Why is my ping higher on M-net DS-Lite?

M-net uses Dual-Stack Lite (DS-Lite) by default, meaning you share a public IPv4 address with other customers via a tunnel. This extra 'tunneling' step can add a few milliseconds to latency and cause 'Strict NAT' issues in games. You can book the 'IPv4 Option' (~€4.90/mo) for a real dual-stack connection.

How do I login to my M-net FRITZ!Box?

Open a browser and type http://fritz.box or http://192.168.178.1. The password is printed on the bottom of the router (unless you changed it). M-net pre-configures these devices, so do not factory reset unless necessary.

What does the red 'Info' light mean on FRITZ!Box?

A blinking red 'Info' light on your FRITZ!Box usually indicates an authentication error (PPPoE error) or a failed firmware update. If the 'Power/DSL' light is also blinking, the physical line signal is lost.

Why do I only get 100 Mbps on my 1000 Mbps fiber?

This is almost always due to using an old CAT5 Ethernet cable (limited to 100 Mbps) or a device with a Fast Ethernet port. Ensure you are using CAT5e or CAT6 cables and that your PC's network card is set to '1 Gbps Full Duplex'.

M-net Speed Test

This tool verifies Internet speeds for M-net customers in Bavaria (Munich, Augsburg, Nuremberg). M-net is a pioneer in pure fiber optics (FTTH/FTTB), offering ultra-fast plans like "Surf&Fon-Flat 1000".

Because M-net uses high-performance fiber, any slowdown is usually due to local WiFi issues or the DS-Lite configuration affecting specific services.

Interpreting Your M-net Results

Download Speed:
- Gigabit Plan: Wired should be ~940 Mbps.
- 600 Plan: Wired should be ~600 Mbps.
If speeds are stuck at exactly 90-95 Mbps, check if your LAN port is in "Green Mode" (100 Mbit) in the FRITZ!Box settings.

Upload Speed: M-net fiber plans are typically asymmetric (e.g., 1000 Down / 300 Up), but still much faster than DSL or Cable upload speeds.

Ping (Latency): Excellent (3-10ms) to Munich servers. However, DS-Lite users may see slightly higher fluctuating ping in IPv4 games.

FRITZ!Box Router Login (192.168.178.1)

M-net supplies premium AVM FRITZ!Box routers tailored for their network.

Device	Login & Features
FRITZ!Box 7590 AX / 7530 AX (High-end WiFi 6)	http://fritz.box IP: 192.168.178.1 The standard for "Surf&Fon" plans. Supports Supervectoring and WAN.
FRITZ!Box 5530 Fiber (Direct Fiber connection)	http://fritz.box Connects directly to the glass fibre socket (GF-TA) without an extra ONT modem.

Troubleshooting Lights (Red Info LED)

Power/Fiber Light:
- Blinking Green: Syncing. Wait 2-3 minutes.
- Blinking Red: Cabling error or line interruption. Check the fiber patch cable.

Info Light:
- Red: Internet login failed. M-net services might be disrupted, or the router config is corrupted.

The DS-Lite "IPv4 Option" Issue

M-net uses Dual-Stack Lite (DS-Lite) to manage IP addresses. This means you have a public IPv6 address but share an IPv4 address.

Impact: Console gaming (Xbox/PlayStation) may show "Strict NAT", and accessing your home network (VPN/NAS) from outside via IPv4 is impossible.

Solution: You can book the "IPv4 Option" for a small monthly fee (approx €5) to get a real, public Dual-Stack IPv4 address.

When to Contact Support (0800 180 88 88)

Call M-net support if:

The "Power/Fiber" light blinks for more than 15 minutes.

You need to request the IPv4 Option for gaming/work.

You are moving apartments (M-net fiber availability is address-specific).

M-net Speed Test FAQs

Is M-net better than Telekom? M-net often owns the physical fiber lines in Munich/Augsburg (FTTB/FTTH), whereas Telekom relies on VDSL vectoring in many buildings. If M-net offers Fiber and Telekom offers VDSL, M-net is technically superior.

Can I use my own router? Yes, router freedom allows this. However, configuring a non-FRITZ!Box on M-net requires setting the correct VLAN ID (usually 40) and entering PPPoE credentials manually.

Why is my WiFi slow in the evening? Even with fiber, WiFi interference from neighbors is common in Munich apartment blocks. Log in to FRITZ!Box > WiFi > Radio Channel and set it to 'Auto' to avoid congested channels.