The three details your line decides
To set up a fibre connection by hand you need to know three things:
- Connection type: PPPoE or IPoE (dynamic IP). It decides whether you’re asked for a username and password.
- VLAN: which number tags the internet traffic. Without it nothing gets through.
- 802.1p priority: which quality mark it carries. Usually 0 or 1.
With those three details, any neutral router connects. The problem is that they don’t depend only on the ISP, but also on the specific product.
Table reviewed in September 2026. These are network settings, not secret data, but they change: if something doesn’t work, check with your ISP before carrying on. Once your line works, note the date here.
Table by ISP
How to read this table: the values for Movistar, Orange and Vodafone FTTH are stable. Those for Vodafone NEBA/Lowi, Digi, Adamo and other virtual operators change depending on the product and the area, and come from community sources: confirm them with your ISP before buying hardware or signing off the installation.
| ISP | Type | Internet VLAN | Priority | Phone VLAN | TV VLAN |
|---|---|---|---|---|---|
| Movistar and O2 | PPPoE | 6 | 1 | 3 | 2 |
| Orange | IPoE | 832 | 0 | 832 | 838 |
| Jazztel | IPoE | 832 | 0 | 832 | 838 |
| Vodafone FTTH | IPoE | 100 | 0 | 100 | 105 |
| Vodafone NEBA and Lowi | IPoE | 20 or 24 | 0 or 3 | 20 | 20 |
| Digi | PPPoE | 20 | 0 | depends on product | depends on product |
| Adamo | IPoE | 603 | 1 | 630 | depends on product |
| Virgin Telco | IPoE | 10 | 0 | 10 | 10 |
| Pepephone, Yoigo and Masmóvil | IPoE | 20 | 0 | 20 | 20 |
Two rows deserve immediate attention:
- Vodafone appears with two values because it isn’t a single network. Vodafone’s own FTTH uses VLAN 100, while Vodafone NEBA and Lowi, which buy fibre from Movistar, use 20 or 24. If you have Lowi, the NEBA row is yours.
- Digi allows your own router, with commercial exceptions. Community sources (Bandaancha) confirm the service is compatible with your own router, but not with the PRO-DIGI plan or with landline phone. Digi doesn’t publish this table in an accessible way, so treat it as guidance and confirm it with their customer service.
The Movistar case
Movistar is the simplest and the best documented. The PPPoE session uses:
- Username:
adslppp@telefonicanetpa - Password:
adslppp - VLAN: 6, priority 1 for internet
Although the names look inherited from ADSL, they still work. In practice, the password is accepted with any character: Telefónica’s server doesn’t validate it against anything.
With the HGU Smart WiFi in monopuesto, the pseudo-bridge delivers the VLAN already untagged. In that case you configure PPPoE and you don’t set the VLAN, because it comes separated already.
The Digi case
Digi uses PPPoE with VLAN 20. The credentials are customised per customer: you have to request them from customer service, which provides them over the phone if you call from the Digi network on 1200.
The exceptions matter more than the table:
- With PRO-DIGI they don’t give the PPPoE credentials.
- Not with landline phone contracted either.
- With VoIP, the Digi router also needs the SIP details, which aren’t provided.
If you find that Digi tells you it can’t, that’s not your mistake: it’s a commercial restriction of the product.
Configuration step by step
- Connect the WAN of your router to the ONT or to the ISP router in bridge mode.
- In the WAN connection section, choose PPPoE or IPoE according to the table.
- Tick the VLAN box and enter the exact number.
- Set the 802.1p priority to the indicated value.
- If it’s PPPoE, enter the username and password.
- Set the MTU to 1492 for PPPoE and 1500 for IPoE.
- Apply and wait. If the session doesn’t come up within 60 seconds, check the router logs.
In OpenWrt the equivalent configuration, following its PPPoE documentation, would look like this:
config interface 'wan'
option device 'eth0.6'
option proto 'pppoe'
option username 'adslppp@telefonicanetpa'
option password 'adslppp'eth0.6 is the interface with VLAN 6. For IPoE you change it to proto 'dhcp'.
Why sessions fail
| Symptom | Usual cause |
|---|---|
| No IP obtained | Wrong or unset VLAN |
| PPPoE session drops when validated | Wrong credentials |
| Phone browses but the laptop doesn’t | DNS not applied to all networks |
| It works fast for a while, then drops | Badly adjusted MTU |
| TV with no picture | Wrong TV VLAN or missing IGMP |
| Works with the ISP router but not with yours | Untagged traffic that your device tags again |
The last case deserves a caveat: if the ISP router delivers the traffic already untagged and your router puts the VLAN back, the connection breaks. Options: remove the VLAN tag, or put the ISP device into real bridge mode.
CGNAT: the other cause of silent failure
Even if you set everything up correctly, your line may be behind a CGNAT, and then you won’t have a public IP address. With IPv6 it may work and with IPv4 it won’t. It’s a separate topic that explains why you can’t open ports.
Quick checklist
- Correct connection type: PPPoE or IPoE.
- The exact VLAN and priority for your product, not just for your ISP.
- Credentials requested from customer service if it’s PPPoE.
- MTU set to 1492 or 1500.
- Router logs reviewed if the session doesn’t come up.
- TV and landline phone still on the ISP router.
- The table review date noted down.
Sources and next step
If you already have the data and want to see the full picture of the installation, continue with ONT, HGU and neutral router. For the context of why this is done, read the guide to replacing your ISP router. And if the problem isn’t the connection but the speed once you’re in, go to slow WiFi at home.
External sources
- OpenWrt: PPPoE as a WAN interface
- OpenWrt: 802.1Q VLAN on the switch
- Bandaancha: neutral router configuration on FTTH — community source.
- Bandaancha: replacing Digi’s ZTE H3600 with OpenWrt — community source.
- Bandaancha: neutral router on Vodafone — community source.
Guidebook table last reviewed on 2026-09-30.