Martin von Siebenthal
Level 1 (0 points)

Q: iMac network issues (wireless and ethernet)

Hi, I'm using an iMac (early 2009) with OS X 10.7.5 and I'm experiencing weird network issues. After starting up the iMac all network connections (wifi and ethernet) won't work even if they got all the settings from the DHCP server (IP-adress, subnet mask, default gateway, dns server). After turning off a network connection (wifi or ethernet) and turning it on again it works - with the same IP-adress etc. It really doesn't make sense to me.

 

I tried to reset SMC and repaired disk permissions.

 

Any ideas or similar problems?

 

Thanks, Martin

iMac, Mac OS X (10.7.5), early 2009

Posted on Mar 12, 2013 9:54 AM

by Martin von Siebenthal,Solvedanswer
Martin von Siebenthal Martin von Siebenthal
Level 1 (0 points)
A:

Thanks for the answer! I've tried everything:

  • New network location
  • Manual connection to WiFi
  • Manual DNS settings

But it didn't help.

 

Anyway while trying out I found a solution: I patched the iMac directly to the firewall not going through the switch. It still doesn't make sense but it works

Posted on Mar 13, 2013 4:55 AM

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Martin von Siebenthal

Q: iMac network issues (wireless and ethernet)

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  • by BDAqua,

    BDAqua BDAqua Mar 12, 2013 11:12 AM in response to Martin von Siebenthal
    Level 10 (123,905 points)
    Mar 12, 2013 11:12 AM in response to Martin von Siebenthal

    Hi Martin,

     

    Make a New Location, Using network locations in Mac OS X ...

     

    http://support.apple.com/kb/HT2712

     

    10.7 & 10.8…

     

    System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.

     

     

    10.5.x/10.6.x/10.7.x instructions...

     

    System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.

     

    The interface that connects to the Internet should be dragged to the top of the list.

     

    If using Wifi/Airport...

     

    Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.

     

    For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...

     

    208.67.222.222

    208.67.220.220

     

    (There may be better or faster DNS numbers in your area, but these should be a good test).

    Click OK.

  • by Martin von Siebenthal,Solvedanswer

    Martin von Siebenthal Martin von Siebenthal Mar 13, 2013 4:55 AM in response to BDAqua
    Level 1 (0 points)
    Mar 13, 2013 4:55 AM in response to BDAqua

    Thanks for the answer! I've tried everything:

    • New network location
    • Manual connection to WiFi
    • Manual DNS settings

    But it didn't help.

     

    Anyway while trying out I found a solution: I patched the iMac directly to the firewall not going through the switch. It still doesn't make sense but it works