[newbie] Telnet/IP MASQ

[Nadin Merali]

I dont know what I changed, but I can telnet into my Linux machine
(Firewall) from my internal network, however I can do it from the
internet.

What is the ipchain command I need to allow me in again?,  I also cant
ftp, access the apache website in my linux server.

And my other question is what is the difference in IPCHAINS for INPUT,
OUTPUT and FORWARD, I am confused as to the meaning of these

Thanks

Nadin