hey man if NAT and PAT didn't exist what could shortcomings be ?

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hey man , i returned ... i spend my time by researching ip subjects about thesis...
it is too hard to do..

question :

NAT/PAT is used to match one or more private addresses to a public address. (you know)

my main purpose to ask that think about you have 5 end devices (PCs) at home
but only one modem and these PCs want to connect to internet.

by using PAT we could get them to internet but if PAT didn't exist what could solution be?


as far as i know if we use NAT/PAT source address is not considered our private address
but the local address of gateway am i wrong?

 

you mean , in that position everybody at that home would have to acquire a public address
and also their local network becomes visible to outside and ip address depletion
speed would increase ?

and with NAT/PAT local address of our modem or modem-like device is visible to
outside not our private ip OK ?

 

is my sentence true below

"as far as i know if we use NAT/PAT source address is not considered our private address
but the local address of gateway am i wrong?"


and if NAT is not used , for the security would IPsec or VPN be got to it ?

 

at that time in which conditions is ipsec used? ...

and

if we use NAT what could be taken as source the local address of gateway or public side of it?

and i ask the same for IPsec ? i suppose that source is the real source

 

hey i found this for NAT : "NAT also adds to security as it disguises the internal network's structure: all traffic appears to outside parties as if it originates from the gateway machine."

i know this but due to this fact (about NAT) ; the local side of gateway is the source or public side ?

................
and for ipsec , all data is encrypted so unwanted traffic can not interfere ...
but still can't comprehend why is ipsec not used at a NATted device?

and about ipsec , source is the real originating device

 

i know this but due to this fact (about NAT) ; the local side of gateway is the source or public side ?

and about ipsec , source is the real originating device?

 

no , i didn't mention the thing you said...

in NAT , source is not the end device source is the outsider device?

in ipsec , source is the end device?