[GH-ISSUE #2483] [4.8.14.5] Setting a custom netmask for "VPN address subnet" breaks the server #1113

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opened 2026-10-13 20:34:36 +00:00 by bsakaguchi · 1 comment

bsakaguchi commented

2026-10-13 20:34:36 +00:00

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Originally created by @nucfisher on GitHub (Apr 15, 2026).
Original GitHub issue: https://github.com/amnezia-vpn/amnezia-client/issues/2483

Describe the bug
AmneziaVPN 4.8.14.5 does't allow to set a custom netmask for VPN subnet.

To Reproduce
Steps to reproduce the behavior:

Go to 'Server settings-->AmneziaWG-->AmneziaWG server settings'
Click on 'VPN address subnet'
Set custom subnet e.g. "10.188.199.0/24"
Save settings
Create user account and import it to the AmneziaWG client (App version: 2.0.0)
Open tunnel properties in AmneziaWG, see "Addresses: 0.0.0.5/32".
Try "Activate" and see the error.

Expected behavior
Possible options:

Allow setting custom network subnet.
Validate the "VPN address subnet" value before applying and show the hint of the proper value format.

Desktop

OS: Windows 10
Version 10.0.19045 (amd64)

Smartphone

Device: Honor 10i
OS: Android 12
Version 12.0.0.221

Server

OS: Debian 13

Originally created by @nucfisher on GitHub (Apr 15, 2026). Original GitHub issue: https://github.com/amnezia-vpn/amnezia-client/issues/2483 **Describe the bug** AmneziaVPN 4.8.14.5 does't allow to set a custom netmask for VPN subnet. **To Reproduce** Steps to reproduce the behavior: 1. Go to 'Server settings-->AmneziaWG-->AmneziaWG server settings' 2. Click on 'VPN address subnet' 3. Set custom subnet e.g. "10.188.199.0/24" 4. Save settings 5. Create user account and import it to the AmneziaWG client (App version: 2.0.0) 6. Open tunnel properties in AmneziaWG, see "Addresses: 0.0.0.5/32". 7. Try "Activate" and see the error. **Expected behavior** Possible options: 1. Allow setting custom network subnet. 2. Validate the "VPN address subnet" value before applying and show the hint of the proper value format. **Desktop** - OS: Windows 10 - Version 10.0.19045 (amd64) **Smartphone** - Device: Honor 10i - OS: Android 12 - Version 12.0.0.221 **Server** - OS: Debian 13 <img width="376" height="672" alt="Image" src="https://github.com/user-attachments/assets/778552dd-0428-42af-82e1-64e49e3b9e86" />

bsakaguchi commented

2026-10-13 20:34:37 +00:00

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@hbethann commented on GitHub (Apr 18, 2026):

I found a similar issue on a device running the Ubuntu 24.04.4 LTS x64 operating system.

In Amnezia VPN version 4.8.14.5, when applying the client configuration in the application under “Server1” → Protocols → AmneziaWG → Show connection options, it shows that the field Address = 10.8.0.3/24 is being applied.

However, the output of ip addr show amn0 shows: “inet 10.8.0.0/32 scope global amn0”.

@hbethann commented on GitHub (Apr 18, 2026): I found a similar issue on a device running the Ubuntu 24.04.4 LTS x64 operating system. In Amnezia VPN version 4.8.14.5, when applying the client configuration in the application under “Server1” → Protocols → AmneziaWG → Show connection options, it shows that the field Address = 10.8.0.3/24 is being applied. <img width="707" height="345" alt="Image" src="https://github.com/user-attachments/assets/14aebd10-6639-4873-87b1-2c4a8855ca5d" /> However, the output of `ip addr show amn0` shows: “inet 10.8.0.0/32 scope global amn0”. <img width="268" height="160" alt="Image" src="https://github.com/user-attachments/assets/070faf57-86dd-45b6-a1dd-ea98260b3cd3" />

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amnezia-vpn/amnezia-client#1113

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