Q-in-Q support for PPPoE servers

As of LCOS 10.94, the PPPoE server now supports Q-in-Q VLANs, i.e. double-tagged VLANs. For incoming PPPoE packets, the corresponding peers are automatically created in LCOS.

In LANconfig, you can find the new parameters under Communication > General.

VLAN ID range

The PPPoE server supports Q-in-Q VLANs, i.e. double-tagged VLANs. For incoming PPPoE packets, LCOS automatically creates the corresponding peers in LCOS. A range for permitted VLANs can be specified here. A string of up to 64 characters consisting of the digits 0 to 9 and the character '-' for a range, as well as ',' for a list, can be specified. The list is validated on input. A maximum tag of 4095 may be entered. Tag 0 means "untagged". With the default "0-4095", all tags are permitted. Possible entries are individual values, ranges, as well as lists of values and ranges, e.g. "0,1,20-60,70,100-200,4095". For ranges, the second value must always be greater than (or equal to) the first value, i.e. "123-123" is valid, whereas "123-122" is not. If a packet is received with a tag that is not permitted, the PPP trace outputs this accordingly, e.g.

[PPP] 2025/03/19 18:19:16,051
          
Received PADI frame from peer b2:8d:ef:36:03:fd for session 0000 on LAN-1
 (VLAN-ID 8 not allowed) => Discard

Default: 0-4095

S-VLAN ID range

The PPPoE server supports Q-in-Q VLANs, i.e. double-tagged VLANs. For incoming PPPoE packets, LCOS automatically creates the corresponding peers in LCOS. A range for permitted S-VLANs can be specified here. A string of up to 64 characters consisting of the digits 0 to 9 and the character '-' for a range, as well as ',' for a list, can be specified. The list is validated on input. A maximum tag of 4095 may be entered. Tag 0 means "untagged". With the default "0-4095", all tags are permitted. Possible entries are individual values, ranges, as well as lists of values and ranges, e.g. "0,1,20-60,70,100-200,4095". For ranges, the second value must always be greater than (or equal to) the first value, i.e. "123-123" is valid, whereas "123-122" is not. Default: 0-4095