Apple - iPad network woes

I seem to recall from a few years back
that there were some problems with Apple & local networks
at some schools... was it with the iTouch ?

Now - with the iPad, I seem to recall some recent news
again about probs at colleges with DHCP and other issues.

Have these issues been identified and resolved ?

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"If everything seems to be going well,
you have obviously overlooked something." - Steven Wright

"Aaron Leonard" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Thu, 29 Apr 2010 15:06:01 -0500, "ps56k"
> <(E-Mail Removed)> wrote:
>
> ~ I seem to recall from a few years back
> ~ that there were some problems with Apple & local networks
> ~ at some schools... was it with the iTouch ?
> ~
> ~ Now - with the iPad, I seem to recall some recent news
> ~ again about probs at colleges with DHCP and other issues.
> ~
> ~ Have these issues been identified and resolved ?
>
>
> http://www.net.princeton.edu/announc...P-address.html
> has, I believe, current, complete and accurate information on
> the subject.
>
> Aaron

great article -
think I'll reset my home DHCP lease time,
just to see how things change with our own network - or not -

If I'm sitting, with my laptop, and my lease expires,
does the stack request a new lease at that time ?
or does it just keep using the existing IP until a reboot ?

In message <hrdio5$5r9$(E-Mail Removed)> "ps56k"
<(E-Mail Removed)> was claimed to have wrote:

>If I'm sitting, with my laptop, and my lease expires,
>does the stack request a new lease at that time ?
>or does it just keep using the existing IP until a reboot ?

A properly designed and configured DHCP client will attempt to renew the
current IP from the current DHCP server at 50%.

If this fails, the client will continue attempting to renew occasionally
(starting at 50% of the remaining time before the 87.5% mark, each time
going 50% closer but not more than once per 60 seconds) until 87.5% of
the lease time has expired.

Once at 87.5% the DHCP client starts attempting to contact any available
DHCP server (rather than only the original one) to renew.

Once the lease expires a DHCP client MUST immediately stop using the IP.
Similarly, if the client receives a DHCPNAK at any point then the lease
must be invalidated immediately even if not yet expired.