🔌 Why the Bosch 3000 Ethernet Module Has Issues with Telstra Modems

The Bosch Solution 3000, using the B426-M Ethernet module, has known compatibility issues with Telstra Smart Modems—especially Gen 2 and Gen 3. The problems usually stem from how Telstra modems manage IP connectivity, especially when switching between NBN and 4G backup.

📡 Main Reasons

1. 4G LTE Failover:
   Telstra modems automatically switch to 4G backup when they detect a problem with the fixed-line (NBN) connection. This change interrupts the Ethernet connection used by the Bosch module, leading to dropouts or failure to connect with apps like Bosch RSC+.

2. IPv6 Handling:
   Telstra Gen 3 modems have IPv6 features enabled by default. If IPv6 isn’t properly configured or supported by the Bosch module, it can lead to routing issues, disconnections, or the module being unable to communicate with the Bosch cloud servers.

3. APN Configuration:
   Even if the SIM isn’t in active use, incorrect or blank APN settings on the modem can cause unexpected behavior in the modem’s networking layer—leading to intermittent communication issues with the Bosch Ethernet module.

✅ Bosch’s Recommendations

• Enable IPv6 in the modem settings to improve stability.

• Check and enter correct APN settings—this ensures consistency, even if LTE fallback isn’t used.

• Disable 4G/LTE failover if possible—this prevents the modem from automatically changing networks and dropping the Bosch connection.

• Restart the IP module (disconnect from the BUS and reconnect) to refresh the IP assignment.

• Update the firmware on the B426-M module to the latest version available (e.g., v3.10.030), which improves performance and reliability.

🛠️ Recommended Steps