I’ve been encountering continious wifi connection issues for a while now (6 months at least), specifically, my MacBook Pro would lose connection but when I turn the Airport off then on it would be OK. So many, many months ago I did some research and found it to be due to the AirPort Extreme Update 2008-001, which I rolled back to AirPort Extreme Update 2007-004. It fixed the connectivity issues for a couple of months, but recently I’ve been experiencing it again.
Looking through the logs again, I found this blog post: Macbook Pro: Network connectivity just disappears. He was getting the exact mDNSResponder errors, such as:
mDNSResponder: SetupAddr invalid sa_family 0
mDNSResponder: getifaddrs ifa_netmask for fw0(7) Flags 8863 Family 2 169.254.59.71 has different family: 0
The culprit: Apple’s Bonjour service. To disable it, here’s the complete how-to article, but the command you need to run is:
launchctl unload -w /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist
Hope this helps someone who’s experiencing the same issue. Ciao!