Internet Sharing and Self-Assigned IP

i have an iMac hooked up to the internet via an ethernet connection. i have it set to share its internet connection wirelessly. i have a macbook pro that typically connects wirelessly via this shared connection.

recently (as in after the latest OS X update), i've been getting a "self-assigned IP" warning from my macbook pro. i thought it must have an issue, but then i checked another macbook pro - same thing. same goes for my iphone.

so... something weird is going on with my imac. the only way i was able to "solve" it was by restarting the imac. but that's obviously not acceptable.

anyone else have this problem?

2.16GHz MacBook Pro  2G RAM • 256MB VRAM, Mac OS X (10.5.7)

Posted on Aug 7, 2009 11:03 AM

48 replies

rdegraaf

Level 1

4 points

Nov 11, 2009 12:49 PM in response to bscepter

My situation:
- my macbook has a physical (cable) network connection
- my airport is switched off, but air-sharing through airport is on so my iPhone can access the internet through wifi.

The problem:
- when my MacBook goes to sleep, on wake up, the sharing is lost.

The problem is as follows; when your computer goes to sleep and sharing had enabled your airport, this setting is not remembered by Airport itself. That's why it does not start again after wake.

A bad solution is to do this dog trick again:
- Go back to System Preferences -> Sharing -> Toggle off 'Internet Sharing', Toggle on (again) 'Internet Sharing'.

SOLUTION (good):
- System Preferences -> Network -> Airport -> Advanced -> TCP/IP -> Configure IP v4 : using DHCP with manual Address + address = 10.0.2.1 (Configure IPv6 is off).
Go back to: System Preferences -> Network -> Airport -> click 'Turn Airport ON'
This now gives a Airport with a fixed IP and a dhcp deamon.
- System Preferences -> Sharing -> Toggle ON 'Internet Sharing'

Or short: simply select 'Turn Airport ON'; since this is done from the network menu, it will be remembered.

Hope this saves you lots of frustration.

Nov 15, 2009 7:43 PM in response to bscepter

I just tried your fix and while the airport does remember the setting I still lose connection to the internet with my iPhone.

rdegraaf

Level 1

4 points

Nov 16, 2009 12:32 PM in response to MacDesigner

Did you try mine as described above?

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Internet Sharing and Self-Assigned IP