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Rapid DHCP: Or, how do Macs get on the network so fast?

(cafbit.com)
354 points timdoug | 4 comments | 12 Jul 11 17:04 UTC | HN request time: 0.204s | source
1. flogic ◴[12 Jul 11 21:32 UTC] No.2756697[source]▶
Rather than asking why the mac is so fast, the correct question is "why the hell is dhcpcd so slow?". There's a full second before it does anything.
replies(2): >>2757450 #>>2763026 #
2. vacri ◴[13 Jul 11 01:42 UTC] No.2757450[source]▶
I think it's apples and oranges to some degree - a macbook pro with a venerable operating system versus a tablet with one that's still heavily in development.

Better to compare galaxy vs ipad tablets, or osx vs other unix vs windows

replies(1): >>2757580 #
3. krakensden ◴[13 Jul 11 02:45 UTC] No.2757580[source]▶
The tablet is using dhcpcd, which is plenty venerable.
4. tintin ◴[14 Jul 11 13:58 UTC] No.2763026[source]▶
The client is waiting a full second to give all DHCP servers the ability to answer the request for an IP address offer.

Then the client will choose the best offer and will tell that DHCP server it took the offer.

I think after that the DHCP server is letting all other DHCP servers know the current status of available IP addresses. Maybe that will also take some time (with a lot of waiting, time-outs and stuff).

But then the question remains why should it take more than 2 seconds?