Advantages of RFC 4638 (PPPoE with Jumbo MTU / Baby Jumbo Frames)

1. Full 1500-byte MTU Support

   • Eliminates the traditional 8-byte overhead penalty of PPPoE (1492 MTU).

   • Allows end-to-end 1500-byte Ethernet frames, improving compatibility with many ISPs and reducing fragmentation.

2. Improved Performance

   • Fewer fragments = lower CPU load on routers and end devices.

   • Can result in higher throughput, especially on gigabit and multi-gigabit connections.

   • Reduces latency introduced by fragmentation.

3. Better Compatibility with Modern Networks

   • Many ISPs (especially fiber providers) now support RFC 4638, expecting CPE devices to handle it.

   • Aligns TP-Link products with industry standards used by other vendors.

4. Enhanced IPv6 Support

   • IPv6 requires larger headers, so having full 1500-byte MTU reduces the risk of issues with Path MTU Discovery and fragmented IPv6 packets.

   • Ensures smoother IPv6 performance for dual-stack deployments.

5. Improved Application Reliability

   • Certain applications and VPNs (e.g., IPsec, WireGuard, OpenVPN) perform better with a full 1500-byte MTU.

   • Reduces the chance of dropped sessions or degraded performance due to MTU mismatch.

6. Future-Proofing TP-Link Devices

   • ISPs are increasingly moving towards full-MTU PPPoE.

   • Adding RFC 4638 support ensures TP-Link devices remain compatible and competitive.

   • Strengthens TP-Link’s position in high-performance broadband markets.