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Power cycling the computer does what to the NIC

post #1 of 9
8/1/12 at 3:40pm
Thread Starter 
So this is a ridiculous question and I'm not able to find the nitty gritty details about what happens to the Ethernet Adapter in windows when you power cycle a computer. This is mildly important because my superior decided to dock me a point on a technical audit. I want to know if what he says is true, or if he's blowing smoke. Before I confront my supervisor about it I want to make sure my advice wasn't wrong. A bit of foreground, I work for a company that offers phone and remote support for specialized clinics in the medical field, and these little audits make or break you. And my superior refuses to speak to me about it as well.

Once I get a legitimate answer I'll post what I said and what the comment on my audit was.
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post #2 of 9
8/1/12 at 3:46pm
I don't get it. By power cycle, you mean turn off the computer for a few minutes and then turn it back on? What was his comment? It shouldn't cause any adverse effects... but obviously you will be disconnected from the network for a short period of time if the computer is off. And it depends on how the network/computer is setup for the re-acquisition of an IP address, but either way it shouldn't matter.
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post #3 of 9
8/1/12 at 3:58pm
Thread Starter 
That's exactly what I thought... The customer had to reset the IP on several computers with dynamic addresses, the ISP came in and set them to the wrong network, I changed it back and instead of walking him through release and renew ( I try not to make my customers feel dumb and have the take the simplest route for them) I told him to restart the computers to acquire the new address.

My audit from him said that by doing a power cycle not acquire a new IP address because the lease is set for certain amount of time.
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post #4 of 9
8/2/12 at 1:56am
Your supervisor is right im afraid, when you get the IP you computer gets a lease for X ammount of time, normaly this is quite high on home routers to make it so most people have the same IP most of the time,

Just powering the computer on and off it will get the same IP that it got before as it will have the same lease, its better to do renew as it may be givien a differnt IP (but then again most routers will just go oh you had 192.168.0.15 before .. lets give you that)
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post #5 of 9
8/2/12 at 4:54am
Thread Starter 
The computers were on a 192.168.1.x network and the router was set to DHCP. The customer has a dedicated server on the 192.168.0.x network and is the DHCP server. The fix for them, was to disable DHCP on the router and put the router back to the 192.168.0.x network. This problem is common when ISP's need to fix their issue by defaulting the router back to factory that doesn't match the scheme of the situation. Fully knowing the scenario, would that still apply?
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post #6 of 9
8/2/12 at 6:10am
So someone had factoryed the router which had screwed there network up, by turning DHCP off on the router it sovles it as everyone can now talk to the DHCP server, as you have removed the routers DHCP it can not reply to the DHCP from the windows pc's request therefore a reboot Would help and Would give you a new IP, (its physicaly impossible to get the old IP)

I think your supervisor has done a "I know more than you so trust me" routine and forgot to look at the problem wink.gif so under normal circumstances he ould have been right under this one no rolleyes.gif

BUTT big disclaimer wink.gif
Some residental routers are just down right broken so even turning the DHCP server off on it would have made the router still give out dhcp xD (that was a fun one for me .. bloody sky), so if you do confront your supervisor on this one make sure you state that in this isntance it both methods are the "right" one
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post #7 of 9
8/2/12 at 7:50am
In that situation I'd use a reboot as a last ditch effort, as a release/renew takes an exponentially shorter amount of time.
Quote:
My audit from him said that by doing a power cycle not acquire a new IP address because the lease is set for certain amount of time.

This would be true if the current DHCP pool still existed for 192.168.0.x, but is invalid as another DHCP server was introduced as a different network without existing lease data.
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post #8 of 9
8/2/12 at 8:23am
Thread Starter 
"While the notes say that the stations needed to have a release/renew done on that for their IP address, I disagree with
you that it will automatically pick up a new IP address upon reboot. An IP address is leased to a station, and many time will not seek
out another until the lease expires. You should manually release/renew on each station."

word for word,
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post #9 of 9
8/2/12 at 8:31am
or the box is rebooted should be added to that wink.gif it will seek a new ip address when a pc first boots ^_^
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