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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).

Notes:

  • 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.


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”).

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.

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.

Variant 2: The provider delegates a dynamic IPv6 prefix (not recommended)

  • 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).

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.

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