motorola 5100e internet sharing question

can somene explain me how to share net on motorola 5100e?

can establish sharing by conecting 2 pc_s & modem to a switch without the router?

in user guide they tell to us that it can be 32 pc_s conected on a switch or hub and on it says after dhcp check box

Enable DHCP Server The SURFboard cable modem can be used as a gateway to the Internet by a maximum of 32 users on a Local Area Network (LAN). When the Cable Modem is disconnected from the Internet, users on the LAN can be dynamically assigned IP Addresses by the Cable Modem DHCP Server. These addresses are assigned from an address pool which begins with and ends with Statically assigned IP addresses for other devices on the LAN should be chosen from outside of this range


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You buy an extra ip address from your ISP. They program the 5100 to issue the second ip address.

Just buy a NAT route.

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Bit Twister

What they leave out is that while 32 is the maximum that the modem will handle, your provider probably doesn't. Since you're talking about the "e" model, I would assume that you're not in the US. In the US, most providers have added cost options to allow additional IP addresses, but usually not up to 32 on a residential account. Check with your provider about how much extra they charge for addtional IP addresses.

A broadband router would be a better idea. The ISP only knows one device (the router) is connected, and you can then use the router to manage your own LAN.

Basically what this is saying is that if your modem isn't connected to a cable internet provider's network, the modem will act as a DHCP server. You'd still need a hub or a switch to take advantage of this feature, as there aren't 32 ports available on the modem. Of course you could also use a router, but your typical home/soho router has it's own DHCP server, making this feature of the disconnected router redundant, and of no practical use.

So essentially, if you're looking to share your Internet connection, a broadband router connected to the modem is almost always the best option. Your cable modem is simply a bridge that modulates/demodulates between Ethernet and RF physical networks. Some modems are capable of more, but how much more is determined by your ISP, and they almost always are going to charge you extra if they even have a plan that enables additional capabilities.

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Key words: when the Cable Modem is *disconnected* from the Internet.

However, when the cable modem is connected to the internet, there is no DHCP function in the cable modem. When your computer requests an IP address from the cable modem, it passes the request through to the cable company CMTS. So multiple computers require multiple IP from the cable company.

Like others have suggested, go buy an inexpensive router and connect its WAN port to the cable modem. The router can process the DHCP request so every computer will have a local address such as 192.168.0.x. You will also gain some additional security features in the router such as NAT and SPI. If you buy a wireless router you have the option of either a wired or wireless connection to your various devices. The wireless routers are really a good deal right now because of the high number of units being produced compared to other types of network devices such as switches and wired routers.

Personally I like the Netgear WGR614 router and WG511 PC card adapter which are also bundled as a kit. Compared to the Linksys equivalents, the router has a nicer web interface, and the WG511 has better range due to a better chipset.

Sure, its an extra $100 or so but IMHO it is money well spent.

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