Why does Apache2 open only one site at all addresses?

Question

Apache HTTP Server

Good afternoon! There is a server with 3 sites, one of which is the main stub for the server, which is displayed when you access the server by IP address.
Stub Settings

<VirtualHost *:80>
  ServerName 123.123.123.123 #внешний ip сервера
  ServerAdmin [email protected]
  DocumentRoot /var/www/default
  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Site settings 1:

<VirtualHost *:80>
  ServerName dom1.site.ru
  ServerAdmin [email protected]
  DocumentRoot /var/www/site1
  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Site settings 2:

<VirtualHost *:80>
  ServerName dom2.site.ru
  ServerAdmin [email protected]
  DocumentRoot /var/www/site2
  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

Tell me what's wrong? Because when accessing literal addresses and IP, a stub opens.
The subdomains dom1.site.ru and dom2.site.ru are bound by A record on the server IP
. At the same time, it is necessary that the sites also open on the internal IP ... But, as I see it, it is necessary to hang all the sites on different ports. Is it true or is there an easier way?