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Pcs and ip addresses


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Many local area networks use unroutable ranges of ip addresses such as 192.168.*.* or 10.*.*.*. On each local network however is a gateway machine which has a routable ip address visible to the internet, anyone on the local network appears to have the same ip address as far as the internet is concerned, some clever jiggery-pokery on the part of the gateway machine using 'port numbers' and translation tables make sure that replies back from the internet end up at the correct machine on the local network.

 

HTH

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If you were banned using an ip address then it wouldn't be the local 192.x.x.x address on your machine, it would be the internet facing ip address that is allocated by your isp.

Banning using ip address is a hammer for a nut though. To make it work you have to ban the range that the ISP allocates and that means that you are banning all users from a certain ISP (at least within a geographical area).

 

On a single network it's not allowed (although is possible) to have duplicate ip addresses, as the routers can't distinguish between the machines.

The internet can be thought of as a single network, individuals and companies then have their own networks that are seperate from the internet connected through a gateway, it doesn't matter if addresses on different networks are replicated as they aren't communicating directly.

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