Broadband routers use Network Address Translation (NAT) to let multiple hosts share that one IP address assigned to the router's "WAN port." This is a typical configuration for wireless home networks, and is usually the easiest and most cost effective option.
However, some cable modems do support multiple IP-addressable devices. If your modem and cable provider both support this feature, you might be able to connect your AP directly to your cable modem's Ethernet port. Any station connected to your AP would become a separately addressed host, getting its IP address from your provider's DHCP server. Providers that support multiple IP addresses per cable drop usually charge extra for each IP address. For example, my cable provider charges $5 per month for leasing a second IP address. You would need at least three IP addresses: one for your wireless AP, one for your existing PC, and one for your wireless card. Caveat: I have never tried this configuration myself, but I think it's conceptually possible, given a cooperative cable modem and cable provider.
Dig Deeper on Wireless LAN (WLAN)
The second is a wireless Linksys router that my home PCs will use in a wired state with DHCP addressing (the default IP address of the router).
I tried connecting both routers to a hub and the hub to the cable modem. The VPN worked, but the home network didn't (though when I
ipconfig the address, the reply is what I would expect based on the Linksys router's IP address). Can this be done and how? Thanks.
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