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Just to be clear, you mean Wi-Fi retransmits in the case of a collision a-la Ethernet, right? Was talking to someone a while ago who was under the impression th
by TallGuyShort 10y ago
Just to be clear, you mean Wi-Fi retransmits in the case of a collision a-la Ethernet, right? Was talking to someone a while ago who was under the impression that a TCP packet that didn't get ack'd within a certain window might be retransmitted by a Wi-Fi router that was closer to the destination. I was pretty certain it was wrong, but since you said, "Wi-Fi retransmits", just checking that's not what you meant.
- monocasa 10y agoYeah he's wrong, routers don't buffer for downstream reasons in any context I've seen. That being said, Wi-Fi retransmits on more than just collisions. Under the hood, Wi-Fi actually has it's own acknowledgement protocol beneath the Ethernet layer. The idea is that with electrical bus protocols like Thicknet, each tap has a pretty good view of the whole bus. For wireless you might see your own frames just fine, but the destination might not. So you need to retransmit not just when you see collisions, but when the destination hasn't explicitly acknowledged your packets.