NBG-418N v2 slows down permanently

Romper

Hello, i have problem with your router NBG-418N v2. It has V1.00(AARP.9)C0 firmware. The problem is that router has constantly lowered speed (cable, wifi). Full speed is 40Mbit, but after week or so speed is lovered to 5-9Mbit. Only solution for that is router restart. Can you help me with this please?

suisei

Seen you are not on the latest firmware.

Maybe try with the latest firmware may help

https://www.zyxel.com/uk/en-gb/support/download?model=nbg-418n-v2

Romper

thank you, but it doesnt help

tonygibbs16

Hi @Romper

If the slowdown is on both cable and wifi, then it could be the router or it could be the WAN connection.

Can you say what the Packet Statistics are when the slowdown happens, see below example?

When the router is reset, then it would also make the WAN connection be set-up again. So the issue could be router or WAN.

If newer firmware doesn't help, then maybe it could be a WAN issue…but the Packet Statistics at the time when it slows down could help rule a WAN issue in or out.

Could you also please share what encapsulation is used on the WAN?
- Is it PPTP, PPPoE, or Dynamic IP or Static IP or something else?

Thoughts?

Kind regards,

Tony

Romper

Hi

WAN is set to DHCP

This is packet statistic while slowdown.

tonygibbs16

Thanks @Romper

Are you running .14 firmware now?

If you are, then the release note says that there is a known issue that will restrict WAN throughput to 15Mbps if PPTP is used, see below.

from https://download.zyxel.com/NBG-418N_v2/firmware/NBG-418N%20v2_V1.00(AARP.14)C0_2.pdf

Thoughts?

Kind regards,

Tony

Romper

thank you for helping me

as i wrote i use Ethernet(DHCP) connection type

yes, iam running on V1.00(AARP.14)C0 firmware

suisei

Try replacing the Ethernet cable with a different one; it might resolve the issue :)
if the same, check if also limited to the client's connection to the internet or if it also affects communication between clients, if the issue also happen between clients, then maybe would related to hardware I think.

tonygibbs16

I do not agree with @suisei because there are no errors or drops shown in the packet statistics that @Romper posted.

- so I don't think that changing the Ethernet WAN cable will help.

Have you talked with your ISP @Romper about the slowdown you see?

- It might be that the slowdown is in their network…

Also, what speed is the Ethernet WAN link running at?

- It seems like the WAN can be 10 Mbits/s or 100 Mbits/s according to the user guide at https://prodotti.zyxel.it/USERSGUIDE/ZYXNBG-418NV2.pdf and https://download.zyxel.com/NBG-418N_v2/user_guide/NBG-418N%20v2_v1_ed4.pdf

- maybe the NBG is changing down to 10Mbits/s for some reason…which could explain a slowdown.

- Your ISP might be able to see if this is the case or not.

- if you had an Ethernet switch available that would indicate whether the Ethernet WAN was 100Mbits/s or 10Mbits/s speed if you put the switch between the NBG and your ISP, then that could help with fault diagnosis…

I hope that this is helpful.

Kind regards,

Tony

Romper

This is not a ISP problem because restarting router solve issue.

Romper

It seems i solved it

Both server were set up as a dhcp server and because of that the conflicts was appearing