> Fixing the frame length doesn’t have any effect on higher-level protocols because they encode the packet size in their headers and do not rely on the actual Ethernet frame length.
Interesting. I just wrote a packet decoder and I specifically verify at each layer that the lower layer length matches. So for IP, in my decoder the IP datagram length must match exactly the ethernet frame length + link layer header. I didn't do this to be pedantic but rather to detect short frames, and then I decided that long frames were also errors.
You (author) are using uIP but I wonder what Linux or any other modern OS does. You don't specifically mention interoperability but I wonder if you've tested that.
Interesting. I just wrote a packet decoder and I specifically verify at each layer that the lower layer length matches. So for IP, in my decoder the IP datagram length must match exactly the ethernet frame length + link layer header. I didn't do this to be pedantic but rather to detect short frames, and then I decided that long frames were also errors.
You (author) are using uIP but I wonder what Linux or any other modern OS does. You don't specifically mention interoperability but I wonder if you've tested that.