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Internet IP Address Question

 
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xpression
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PostPosted: Mon Feb 13, 2006 10:03 pm    Post subject: Internet IP Address Question Reply with quote

this might take a bit of explaining so please bear with me.
you know how back in dial-up days your computer was assigned an IP address from your ISP, which is what people connected to u with for online games etc?

these days with routers and networks etc how does that work? obviously the router connects to the internet and gets an internet IP address, but the machines only seem to get a Local IP address. Is there a setting within routers to re-rout incomming connections to the WAN (internet) IP address to a designated machine or something? or am i way off the mark?
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Rapier
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PostPosted: Mon Feb 13, 2006 10:25 pm    Post subject: Reply with quote

yeah a router basically seperates lan and wan traffic. you get a local IP adress from your network card which normally conects through a network to your router (the exception being usb) your router modem has its own local ip adress and an ip adress given by your isp.

http://www.whatismyip.com/ this site will tell you what your ip address is

i regards to games etc, most good routers have NAT (network address translation) basically nat tells incoming WAN traffic where to go to your LAN, so for example if battlefield 1942 port for online gaming is 16784 (this is not is actual port) you will need to forward that port to your local IP address.

this is my SUA (single user access meaning can only forward 1 port to 1 local ip address at a time) NAT table



top is the range of ports many will be familiar with as its the general bit torrent range, i think the second one is actuallythe port for battlefiled 1942.

this has been explained poorly lol and is probably very confusing but just keep replying and ill keep trying to explain
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theblackone
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PostPosted: Mon Feb 13, 2006 11:12 pm    Post subject: Reply with quote

You get given a unique address. (210.25.54.200)

Say you have 2 computers in your house, these 2 computers will need addresses to be used to indentify them.
The router uses private ip addresses (which are a range of ip addresses that a reserved and not used at all publically... only locally)
so say your machine's ip address is 192.168.10.10 and ur other is 192.168.168.10.12. To the outside world, the address 210.25.54.200 is seen as ONE computer.. but in fact it could be many (due to the public addressing)

The router basically TRANSLATES these addresses.
So if someone from a computer sends some info to you, they will send it to 210.25.54.200 and the router will then translate the address into the Private Ip address.

WAN to LAN Public Ip Address 210.***----> ROUTER ---> Private Ip Address 192.168.10.10

LAN to WAN Private Ip Address 192.168.10.10 ---> ROUTER ---> Public IP Address 210.*.*.*

So basically u are correct...as Routers do all that work and most of them come pre programmed and of course you can re program it to suit your needs.


If you still dont understand POST what your not sure of..
cheers
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xpression
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PostPosted: Wed Feb 15, 2006 9:08 pm    Post subject: Reply with quote

yeh i think NAT is the answer. thanks guys
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