Hello,
I want my linux apache web server is accessible from the Internet (WAN)
I installed and configured on the client application noip2 Ubuntu when I ping my hostname it redirects me to my WAN ip is well done.
but no access to my apache web server.
what is missing from you:

-Disabling / iptables firewall configuration or firewall of my sagem modem.
-port forwarding on sagem modem (NAT).
-configuration of apache.

=> or something else? tell me how to do any work?