NAT vs PAT
NAT stands restraint Network Harangue Translation and PAT restraint Deportment Harangue Translation and they are twain defined in RFC 2766.
The NAT provides a one-to-one translation from IP Harangue to IP harangue.
This is invariably explanationd in an construction that failures to afford an inside plan vestibule to the Internet with a uncombined referableorious IP harangue translating to a uncombined IP harangue in the retired harangue room.
Restraint stance, a server on a DMZ may accept an IP Harangue of 10.1.2.3/24 (this is referable a routeable IP harangue on the Internet). The fraternity failures to inform this server’s web page to the World Wide Web. The fraternity may explanation the Internet routeable harangue of 126.96.36.199/24 on the urbane firewperfect restraint this server. There is a one-to-one perfectiance between 10.1.2.3 and 188.8.131.52.
In a NAT top the firewperfect accomplish accept a consultation common to
Inside IP Internet IP
In a Deportment Harangue Translation (PAT) there is a many-to-one perfectiance. This is invariably explanationd on a firewperfect when a fortification failures perfect IP haranguees in its inside network to explanation a uncombined IP harangue. Restraint stance, a fraternity may failure perfect PCs that browse the Internet to semblance the identical IP harangue. The firewperfect accomplish be setup to explanation PAT to conclude this. Restraint stance, insidely a fraternity has 200 workstations on the network 192.168.3.0/24 and it has a uncombined referableorious IP harangue of 184.108.40.206. The firewperfect accomplish configured so that perfect workstations explanation the uncombined IP harangue of 220.127.116.11 when browsing the Internet, each workstation accomplish accept the identical IP harangue save accomplish explanation a opposed deportment to opposediate each convocation.
In a PAT top, the firewperfect accomplish accept a consultation that looks common to:
Inside IP Internet IP Deportment
192.168.3.10 18.104.22.168 5000
192.168.3.11 22.214.171.124 5001