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Linux - Networking This forum is for any issue related to networks or networking.
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Old 08-19-2015, 03:10 PM   #1
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Unhappy How to do very low-level Ethernet communication

Here's the setup:
I have two computers connected to each other by Ethernet with a crossover cable. They are the only two computers on this simple network.

I want to send data from A to B with the smallest latency possible.

I was looking at UDP. Then I realized that I don't really need a source or destination ip address, since there is only one source and one destination possible. Is it possible to send a UDP packet without an IP header, etc? Is there a library that supports this sort of communication? I am relatively new at networking, so please overlook any incorrect use of technical terms.
Old 08-19-2015, 05:58 PM   #2
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Hello and welcome to LQ.

UDP is connectionless so it is not a great choice for accuracy.

There have been all sorts of network models over the years. I have a graphic of all the major ones but currently the tcp/ip model is most used. Since you said UDP then you are kind of stuck with tcp/ip. While it doesn't really need an ip in a very technical way, you can fool it a bit with static arp.

I doubt you would get much latency on a cross over or patch cable between systems.

The way you speed up packets is to reduce how the system and switches handle packets. Things like wirespeed switches, maybe looking at how checksum is managed, fifo issues and such.

You might look at other protocols maybe?
Old 08-19-2015, 07:18 PM   #3
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If data integrity is important (and I can't think why it wouldn't be), then using one of the established protocols is sensible. Assuming Gigabit connectivity, I can't imagine that any low-level protocol you could create would be as reliable and fast. The OSI model is a proven well-established model. You should research the layers and established data transfer protocols before re-inventing the wheel.

Anyway You might be interested in these discussions based on similar thoughts


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