Close port 80?

Question

Apache HTTP Server

there is a server, several ip, sites sit on some, on one vpn. if you drive in the vpna address (via the web) - the site opens. although the dns does not point any of the sites to this ip.
how can you close port 80, through iptables for this particular ip (ip vpna - do not touch others), no matter what is available from outside?

Answer 1

Raise the 80th port only on the necessary ip, for example. Apache allows you to do this.

Answer 2

# /sbin/iptables -A INPUT -p tcp -i eth1 -s ! 1.2.3.4 --dport 80 -j DROP