WiFi IP address lost when activating internet sharing

iMac (24-inch, Early 2009)
I'm having troubles with sharing my wifi to internet.
Worked great untill today. Wifi IP address (reserved/dedicated address from DHCP Airport Extreme 192.168.0.4) disappeares when the Internet Sharing is activated. Wifi in Network turnes orange and notes that no IP address is available.
When the Internet Sharing is turned off, the DHCP connection seemes to restore and the normal IP address returns.
Both IPv4 and IPv6 are active and available on the network. IPv6 address lost also.
Did a complete rework of the Airport Extreme, complete rework of the iMac network environment, dumped all settings (trashed the config folder) rebooted modem, router, iMac in different order. Repeated everything with firewall off, tried again without encryption, no results.
Everything works great, except for the Internet share (over ethernet for devices using wifi).
DHCP / IP lost the moment the sharing is activated and restored the moment it is killed.
Anyone got any suggestion?

"Stuffed up" is not really a term we use much in networking. What did you actually do? Using what software? How are you connected to your local network, and how is that connected to the internet?
What happens if you use the Apple menu to access System Preferences/Network?

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iOS 6 Wifi Problems/Fixes
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
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~~~~~~~~~~~~~~~~~~~~~~~
Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
WiFi Connecting/Troubleshooting
http://www.apple.com/support/ipad/wifi/
How to Fix: My iPad Won't Connect to WiFi
http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet
http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
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https://discussions.apple.com/thread/4010130
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~~~~~~~~~~~~~~~
If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
~~~~~~~~~~~~~~~~
YouTube is not now part of iOS 6.
However, you can go to the App Store and do a search using YouTube. You can download several YouTube apps: YouTube (for the iPhone, a IPad app is in work), several users like Jasmine and YouPlayer.
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Message was edited by: BDAqua

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Edit Feed Details… | Delete Feed… | Transfer Feed…
You should not change "Original Feed" unless you move your original feed to a new domain or a new location on your existing server. Also, changing "Feed Address" will require you to update your feed subscribers with your new address; the previous feed address will no longer work.
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<pre>
#!/bin/bash -l
currarp=`arp -a`
if [ -f /tmp/arpcache ]
then
anychange=`echo "$currarp"|diff -q - /tmp/arpcache`
if [ "$anychange" ]
then
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echo "$change"|syslog -s
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fi
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echo "$currarp" > /tmp/arpcache
fi
exit 0
</pre>
And then make it execute every minute with cron:
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(add a line to file with $EDITOR:)
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After recent update to airport on iMac, the wifi connection is lost when it goes to sleep and requires turning off wifi and turning it on to reestablish contact.

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Hello all,
I'm experiencing a serious problem with the lumia 920. It seems impossible to share my internet connection. Something I normally use for several hours a day. If this problem can't be fixed soon, ill be forced to swithc back to iphone or htc.
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When turning "internet sharing" on:
Connection not shared - There is no cellular data connection to share right now. Check your cellular settings and signal, and try again.
Important remarks
Belgium - cellular provider is Mobistar
I can browse, sync email, etc over the provider's network ans send and receive MMS.
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OS Version 8.0.10211.204
Firmware revision: 1232.5957.1308.0002
Access point :
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APN pro.web.be (for professional subscribers)
MMS APN mms.be
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updated the Nokia Access Point app
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deleted the manually created access point
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Hi,
I had the same problem. But I let it go after weeks of corresponding with Mobistar.
Yesterday I went to a Mobistar shop, the guy tried lots of thing I already tried (different apn's, ...).
Then he told me the it's a problem with business clients. They have to use the apn web.pro.be, where internet sharing doesn't work (he doesn't know why).
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regards,
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WiFi IP address lost when activating internet sharing

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