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

(cafbit.com)
354 points timdoug | 3 comments | 12 Jul 11 17:04 UTC | HN request time: 0.621s | source
1. juliano_q ◴[12 Jul 11 19:39 UTC] No.2756176[source]▶
The mac implementation is good for 99% of the times, since it is really fast, but the 1% of the times that it steals an ip adress it is really a pain in the ass. I don't mind to wait a few seconds to get a connection in the stardard way.
replies(1): >>2756343 #
2. pohl ◴[12 Jul 11 20:18 UTC] No.2756343[source]▶
...but the 1% of the times that it steals an ip adress...

Could someone explain how we're imagining this might happen? If my Dell Precision laptop is using the contended IP Address, then why didn't its interface's mac address get returned by the ARP who-has request for that IP?

replies(1): >>2757986 #
3. caf ◴[13 Jul 11 06:04 UTC] No.2757986[source]▶
The problem may well be that specific ARP request - the one at 0.0180 in the original article. It appears to have a non-zero sender IP address, which means it doesn't conform to a classic ARP probe. The Dell Precision laptop, upon seeing an ARP request appearing to come from itself, might well decide that an address conflict is occuring.