The IPv6 menu contains setttings for configuring basic IPv6 functionality on FreshTomato.

IPv6 has a number of services, or modes of operation which it can use. Some partly depend on IPv4 services, and others are run entirely independent of IPv4. Please ask your Internet Provider or search the Web to learn which IPv6 service type is used on your your ISP's network.

Note about MultiWAN setups:

FreshTomato does not currently support IPv6 in MultiWAN configurations. Only the first WAN interface can/will use IPv6.

This is the Default state. IPv6 is disabled by default. (IPv6 traffic will still flow/work if in access point mode, for example.)

This configuration method is one of the most commonly used. It provides native IPv6 connectivity for your network. It allows the ability to assign different IPv6 address ranges for bridge 0 (br0) to 3 (br3) if you're given a prefix with length smaller than 64 (for example 60 or 56) from your Internet provider. The option to assign IPv6 address ranges for bridge 1 (br1) to 3 (br3) is only visible if the bridges already exist. Check your configuration in the Basic/Network menu to learn more.

Configuration example for German Telekom ISP

Europe's biggest telecommunications company supports a dual-stack setup (IPv4 & IPv6). By default, German Telekom provides a prefix length of 56 for regular consumers. A prefix length of 64 (the default configuration for FreshTomato) will also work, but eliminates the possibility of assigning different IPv6 address ranges for bridge 1 (br1) to 3 (br3).

Extended options are available for IPv6 DHCPv6 PD - if bridges 1 (br1) to 3 (br3) exist AND if the prefix length is smaller than 64 (for example 60 or 56)

This mode is similar to the Static IP mode in IPv4. The IP adddess and other info. are set within FreshTomato's configuration menu. As long as they are consistent with the rules of your Internet provider, they should function fine.

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Every DHCP client and server does have a DUID (DHCP Unique Identifier). The DHCP server uses the DUID to identify the clients for the selection of configuration parameters.

Options:

• DUID-LL (default)
• DUID-LLT

DUID-LL will use the LAN (eth0) MAC address and will not change (static always) over time. DUID-LLT will in addition include time value, and will change on every reboot or reconnect of the WAN interface. You can see the currently used DUID at the GUI Status Overview.

Support for this option is available starting with release 2022.4

Note: DUID-EN or DUID-UUID or a custom DUID are currently not supported.

The network prefix contains the most significant bits of the address. The leading bits of addresses are identical for all hosts in your assigned network.

(Default: 64 bits). This can be changed to, for example, 56 bits.

This function should be enabled for ISPs that require only a Prefix Delegation (usually PPPoE-authenticated xDSL or fiber connections).

IPv6 Router Advertisements (via the WAN interface, through IPv6 ICMP) will add the default route, so this option should not be enabled/required. However, some ISPs, such as Snap (NZ), or Internode (AU) may require that you specify the default route / workaround..

see also https://www.linksysinfo.org/index.php?threads/ipv6-and-comcast.38006/

Tomato users can add or specify DNS server addresses. For example, If you are using DHCPv6 with PD on the ISP German Telekom, DHCP will automatically provide two IPv6 DNS server addresses. However, you can still manually add static DNS addresses if you wish.

Examples:

• 2001:4860:4860::8888 (Google public IPv6 DNS Server)
• 2001:4860:4860::8844 (Google public IPv6 DNS Server)

This function will cause Tomato to accept IPv6 Router Advertisements.

Options:

• WAN - Tomato will accept IPv6 Router Advertisements on the WAN interface.
• LAN - Tomato will accept IPv6 Router Advertisements on the LAN interface.

Note: When using DHCPv6 with Prefix Delegation, this option will always be enabled for the WAN interface. It cannot be disabled, since it is a necessity for this mode.