These are the default WAN MTU sizes used by Peplink routers:
| Wired WAN | 1440 bytes |
| Cellular WAN | 1428 bytes |
| Mobile Internet | 1492 bytes |
| WIFI WAN | 1500 bytes |
| Speedfusion | SpeedFusion tunnel will use MSS clamping for TCP connections using the smallest MTU size across all the WANs. |