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A reply from AI, it might has the answer: Impact of GPON ONU Transparent Mode on Web Interface Access When a GPON ONU operates in transparent mode, it acts as a bridged media converter, forwarding all traffic (including management frames) between the PON and Ethernet interfaces without processing. Here’s how this affects web interface access: 1. Web Interface (192.168.1.1) Accessibility Likely Unreachable: In transparent mode, the ONU does not terminate management traffic (e.g., HTTP/SSH). The web interface (typically hosted on the ONU’s embedded OS) becomes inaccessible because the ONU no longer responds to local IP requests. Workarounds: Direct Serial Connection: Use a console cable to access the ONU’s CLI and disable transparent mode. OLT-Based Management: Configure the OLT to forward management traffic (if supported). 2. Other Implications of Transparent Mode No NAT/Firewall: All traffic passes through untranslated (raw Layer 2 frames). No VLAN Processing: VLAN tags are preserved end-to-end. Limited Diagnostics: Counters/statistics may not be available locally. 3. When to Use Transparent Mode Bypassing ONU Processing: For scenarios requiring raw PON-to-Ethernet bridging (e.g., third-party router handling all Layer 3 functions). Custom Network Architectures: When the OLT or upstream device manages services. Key Recommendation To restore web access: Disable transparent mode via CLI (requires physical/serial access): Verify ONU IP assignment post-reboot. Transparent mode is powerful but sacrifices local management. Ensure your network design accounts for this trade-off! Would you like OLT-side configuration examples to preserve management access?