Why does my Xbox show Strict NAT on M-net?

M-net uses DS-Lite (Dual-Stack Lite) by default, sharing one public IPv4 address among multiple customers. This creates Strict NAT for consoles and some PC games. Book the 'IPv4 Option' (approximately 5 EUR/month) for a dedicated public IPv4 address and Open NAT.

Why am I only getting 100 Mbps on my 1 Gbps M-net plan?

This is almost always a CAT5 Ethernet cable (limited to 100 Mbps Fast Ethernet) or a device with a Fast Ethernet port. Replace with CAT5e or CAT6 cable and check that your PC network adapter is set to 1 Gbps Full Duplex in Device Manager.

M-net Speed Test — Bavaria's Own Fibre Provider

M-net is a regional fibre-optic ISP serving Bavaria — primarily Munich, Augsburg, Nuremberg, and Erlangen. Owned by Stadtwerke München (Munich's municipal utility company), M-net is one of Germany's few ISPs that actually owns its own fibre infrastructure rather than reselling Telekom's copper lines.

This matters because M-net's Glasfaser network delivers genuine FTTH and FTTB connections, bypassing the VDSL copper limitations that plague much of German broadband. If you live in Munich and M-net covers your building, you likely have access to better speeds and lower latency than Deutsche Telekom's VDSL can offer.

M-net Surf&Fon Plans

Plan	Download	Upload	Technology
Surf&Fon 100	100 Mbps	40 Mbps	FTTB/FTTH or VDSL
Surf&Fon 300	300 Mbps	60 Mbps	Glasfaser
Surf&Fon 600	600 Mbps	100 Mbps	Glasfaser
Surf&Fon 1000	1,000 Mbps	300 Mbps	Glasfaser (GPON)

M-net's upload speeds are notably generous compared to Telekom (40 Mbps max on VDSL) and Vodafone cable (50 Mbps max). The 1000/300 Mbps plan is particularly attractive for content creators, remote workers, and anyone uploading to cloud services regularly.

The DS-Lite Problem — Gaming and NAT

This is the most common frustration for M-net customers. M-net uses Dual-Stack Lite (DS-Lite) by default for IP address management. Under DS-Lite, you receive a public IPv6 address but share a public IPv4 address with other customers through a carrier-grade NAT tunnel.

What this means in practice:

Gaming: Xbox and PlayStation show "Strict NAT" or "NAT Typ 3", which prevents voice chat and matchmaking with some players.
VPN/NAS: You cannot access your home network from outside via IPv4 (no port forwarding possible).
Hosting: Running game servers, web servers, or any service requiring incoming IPv4 connections is impossible.

The fix: Book the "IPv4 Option" for approximately €4.90/month. This gives you a real, dedicated public IPv4 address alongside your IPv6 — full Dual-Stack. Call 0800 180 88 88 or add it via the M-net Kundencenter.

FRITZ!Box — M-net's Standard Router

M-net supplies AVM FRITZ!Box routers, pre-configured for their network. This is a significant advantage — the FRITZ!Box is widely regarded as the best residential router in Germany.

Feature	FRITZ!Box 7590 AX	FRITZ!Box 5530 Fiber
Connection	DSL/VDSL (copper)	Direct GPON fibre (SFP module)
Wi-Fi	Wi-Fi 6 (802.11ax)	Wi-Fi 6
Admin URL	fritz.box or 192.168.178.1
Password	Printed on bottom sticker (M-net pre-configured)
GF-TA needed?	Yes (connects via ONT modem)	No (direct SFP fibre)

Important: M-net pre-configures these routers. Do not factory reset unless absolutely necessary — you will lose the M-net configuration and need to call support for new PPPoE credentials.

FRITZ!Box LED Guide

Power/Fiber — Steady green: Fibre link synced. Everything is working.
Power/Fiber — Blinking green: Syncing with the network. Wait 2-3 minutes.
Power/Fiber — Red: Physical line lost. Check the fibre patch cable between FRITZ!Box and the GF-TA (Glasfaser-Teilnehmeranschluss) wall box.
Info — Red: Internet authentication failed (PPPoE error). Check if M-net has a regional outage or if the router config was accidentally changed.
WLAN — Off: Wi-Fi disabled via physical button or time schedule. Press the WLAN button to re-enable.

The 100 Mbps Cap — A Common Trap

If your speed test shows exactly 90-95 Mbps on a 300, 600, or 1000 Mbps plan, you have a hardware bottleneck. The cause is almost always:

Old CAT5 Ethernet cable — limited to 100 Mbps (Fast Ethernet). Replace with CAT5e or CAT6.
FRITZ!Box Green Mode — Energy-saving feature that throttles LAN ports to 100 Mbps. Disable in FRITZ!Box settings: Heimnetz → Netzwerk → Netzwerkeinstellungen → LAN-Einstellungen. Set ports to "Power Mode" (1 Gbps).
Device limitation — Older laptops may have only Fast Ethernet ports. Check in Windows Device Manager: Network Adapters → your adapter → Speed&Duplex should show "1.0 Gbps Full Duplex".

M-net vs. German ISPs in Bavaria

Deutsche Telekom — The national giant. Often limited to VDSL (max 250 Mbps) in Munich where M-net offers 1 Gbps Glasfaser. Telekom only wins if they have Glasfaser at your specific address.
Vodafone (Kabel) — Cable internet with fast downloads but 50 Mbps upload cap and shared cable congestion. M-net fibre is technically superior.
O2 / 1&1 — Resell Telekom's copper. Same VDSL limitations as Telekom, sometimes at lower prices.

M-net support: Call 0800 180 88 88 (kostenlos). M-net also has physical shops (M-net Shops) in Munich, Augsburg, and Nuremberg for face-to-face support.