Listen 172.20.30.40:80
Listen 172.20.30.40:8080
Listen 172.20.30.50:80
Listen 172.20.30.50:8080

<VirtualHost 172.20.30.40:80>
DocumentRoot /www/example.com-80
ServerName www.example.com
</VirtualHost>

<VirtualHost 172.20.30.40:8080>
DocumentRoot /www/example.com-8080
ServerName www.example.com
</VirtualHost>

<VirtualHost 172.20.30.50:80>
DocumentRoot /www/example.org-80
ServerName www.example.org
</VirtualHost>

<VirtualHost 172.20.30.50:8080>
DocumentRoot /www/example.org-8080
ServerName www.example.org
</VirtualHost>