Apple - iPad network woes
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From: ps56k on 29 Apr 2010 16:06 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 ? -- ---------------------------------- "If everything seems to be going well, you have obviously overlooked something." - Steven Wright
From: Aaron Leonard on 29 Apr 2010 16:53 On Thu, 29 Apr 2010 15:06:01 -0500, "ps56k" <pschuman_no_spam_me(a)interserv.com> 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/announcements/ipad-iphoneos32-stops-renewing-lease-keeps-using-IP-address.html has, I believe, current, complete and accurate information on the subject. Aaron
From: ps56k on 29 Apr 2010 23:27 "Aaron Leonard" <Aaron(a)Cisco.COM> wrote in message news:vdsjt59qbpaegqj1frca4do9v6mgkqteh0(a)4ax.com... > On Thu, 29 Apr 2010 15:06:01 -0500, "ps56k" > <pschuman_no_spam_me(a)interserv.com> 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/announcements/ipad-iphoneos32-stops-renewing-lease-keeps-using-IP-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 ?
From: DevilsPGD on 30 Apr 2010 03:31 In message <hrdio5$5r9$1(a)news.eternal-september.org> "ps56k" <pschuman_no_spam_me(a)interserv.com> 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.
From: Aaron Leonard on 5 May 2010 15:25
~ "Aaron Leonard" <Aaron(a)Cisco.COM> wrote in message ~ news:vdsjt59qbpaegqj1frca4do9v6mgkqteh0(a)4ax.com... ~ > On Thu, 29 Apr 2010 15:06:01 -0500, "ps56k" ~ > <pschuman_no_spam_me(a)interserv.com> 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/announcements/ipad-iphoneos32-stops-renewing-lease-keeps-using-IP-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 - I've configured my home DHCP server with fixed bindings for each client - e.g. the client with MAC 0014.51e5.cebb always gets the address 10.0.0.4. This of course completely prevents the iPad DHCP bug from causing any problems, as no other client can ever get the iPad's address. My daughter's iPad has had zero 802.11g network problems since she got it. (I can report, however, that dropping the iPad 2 feet onto a tile floor doesn't work so well, and isn't covered by warranty either.) Cheers, Aaron |