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IP address: What identification?

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tmtw4ut9rmmc4qj@jetable.com -  
 Kyepakowa -
Good evening,

If I browse the net, I have a "Public" IP address, like 91.xxx.xxx.xx. If I have a fixed IP with a modem-router, I have a "private" IP address like 192.xxx.x.xxx. And between the two, I have the router's IP 192.xxx.x.x, which is what we call the "Gateway" I think?

Well, I’m wondering why I’m always identified by my public address 91.xxx.xxx.xx, and not by the router's address (a Freebox modem-router version 5 for example) for instance?

That seems obvious, otherwise millions of people would have the same IP at the same time on the network, but I had understood that a router also serves to better protect against hackers, so that if you’re attacked it’s the router that takes the hit rather than the PC, and that the potential bad guys on the other side would initially see only the router's address?

But if any site like What is my ip? recognizes my public IP by default, I don’t see where the protection is?

I know the router’s mainly for address routing, but I was nonetheless curious.

Configuration: Medem-router Freebox version 5

5 answers

  1. Anonymous user
     
    hi
    it's simple .
    sites only know your public IP and it is the router that routes data from your machine 192.x.x.x by giving it as 91.x.x.x it's called a NAT server

    you can take a look here nat
    it's very explanatory
    2
  2. Anonymous user
     
    it's very simple

    suppose your PC has 192.168.0.10 and the Freebox is on the internet side (telephone line) 82.x.x.x
    the "pirate" wants to recover your ip to access your PC (because that's how it works when you put a server on your PC)

    he will only recover the address 82.x.x.x and since the espon/trojan installed on your PC which is 192.168.0.10 and not on your Freebox (router) it will never connect to your PC
    so security guaranteed

    ps: there are still some "powerful" pirates who can do the impossible but you have nothing to fear because they only attack large systems (businesses....), and even on the side of large systems there are network administrators and sophisticated equipment that fight these powerful ones
    1
  3. Laurent
     
    Hi,

    You confuse the local IP address with the IP address your ISP provides you.

    Your internet IP address will never be 192.xxx.xxx.xxx, and by the way I think that address is even blocked on the internet; it is part of the banned addresses on the net, just like 128.0.0.1, etc.

    If you want a fixed IP address, your ISP must be compatible and you need to request it from them. The fixed address you think you have is the address of your local network.
    0
  4. tmtw4ut9rmmc4qj@jetable.com
     
    Hi,

    -No, no, I didn’t get confused, and I indeed have a static IP (It’s always the case in an unbundled area when your ISP is Free), like 89.xxx.xxx.xx, which is therefore my so-called public address if I don’t mess things up.

    Then I gave my PC a private address like 192.168.0.2 (And incidentally disabled DHCP).

    Finally I have the router’s IP 192.168.0.xxx, the gateway if I’m not mistaken.

    -Well I don’t understand how the router improves my security if, anyway, it’s my public IP that we see everywhere I go?

    That is to say I don’t understand what I read on this page, where it’s clearly stated:

    ... This feature also helps to better secure your computer system... Your computer will therefore no longer be “visible” on the Internet under its real address; a hacker would only be able to "see" the Freebox’s address. It all seriously complicates things for all the scoundrels who scour the web...

    But my real address, public (And fixed too), is constantly visible!

    So what exactly is it?

    And thank you for replying.
    0
  6. Kyepakowa
     
    Thank you metalismail, things are starting to become clearer for me!

    So just to be sure I understood correctly:

    - A pirate, who will only see my public IP address 91.xxx.xxx.xx, will only be able to install spyware or a Trojan horse on my PC with a private IP address like 192.168.0.2; and since the malware isn’t installed on the gateway/router with an address like 192.168.0.1, the Trojan or other malware won’t be able to connect to the Internet, so that’s the security, right?

    - Also I hope they only target the big system, because besides properly configuring my firewall, for example, I don’t have much knowledge on this topic.

    Anyway, thanks for your reply.
    0