alt Hacker NewsWhy doesn't QUIC work well for machine-to-machine traffic ? Is it due to the lack of offloads/optimizations for TCP and machine-to-machine traffic tend to me high volume/high rate ?
Replies
extropy • 07/31/2025
The NAT firewalls do not like P2P UDP traffic. Majoritoy of the routers lack the smarts to passtrough QUIC correctly, they need to treat it the same as TCP essentially.
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dan-robertson • 07/31/2025
I think basically there is currently a lot of overhead and, when you control the network more and everything is more reliable, you can make tcp work better.
m00x • 07/31/2025
It's explained in the reddit thread. Most of it is because you have to handle a ton of what TCP does in userland.
exabrial • 07/31/2025
For starters, why encrypt something literally in the same datacenter 6 feet away? Add significant latency and processing overhead.
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QUIC would work okay, but not really have many advantages for machine-to-machine traffic. Machine-to-machine you tend to have long-lived connections over a pretty good network. In this situation TCP already works well and is currently handled better in the kernel. Eventually QUIC will probably be just as good for TCP in this use case, but we're not there yet.