001:db8:abcd:1:0:0:0:F.
Receive prefix from: Select the name of the Internet connection used to obtain the dynamic IPv6 prefix (e.g. INTERNET).

LANCOM Support Knowledge Base > Assigning IPv6 addresses via DHCPv6 server on the local network > ip_4.png

7) Switch to the menu IPv6 → DHCPv6 → DHCPv6 networks.

8) Modify the entry for the local network INTRANET.

Set the address pool as the pool created in step 6.

LANCOM Support Knowledge Base > Assigning IPv6 addresses via DHCPv6 server on the local network > ip_5.png

9) Write the configuration back to the LANCOM router. This concludes the configuration.