freshclam: Mirrors and mirrors.txt

freshclam downloads the database from http://database.clamav.net. This is a round robin record that tries to equally balance the traffic between all the database mirrors:

Mirror	IP	Location	Administrator
clamav.man.olsztyn.pl	213.184.16.3	Olsztyn,	Robert d`Aystetten
		Poland	dart*man.olsztyn.pl
avmirror1.prod.rxgsys.com	64.74.124.90	USA	graham*rxgsys.com
avmirror2.prod.rxgsys.com	207.201.202.73	USA	graham*rxgsys.com
clamav.e-admin.de	212.162.12.159	Dusseldorf,	Andreas Gietl
		Germany	a.gietl*e-admin.de
clamav.essentkabel.com	195.85.130.84	Netherlands	Chris van Meerendonk
			mirror*essentkabel.com
clamav.inet6.fr	62.210.153.201	France	Lionel Bouton
	62.210.153.202		clamavdb*inet6.fr
clamav.netopia.pt	193.126.14.29	Portugal	Miguel Bettencourt Dias
			mbd*netopia.pt
clamav.sonic.net	209.204.175.217	USA	Kelsey Cummings
			kgc*sonic.net
clamav.nettron.co.za	160.124.112.17	South Africa	Ryan Zwankhuizen
			info*nettron.co.za
clamav.nchost.net	203.208.228.153	Singapore	Nicholas Chua
			nicholas*ncmbox.net

In the local database directory there is a mirror.txt file which freshclam reads every time it tries to update the database. freshclam connects to a first server from the list and if it fails a next one will be used. Normally you shouldn't touch this file unless you want to use your own local mirror for database updates.