@darius has a router with a switch chip between the CPU and the Ethernet ports. The tag of 2 is needed to get the packet through the switch chip. The switch removes the tag before the packet goes out on the wire, so the modem receives untagged packets.
An x86 box on the other hand almost always has a dedicated eth interface for each physical port, and no switching. Adding a VLAN tag to the eth port will cause tagged packets to go out to the modem.
Hi,
Doesn't work I'm afraid, any ideas ?
Anyway I'm going to speak with Vodafone IT department soon again. I won't give up easily 
Which Vodafone broadband service do you have?
Your earlier post suggests you have a GFast modem (Is it openreach model?), which will have a regular ethernet port for an external router. In which case, a PPPoE protocol with username & password are all that is required if it is the same as their regular Openreach upto 80 Mbps FTTC service. No VLAN or settings required as this is dealt with by the fibre modem.
If you have a Windows laptop, can I suggest to connect it to the ethernet port on the modem and see if you can get a connection by setting up a PPPoE connection.
This MS link may help
https://answers.microsoft.com/en-us/windows/forum/all/how-to-make-windows-10-to-auto-connect-to-pppoe-on/5184e13b-4e3d-4953-9205-96140405b86e
Double check the username and password are correct because I understand you have to contact Vodafone Customer Services for this information. (It is NOT the account username & password)
What model router are you using and version of OpenWrt ?
What is make & model no. of the wall mounted fibre modem ?
Is it an Openreach FTTC, GFast, FTTP, or CityFibre or other connection?
+1 for checking from PC first
Username/password are out of discussion yet, since the client simply cannot contact server
@bill888 I have 500Mbits https://www.vodafone.co.uk/broadband/deals/gigafast
As I said earlier, the small box has a proper fibre port and also ethernet one . The Fibre going from outside of the building and ethernet to router.
Definitely I'll test pppoe on windows, thanks for that idea
The 500 Mbps service is not an Openreach product. Your vodafone service is probably from CityFibre.
There is a reference to using VLAN 911 for CityFibre Gigafast in Milton Keynes when connecting 3rd party router to Calix fibre modem
https://forum.vodafone.co.uk/t5/Other-broadband-queries/3rd-party-router-on-Gigafast-in-Milton-Keynes/td-p/2614887
@bill888 you are the star works perfectly. Thanks a lot for your help
below config works,
config interface 'wan'
option proto 'pppoe'
option username 'xxxxxxxxxx2@broadband.vodafone.co.uk'
option password 'xxxxxxx'
option ipv6 '0'
option ifname 'eth1.911'
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