Apache: Lösung zu "VirtualHost x.x.x.x:80 overlaps with VirtualHost ..."

Nach dem Update auf den Linux Debian Squeeze Server startet der Apache WebServer plötzlich nicht mehr. Die anderen Dienste (Postfix, Dovecot, ...) laufen unverändert. In den Logdateien taucht dieser Fehler auf:

/etc/init.d/apache2 start

Reloading web server config: apache2
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:80 overlaps with VirtualHost 192.168.1.100:80, the first has precedence, perhaps you need a NameVirtualHost directive
[Thu Feb 10 20:43:22 2011] [warn] VirtualHost 192.168.1.100:0 overlaps with VirtualHost 192.168.1.100:443, the first has precedence, perhaps you need a NameVirtualHost directive
Die Datei /etc/apache2/ports.conf öffnen und folgende Zeile ändern:
NameVirtualHost *:80
wird zu
NameVirtualHost 192.168.1.100:80
Dann den Apache Server neu starten und ggf. mit "apache2ctl -S" die virtuellen Server prüfen. In OpenSuSE heißt die Datei "listen.conf" anstelle von "ports.conf".