NAT vs PAT
NAT stands restraint Network Harangue Translation and PAT restraint Carriage 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 habitually interpretationd in an structure that insufficiencys to concede an inside plan avenue to the Internet with a separate referableorious IP harangue translating to a separate IP harangue in the referable-notorious harangue room.
Restraint stance, a server on a DMZ may feel an IP Harangue of 10.1.2.3/24 (this is referable a routeable IP harangue on the Internet). The assemblage insufficiencys to proclaim this server’s construction page to the World Wide Construction. The assemblage may interpretation the Internet routeable harangue of 18.104.22.168/24 on the oppidan firewentire restraint this server. There is a one-to-one intercommunity among 10.1.2.3 and 22.214.171.124.
In a NAT place the firewentire obtain feel a consideration common to
Inside IP Internet IP
In a Carriage Harangue Translation (PAT) there is a many-to-one intercommunity. This is habitually interpretationd on a firewentire when a strengthening insufficiencys entire IP haranguees in its inside network to interpretation a separate IP harangue. Restraint stance, a assemblage may insufficiency entire PCs that browse the Internet to profession the corresponding IP harangue. The firewentire obtain be setup to interpretation PAT to end this. Restraint stance, insidely a assemblage has 200 workstations on the network 192.168.3.0/24 and it has a separate referableorious IP harangue of 126.96.36.199. The firewentire obtain configured so that entire workstations interpretation the separate IP harangue of 188.8.131.52 when browsing the Internet, each workstation obtain feel the corresponding IP harangue yet obtain interpretation a opposed carriage to opposediate each congress.
In a PAT place, the firewentire obtain feel a consideration that looks common to:
Inside IP Internet IP Carriage
192.168.3.10 184.108.40.206 5000
192.168.3.11 220.127.116.11 5001