Lost internet connection when waking

Mac Pro (Early 2009) running Yosemite 10.10
Airport Extreme as router - wired connection to Airport Extreme
Since installing Yosemite:
When waking from sleep I find that I have lost my IP address and am forced to reboot.
Today, I could not get connected via my wired connection even after rebooting
My 2008 MacBook Pro has had no problems
I have reinstalled Yosemite twice.
Migrated to a clean install of Yosemite.
Zapped the PRAM,
Deleted the System Configuration folder

I've got the same problem but with different physical characteristics.
I am running a 2011 MBP over wifi connections with a Time Capsule router. Problems started when I installed Yosemite, nothing solves permanently. Sometimes I just have to log out, other times I have to do a complete reboot.

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Message was edited by: InThisMoment

OK. thanks. I did manage to find another posting that was very helpful on this problem.
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I wonder if someone can help me with this odd problem I've been having. I have a Mac Book Pro that is wirelessly connected to the internet via Airport Extreme. I also have a Roadrunner cable modem hooked up to my TV (in the Living room) and to Vonage (in my home office about 30 ft away). The Vonage phone box is connected to Airport base station (also in the office) and the base station is connected to my PC (also in the office). My Mac Book works fine when it is on my dining room table, but once I move over to the couch (which is only about 5 ft away, but closer to the cable modem, Vonage box and Airport base station), I lose my internet connection, even though it shows that I have a strong Airport signal. Not only do I lose the connection, my Vonage phone box starts to blink (it should be a steady green light), and my phone stops working. My internet connection on my PC also stops working. Once I move the Mac Book back over to the dining table, everything works again (after a few minutes). What could be causing this, and how can I fix it? Everything was working fine up until about a few days ago. I was able to move my Mac Book anywhere with no problem. Now I move it to the couch and everything shuts down! So much for the convenience of WiFi. Help if you can, please! Thank you.

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If you were using MAC filtering on your router, you would know how to fix this. If you do not know what it is, you do have have MAC filtering enabled on the router -- or you are not the router administrator. So -- don't worry about MAC filtering or go find the router administrator and ask to be let in (you will need the MAC address of the printer -- get a print out of the network page from the printer).
===========================================================================
Loss of network connection
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Wireless Printing Center
Take a look around at the sections -- you might start at the Troubleshooting steps and see what jumps out at you -- you might find your "issue" is right there and you can find the steps to fix it right away.
Click the Kudos Thumbs-Up to show you appreciate the help and time from our Experts.
Although I strive to reflect HP's best practices, I do not work for HP.
Click Accept as Solution when the Answer is a good Fix or Workaround!
Kind Regards,
Dragon-Fur

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#!/bin/ksh
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Lost internet connection when waking

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