[macintologist]

I won't have any apps open. Software Update will be idle.

Yet menumeters shows that my Mac is constantly downloading between 50-80k/sec, and I don't know where from.





How do I check which app/process is downloading or has network activity at the moment?

BTW, I just restarted my Mac and it went back to doing this automatically.

[eevyl]

You for sure have some sort of downloading app going on. Easy thing would be to check out Activity Monitor, it's to be expected that a networking app should be using some CPU.

[RevEvs]

Its not somethign else on the Internal network is it? iTunes etc?

[Hal Itosis]

I usually use File Buddy to search for recently modified files...
I once saw a mysterious download in progress. When I looked
File Buddy turned up this:

/var/db/crls/crlcache.db

Google on "Certificate Revocation Lists" for more info.
You can manually initiate the process in Terminal with
sudo crlrefresh r
but I think launchd is doing this periodically.

In the same folder is a file called "ocspcache.db" which
is related to some "Online Certificate Status Protocol".
(See man ocsp for more info).

Anyway... perhaps that's what you were seeing.

[macintologist]

I think it's mDNSResponse

It's running constantly at about 8% of my CPU. What is mDNSResponse doing downloading stuff all the time??

[Angus_D]

You can do "sudo lsof -i" to list processes which have open sockets.

[romeosc]

Originally Posted by Angus_D

You can do "sudo lsof -i" to list processes which have open sockets.

I tried running Activity monitor and it never runs just tries and ignores!

[tooki]

You sure it's not Software Update's background downloading of "critical" updates?

Anyway, use ethereal to see what network traffic is flowing, and fseventer to see what files are in active use.

tooki