가상호스트가 적용이안되네요. 모두 똑같은 곳으로 가버리네요

<VirtualHost 12.34.56.78>
    ServerAdmin webmaster@abc.com
    DocumentRoot /home/abc/public_html
    ServerName abc.com
    ServerAlias www.abc.com
</VirtualHost>

NameVirtualHost 12.34.56.78 <- 이렇게 추가 시켜 줘 보세요. 

<VirtualHost 12.34.56.78>
    ServerAdmin webmaster@def.com
    DocumentRoot /home/def/public_html
    ServerName def.com
    ServerAlias www.def.com
</VirtualHost>