FreshTomato supports Virtual LAN (VLAN) configurations that conform to the 802.1Q standard. The user can create up to 16 VLANs. A VLAN can use a VID between 1 and 4094.

For VLANs to work properly on ARM and MIPS routers, please use FreshTomato 2021.8 and later . (See examples.)

• VLAN - the VLAN's unique identifier. (VLAN 0 to VLAN 15)
• VID - allows overriding “traditional” VLAN / VID mapping (Such as: VLAN 4 to VID 4)
  with arbitrary VIDs for each VLAN (use “0” to use “regular” VLAN/VID mappings instead).
• Ports 1 - 4 and WAN - specify which Ethernet ports will be members of this VLAN.
• Tagged - enable 802.1Q tagging of Ethernet frames on a particular port/VLAN.
• Default - the VLAN ID assigned to untagged frames that the router receives.
• Bridge - determines if this VLAN ID should be treated as WAN, part of a LAN bridge
  or just left as is (a member of an 802.1Q trunk, being managed manually via scripts).

This section contains the assignments of wireless interfaces to various LAN bridges.

It is recommended that you determine/verify the correct settings on the Virtual Wireless and Network menus to ensure proper VLAN operation.

The following settings are also mandatory:

• One VID must be assigned to the WAN interface.
• One VID must be selected as the default.
• Avoid using VID: “0” to prevent 802.1Q compatibility issues.
  802.1Q specifies that frames tagged with “0” don't belong to any VLAN.
  (This tag contains only user priority details). Wikipedia: 802.11Q
• Avoid using VID: “1” . Some vendors label it as “special” or “reserved” for management.

Configuration example for German Telekom ISP

Europe's biggest telecom company supports a dual-stack setup (IPv4 & IPv6). For the WAN Port a VLAN tag is required with a value of 7 (VID 7).

As described above, for VLANs to function properly, please use FreshTomato 2021.8 or later.
Older versions, (such as Shibby/Toastman/AdvancedTomato) may not work as expected (see following examples).

PPPoE connections work only when the following workaround is implemented:

Example 1: You are using FreshTomato 2021.7 to connect to German Telekom ISP.
German Telekom uses PPPoE with VID: “7”.
⇒ you must use VLAN: “7” using VID: “7” (a “traditional” VLAN/VID mapping).

Example 2: You are using FreshTomato 2021.7 to connect to Freedom Internet.
Freedom uses PPPoE , and VLAN: “6” using VID: “6”
See: https://www.linksysinfo.org/index.php?threads/fork-freshtomato-arm-development-discussion-only-for-support-always-open-your-own-thread.74117/page-245#post-330148

Example 3: You are using FT 2021.7 to connect to Vivo FTTH (Brazil).
(Vivo use PPPoE, and VLAN: “10” using VID: “10”)
see https://www.linksysinfo.org/index.php?threads/fresh-tomato-r7000-vlan-issue-on-ftth-provider.76958/#post-330955

Starting with release 2021.8, you can select or use any VLAN 0 to 15 (see picture above for example 1 (Telekom ISP), now using VLAN 5 with VID 7)