when I scan my network using nmap it gives me something like this
#nmap -vv -Pn -sV -sT -p80 -oG - 116.135.*.*
# Ports scanned: TCP(1;80) UDP(0;) SCTP(0;) PROTOCOLS(0;)
Host: 116.135.*.* () Status: Up
Host: 116.135.*.* () Ports: 80/open/tcp//http//Allegro RomPager 4.07 UPnP|1.0 (ZyXEL ZyWALL 2)/
But When I scan the same ip from outside it give me / [also cant ping it from outside]
# nmap -vv -Pn -sV -sS -p80 -oG - 116.135.*.*
# Ports scanned: TCP(1;80) UDP(0;) SCTP(0;) PROTOCOLS(0;)
Host: 116.135.*.* () Status: Up
Host: 116.135.*.* () Ports: 80/filtered/tcp//http///
# Nmap done at Wed Nov 11 15:49:50 2015 -- 1 IP address (1 host up) scanned in 2.13 seconds