Managing the Unmanaged Switch

3 days ago

The TP-Link TL-SG108 is an 8-port Gigabit Ethernet plug-and-play desktop switch based on the Realtek RTL8370N chip.
The RTL8370N chip, found in many low-cost switches, includes an embedded 8051 microcontroller and can support web-managed features via software limitations.
The TL-SG108 lacks a MAC address, default IP, and VLAN tagging support out of the box, but its firmware can be modified by replacing the SPI flash chip with a larger one.
Firmware from a similar switch (GS308Ev4) can be flashed onto the TL-SG108 to enable VLAN management, though this may cause LED and reset functionality issues.
MAC address and serial number data are stored at offset 0x1fc000 in the firmware, allowing for easy modification to avoid conflicts on the network.
Converting an unmanaged switch to managed may not be cost-effective compared to buying a used managed switch or one compatible with OpenWrt.
The Araknis Networks AN-110 switch also uses the RTL8370N chip but lacks VLAN features despite having a web interface; flashing custom firmware proved unsuccessful.
TP-Link underwent a restructuring in 2024, leading to brand variations, but firmware from similar models like the Mercury SG108 Pro did not enable management on the TL-SG108.

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