In wRTOS, jumbo frame sizes are configured for an interface with Maximum Packet Size, which includes 14 bytes of Ethernet header and does not include FCS. The IP MTU is automatically set to (Maximum Packet Size - 14).
Note: All tested drivers support Jumbo Packets. To view a list of supported network cards, go to the IntervalZero Customer Center or contact IntervalZero Customer Support.
Note: Maximum frame size is hardware-specific, and you should consult your NIC card's hardware documentation for acceptable values.
UDP or ICMP over Fragmented IP
For User Datagram Protocol (UDP) or Internet Control Message Protocol (ICMP) over fragmented IP, if two devices are configured with different MTUs, they can only communicate with IP frame sizes of smaller MTU. To run UDP or ICMP over fragmented IP protocol, the IP MTU must be configured to the same number. Windows devices typically configure JUMBO frame sizes of IP MTU + 14 bytes of Ethernet header.
Related Topics
- Converting a Windows Device to wRTOS
- Configuring Interfaces
- NIC Driver Function Overview
- Using RAW Sockets
- TCP/IP Overview
- TCP/IP Components
- Diagnosing Configuration Problems
- Tips, Tricks and Configurations Hints
- wRTOS Virtual Network Adapter
- TCP/IP Samples
