Originally Posted by
warcraftWidow ...latest Yosemite ... replaces the new (in Yosemite) discoveryd networking process with the tried and true mdnsresponder networking process...
Since updating to 10.10.4, I am now experiencing internet connectivity issues (both LAN & WiFi) after putting my MBP to Sleep. Upon reawakening, I have to Restart in order to regain internet connectivity.
[Here's my gear: MBP i7 17" (Mid 2010) with 8GB RAM, updated 10.10.3 to 10.10.4. All systems working great under 10.10.3.]
Let me add for clarity that I use DNSCrypt to set my DNS settings to those provided by OpenDNS. ...I'm currently using DNSCrypt v1.0.7, which works as it should when I'm connected to the internet; and, v1.0.7 came out to be compatible with El Capitan. At present, I don't believe my internet connectivity issue is due to DNSCrypt as I've not had any issues with prior versions.
When previously using 10.10.3, or any prior Yosemite version, I had no problems with regaining my internet connectivity upon reactivating my MBP from Sleep.
When I updated my MBP to 10.10.4, I did so over my LAN connection. Update completed smoothly; however, my first indicator of an issue, was when I took a break, prior to updating iTunes, and put my MBP to Sleep. Upon reawakening, my Airport Utility confirmed my Network was active, but I was not getting internet connection through my Airport Extreme (4th Generation). I had to do a MBP Restart in order to regain my internet connection to my MBP.
I can confirm this issue is also the case with connecting my MBP to my Network via WiFi. However, when I do have my MBP connected by WiFi (I'm connected now by WiFi to my Network as I write this post), my connection is reliable and good (I get 50+ Mbps Down & 6+ Mbps Up on my Comcast internet).
[All my iOS devices - iPhone 6 & iPad Air 2 - were getting and continue getting good solid WiFi connections through my AE. These solid, iOS WiFi connections were solid before and continued after updating both my iOS devices to iOS 8.4.]
So, my issue is strictly related to putting my MBP to Sleep and then reawakening, resulting in not getting reliable, reconnection to the internet without having to do a Restart.
I believe the issue most likely rests with some networking corruption caused by the reintroduced use of mdnsresponder in 10.10.4. [Oddly enough, I never had any issues with discoveryd in prior versions of Yosemite.] Moreover, I did not have any issues with mdnsresponder in OS versions prior to Yosemite.
Since I don't see news posts, in Mac media sites like iMore, about this being a universal issue, any ideas about how to resolve this networking corruption (if it is that)?