ISP & Network Engineering • AS5400 • Verified 2026

How to Stop Proximus Fiber Ultra Belgium Speed Throttling & DPI Traffic Shaping

Experiencing slowdowns or connection drops on Proximus Fiber Ultra Belgium (AS5400 • FTTH PPPoE VLAN 10) during 19:00–23:00 CET? Deep Packet Inspection (DPI), SNI classification, and congested transit peering cause dramatic throughput drops between 19:00 and 23:00 despite high headline speeds. SWEEPR VPN encapsulates all traffic inside a ChaCha20-Poly1305 encrypted WireGuard UDP stream to 10Gbps RAM-only London, Amsterdam, Frankfurt, and Stockholm core nodes, blinding ISP DPI classifiers and routing around congested peering links.

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Unprotected Proximus Fiber Ultra Belgium

18–34 Mbps (Evening Throttled)

With SWEEPR 10Gbps WireGuard

910+ Mbps (10Gbps WireGuard)

Recommended WireGuard MTU

1412 Bytes (4ms UK-LON-01 / 8ms NL-AMS-01)

Why Proximus Fiber Ultra Belgium (AS5400) Suffers From Speed Throttling & DPI Traffic Shaping

On Proximus Fiber Ultra Belgium (FTTH PPPoE VLAN 10), residential and mobile gateways frequently encounter PPPoE encapsulation overhead and Brussels BNIX transit queues between 19:00–23:00 CET. Standard unencrypted TCP/UDP flows expose plaintext Server Name Indication (SNI) headers, destination ASNs, and packet timing signatures that automated network queues classify and deprioritize.

Furthermore, using a default 1500-byte or uncalibrated VPN tunnel on Proximus Fiber Ultra Belgium triggers IP packet fragmentation unless your WireGuard interface is pinned to MTU = 1412.

How SWEEPR VPN Solves This on Proximus Fiber Ultra Belgium

Direct 10Gbps LINX & AMS-IX Peering: Instead of traversing congested retail transit links on AS5400, SWEEPR VPN routes your encrypted UDP stream directly to our 10Gbps RAM-only bare-metal nodes in UK-LON-01 (4ms), NL-AMS-01 (8ms), DE-FRA-01 (11ms), and SE-STO-01 (14ms).
Auto-Calibrated 1412 Byte MTU: SWEEPR VPN automatically detects FTTH PPPoE VLAN 10 path overhead and clamps your WireGuard tunnel to MTU = 1412 with PersistentKeepalive = 25.
In-Tunnel Zero-Log DNS (10.66.0.1): Bypasses Proximus Fiber Ultra Belgium transparent DNS proxies and NXDOMAIN interception completely.
Free 30-Second Home Wi-Fi Device Scanner: Instantly audits every phone, laptop, IoT plug, and Smart TV connected to your Proximus Fiber Ultra Belgium router subnet.

Recommended WireGuard Profile for Proximus Fiber Ultra Belgium (AS5400)

[Interface]
# SWEEPR VPN 10Gbps RAM-Only Profile optimized for Proximus Fiber Ultra Belgium (FTTH PPPoE VLAN 10)
PrivateKey = <GENERATED_ON_DEVICE_NEVER_LEAVES_RAM>
Address = 10.66.18.42/32
DNS = 10.66.0.1
MTU = 1412

[Peer]
# UK-LON-01 (London Docklands 10Gbps • 4ms Direct Peering)
PublicKey = 9xK2vP8mQ4nL7wR1tY5uI8oP3aS6dF9gH2jK5lZ8xC0=
Endpoint = lon01.sweeprvpn.com:51820
AllowedIPs = 0.0.0.0/0, ::/0
PersistentKeepalive = 25

Transparent Anchor Pricing & 30-Day Money-Back Guarantee

Unlike legacy VPNs that trap you in 24-month renewals or 250 MB bloated installers, SWEEPR VPN offers straightforward pricing with an instant free 30-second Home Wi-Fi Device Scanner:

Plan Tier	Billing Cycle	Effective Monthly Cost	Included Features
Yearly Plan (Core Cash Cow — Save 50%)	£74.99 / year ($95.99 USD \| €89.99 EUR)	£6.25 / mo	10Gbps RAM-Only WireGuard (UK, NL, DE, SE, CH, US), 10 Devices, Kernel Kill-Switch, 30-Day Guarantee
6-Monthly Plan (Mid-Tier Anchor — Save 35%)	£48.99 / 6 months ($61.99 USD \| €58.99 EUR)	£8.17 / mo	All 10Gbps WireGuard Core Locations, In-Tunnel DNS, Port-Forwarding & Streaming Support
Monthly Plan (Flexible + £1.99 1st Month)	£1.99 1st Month, then £12.49 / mo	£12.49 / mo	Cancel anytime in 1 click, full 10Gbps WireGuard & Wi-Fi diagnostic access
SWEEPR Wi-Fi Radar & Smart-TV Shield Add-On	+£14.99/yr \| +£9.99/6mo \| +£1.99/mo	Optional Add-On	24/7 Unknown Wi-Fi Intruder Alerts + Samsung/LG/Sony/Roku/Fire TV ACR Spy Blocker

Frequently Asked Questions

What is the best WireGuard MTU setting for Proximus Fiber Ultra Belgium?

For Proximus Fiber Ultra Belgium (FTTH PPPoE VLAN 10), setting your WireGuard interface to MTU 1412 prevents IP packet fragmentation and PMTUD blackholes while maximizing 10Gbps throughput.

Does SWEEPR VPN work with Proximus Fiber Ultra Belgium routers and Wi-Fi mesh systems?

Yes. You can run the ~3.7 MB SWEEPR VPN native app on Windows 10/11, macOS, Linux, iOS, and Android, or export a standard WireGuard .conf file for OpenWrt, GL.iNet, Asuswrt-Merlin, MikroTik, and UniFi gateways connected to Proximus Fiber Ultra Belgium.

Is the 30-second Home Wi-Fi Scanner really free on Proximus Fiber Ultra Belgium?

Yes. Downloading SWEEPR VPN includes our instant 30-second LAN ARP/mDNS device scanner at zero cost (no credit card required), showing every device and Smart TV on your Proximus Fiber Ultra Belgium Wi-Fi.