If every device was exposed a hacker could use that information against said company.Figure 1-6 Sample LAN and WAN Connections The "*" means the node is not publicly identifiable. The lookup table keeps track of enough metrics to make sure each connection is correctly associated with the correct computer.
Now obviously it is not quite that simple since multiple users can use google at a time, but it is the basic concept. 192.168.1.10 requested so when responds the response goes back to that computer. The way it works is the router keeps a lookup table in memory. In terms of security, NAT is not a substitute for firewall or anything else those are still needed. NAT is also, partly, a security feature as no internet device can directly communicate with any devices behind the NAT on your network.
Given a limited number of internet IP's, NAT allows every home to use 1 internet IP to provide many internal IP addresses. If 192.168.71.19 is truly your IP you are already behind another NAT. It seems the missing component is NAT (Network Address Translation)ġ92.168.#.# is not routable across the internet. Right now i'm stuck at cable modem point, i have no clue how to built the rest of the structure. i'm using network simulation app, in this case i'm using cisco packet tracer to create every element that possible to built connection start from my local LAN (home) to the internal structure inside ISP until it reach the internet. I'm trying to create a simulation of node by node from my host until it reach the internet. The main goal, it's just for fun that i'm learning this. Anyone know what type of physical device should it connected to ? i guess the cable modem should connect to other router/switch but the weird thing i tried in app like 'cisco packet tracer', i'm not allowed to connect that cable modem to any router/switch. My big question, how is the structure inside the XX (logical network diagram) ? i mean at least the typical setup, not specific to my isp. I can't use traceroute, it will return nothing but '*'. I believe this XX is firewalled or forbidden by the ISP. It maybe a public IP or maybe another level of NAT before it reaches the public IP. From my PC i connect to the router and see the configuration (router administration page), i can see that the router got external-ip: 192.168.71.19 (255.255.255.0) and gateway: 192.168.71.1 (255.255.255.0). The last 2 nodes above (isp and internet) is the WAN. I'm trying to learn how the connection (LAN) is built in outer side of my home LAN. I'm not an IT guy, i'm just home user which know a bit about networking.
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