internal ip address, external, subnet mask
Posted on 2004-04-26
could somebody explain me what r the difference betn internal and external ip addresses,,also Subnet mask..why subnet mask is used..? what subnet mask is sometimes 255.255.255.255, but sometimes 255.255.255.0?? please explain with an example with simple english :) also, why somtimes MAC addresses r needed...also, what r the roles of Firewall, proxy server, DSN etc. i tried to read couple of books but the explanation is hazy..thanx in advance.