Today I've noticed that the mDNSResponder in 10.10.4 is constantly using ~300KB/s of bandwidth. Constantly. All day.
Here it is in iStatMenus
And Activity Monitor:
Any ideas?
I thought reverting back to mDNSResponder from discoveryd was supposed to fix these problems!
Thanks,
Jamie
MacBook Air, OS X Yosemite (10.10.4)
Thank you.
I did some poking around and installed Cocoa Packet Analyzer to figure out where the Bonjour packets were coming from. I'd turned off all my other Macs, iPhones, etc.
It confirmed that it was definitely Bonjour and all the packets were obviously from my Canon printer. Hey presto! I turn around to find the printer had frozen and was obviously just stuck broadcasting Bonjour packets.
Phew!
Thanks for your help.
mDNSresponder does network lookups & manages bonjour info (local network device & service names used for sharing etc). If you are using other apps they will request domain & other records from DNS servers, mDNSresponder will do that for them. The apps could be a reason for the traffic.
It has received lots of data (181.6MB), but not requested much at all (46KB). It could simply be another device on your network broadcasting it's bonjour name a lot. Power off any devices you suspect & see if the inbound traffic ceases.
I'd also suggest stopping all third party apps & background jobs to see if one of those is part of the problem on this Mac.
You may also want to work out if the requests are internal network only or if they are going out to the internet, it's unclear to me if iStat can do that for you.
YAY, nice work 🙂
mDNSResponder constantly using 300KB/s of bandwidth (10.10.4)
