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A little bit of theory
Authored by: Bottacco on Feb 05, '03 11:41:54AM

Private address space (192.168.x.x , 10.x.x.x and 172.16.x.x) is termed as non routable- non Internet enabled and is defined by RFC 1918. That RFC prohibits addresses in those blocks from being seen in the Internet, either as source or destination addresses. That RFC also requires that addresses in those blocks be filtered at the edges of networks. Some providers and enterprises do this filtering, some don't, but in any case, routes for those destinations will never be found in the Internet.

If you are using one of those addresses as the local address on your computer, unless you are doing NAT or something similar to translate that address into something that is allowed on the Internet, the network will not know how to send traffic back to you. These addresses were intended only for local use within your network, not outside of it.

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