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A reader wrote me to ask about IP address security. I’m not really sure whether he meant keeping his IP address a secret, or whether he was asking if someone could break into his network and use his ISP connection with his IP address, so, let’s first look at the idea of keeping one’s IP [...]

The simplest way to set up a home network, including both computers with wired connections and computers with wireless connections, is to set up a wireless router immediately following your DSL modem or Cable modem. Sometimes, a DSL modem even has the router built into it.
In this setup, all the computers are assigned their IP [...]