Internet Disconnects When Setting VLAN 10 on R3 (Vodafone Fiber ONT)

[Mohamed87]

I’m using Vodafone Fiber, and the ISP ONT requires VLAN 10.

However, when I configure VLAN 10 on my R3, the internet disconnects completely.

If I leave the VLAN field empty, the internet connects, but it randomly disconnects from time to time.

[Netduma Fraser]

You're saying the ONT requires VLAN 10, does that mean the ONT is actually set to use 10 for VLAN? If so then you do not need to input this into the R3 as well. 

How often are you disconnecting? When it happens again please grab the logs from Settings prior to rebooting and we can take a look.

[Mohamed87]

Before I created the new Router WAN profile, the internet used to disconnect around 4–5 times per day.

After setting up the new profile, it now only disconnects 1–2 times a day.

When it happens again, I’ll send you the logs before rebooting the router.

[Netduma Fraser]

You should delete the first profile and for the second then apply it to LAN1 as well and see if that fixes it. 

[Krush]

Ton FAI utilises PPPoE et Vlan ID pour contourner leur routeur !

As tu garder la configuration PPPoE sur le R3 ?

- Soit tu utilises le R3 derrière l'ONT avec les informations Vlan 10 et PPPoE (Plus de VOIP)

- Soit tu utilises ton routeur FAI derrière L'ONT et le R3 en DHCP

@Netduma Fraser  C'est le même cas de figue que Turk Telekom ...

 

----- Si tu nous donnes le nom de ton FAI et une photo de ta configuration (ONT-ROUTEUR-R3), je suis sûr que nous pouvons t'aider !😉----

[Mohamed87]

the first profile is 

The first profile is actually the bridge one.

Previously, I had deleted the router and VoIP profiles, and the WAN was disconnecting about 4–5 times a day.

After I restored those profiles and disabled the WAN on the router profile, it now disconnects only 1–2 times a day.

[Mohamed87]

Today was the first day my R3 didn’t restart  due to internet loss, which is great.

However, I had to restart it manually because the Netduma app on my phone stopped responding and showed “Try rebooting.”

When I tried to access the router interface via 192.168.77.1, it wouldn’t load either — the page just wouldn’t open at all.

Even after rebooting, I could access it through the app or the browser.

Eventually, I had to restart it again to get access back.

 

Could you please help me identify what might be causing this issue?

[Mohamed87]

The connection dropped again, and I have attached the diagnostic log captured at the time of the crash.

It seems that the WAN (PPPoE) interface keeps restarting repeatedly, as shown in the log, and the system reports repeated termination signals (SIGTERM) for the PPP session.

 

Please review the attached log and let me know if this indicates a firmware issue or a configuration conflict.

diagnostic-report-2025-10-23T00_50_41.115Z.json

[Mohamed87]

update it disconnected again and here this log

 

R3_2025-10-23T010555.467Z_logs.txt

[Netduma Fraser]

We are aware of some users getting disconnects with PPPoE, so go back to the default settings on your ISP modem/router and then just add the R3 WAN IP (found on the R3 in Settings > WAN or the IP shown on the ISP modem/router as a connected device) into the DMZ on the ISP modem/router. The ISP modem/router should then handle PPPoE/VLAN instead of the R3 and you shouldn't get any more disconnects when connected to the R3.

[Mohamed87]

completely understand the difference now, but I’ve already noticed that when the ISP modem/router handles PPPoE (with the R3 in DMZ), the connection is stable — yet many of the R3 features like Ping Optimizer, Geo-Filter, and Smart Boost don’t work as accurately as they do when the R3 itself handles PPPoE in bridge mode.

I actually tried that setup before — letting the ISP modem/router handle PPPoE and putting the R3 in the DMZ.However, when I used that configuration, my ping and latency were noticeably higher, and the overall gaming experience felt worse compared to when the ONT was connected directly and the R3 handled PPPoE in bridge mode.With the bridge setup, gameplay was smooth and ping was very low, but unfortunately, the only issue was the frequent disconnects.I’m also worried that the repeated reboots and disconnects might eventually harm the R3 hardware.Please, if possible, work on improving or fixing the bridge mode as soon as you can — it delivers the best performance by far.

 

[Netduma Fraser]

You would need to ensure ALL devices are connected to the R3 in that scenario, stop any devices auto connecting to the ISP modem/router. It's likely you would just need to fine tune your Congestion Control/SmartBOOST settings to get a better experience. We are working on the PPPoE issue.

[Mohamed87]

in this case to prevent double NAT 

shall i connect LAN TO LAN between ont and R3  or LAN to WAN

AND

shall i disable DHCP in R3 or not

[Netduma Fraser]

ONT LAN > R3 WAN, as long as the R3 is in its DMZ you're good for NAT. Do not disable DHCP on the R3

[Mohamed87]

Hello

I’m using a Netduma R3 router and I’ve noticed two recurring issues in my system logs, even though IPv6 is fully disabled on both the ONT and the router, and the time is correctly synchronized on both devices.

1. Every few minutes, I see this log entry repeating:
   daemon.err odhcp6c[xxxx]: Failed to send SOLICIT message to ff02::1:2 (Cannot assign requested address)

2. I also keep getting time-related warnings such as:
   [WARNING]: time went backwards
   or
   system time jumps detected in log

The router is currently running in bridge mode (ONT handles PPPoE) and i tried DMZ method also

 IPv6 is disabled on both sides. Despite that, these messages keep showing up every 4–5 minutes, and sometimes the internet briefly drops when they appear.

Could you please confirm:
- Why odhcp6c is still running even with IPv6 disabled?
- Whether there’s a firmware fix or hidden setting to fully stop the IPv6 client or the time sync conflict?

If possible, please enable SSH access temporarily on my device so I can collect diagnostic information for you.

if this error may cause the drop in internet

 

[Netduma Fraser]

35 minutes ago, Mohamed87 said:

Hello

I’m using a Netduma R3 router and I’ve noticed two recurring issues in my system logs, even though IPv6 is fully disabled on both the ONT and the router, and the time is correctly synchronized on both devices.

1. Every few minutes, I see this log entry repeating:
   daemon.err odhcp6c[xxxx]: Failed to send SOLICIT message to ff02::1:2 (Cannot assign requested address)

2. I also keep getting time-related warnings such as:
   [WARNING]: time went backwards
   or
   system time jumps detected in log

The router is currently running in bridge mode (ONT handles PPPoE) and i tried DMZ method also

 IPv6 is disabled on both sides. Despite that, these messages keep showing up every 4–5 minutes, and sometimes the internet briefly drops when they appear.

Could you please confirm:
- Why odhcp6c is still running even with IPv6 disabled?
- Whether there’s a firmware fix or hidden setting to fully stop the IPv6 client or the time sync conflict?

If possible, please enable SSH access temporarily on my device so I can collect diagnostic information for you.

if this error may cause the drop in internet

You can ignore both of these, they're just log spam, they won't be causing you any issues. It's very likely a lease renewal happening for a device when the connection briefly drops. We don't allow SSH access.