11–20 of 91 posts
Super impresssive! I would absolutely love to work on such projects and admire the passion and countless hours that went into understanding and then building the system. Retirement is not something desirable for me, so maybe that's when I'll spend my time on hardware and software projects like this.
https://mirror.math.princeton.edu/pub/oldlinux/Linux.old/net...
IIRC it over-wrote the buffer the CPU tried to read with new packets from the network or something like that. I had it for a while in Linux and the performance really was bad. :-D
Super impresssive! I would absolutely love to work on such projects and admire the passion and countless hours that went into understanding and then building the system. Retirement is not something desirable for me, so maybe that's when I'll spend my time on hardware and software projects like this.
What's stopping you from starting today?
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.
So, is it better or worse than the Etherlink 3c501 ? :-D https://mirror.math.princeton.edu/pub/oldlinux/Linux.old/net... IIRC it over-wrote the buffer the CPU tried to read with new packets from the network or something like that. I had it for a while in Linux and the performance really was bad. :-D
It's amazing how much stuff is hidden from view by drivers and firmware updates.
> I needed a hardware MAC address filtering.
What I really love is the stack trace of reasoning, that's very pedagogical, and that you either worked out lots of things from first principles or felt the need to explain them is if from naive perspective.
Also, while impractical for real world networking I don't think this is just idle play. What with backdoors turning up in over-complex network network chips you may find a more serious readership/project motive in the future.
I just went back and reread the 10BASE-T write up as well.
That’s super cool you can even get 2.6kB out of it.
So, is it better or worse than the Etherlink 3c501 ? :-D https://mirror.math.princeton.edu/pub/oldlinux/Linux.old/net... IIRC it over-wrote the buffer the CPU tried to read with new packets from the network or something like that. I had it for a while in Linux and the performance really was bad. :-D
Mine is better because it has two buffers :) But still, only one received frame is kept.
> 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 di…