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Home » Forums » Forum Archives » Networking and Internet Sharing » Topic # 1158

DSL Internet Connection sharing
Bigdad Aug-29-01 02:22 AM
I have subscribed to AOL Plus DSL and I was wondering if the following devices I have purchased will allow for sharing the DSL connection on 3 computers I have:Linksys switched 10/100 Network in a box comes with, two Etherfast 10/100 LAN cards and I also purchased an extra LAN card, One Etherfast 10/100 5-Port Workgroup Switch, CAT5 cables and SYGATE Home Office software,I also was provided a USB DSL Actiontec modem, any suggestions? Many people I know in the gaming community would like to know so as to share this info with them. thank you for your time

1. RE: DSL Internet Connection sharing
lbyard Aug-29-01 03:20 PM
In response to message 0
I would take one of those switches back and get a router. Larry

There are few ways to share a broadband connection…. One is to purchase another IP address from your service provider. Most service providers charge a monthly fee for additional IPs. The best way is to purchase a broadband router such as the SMC Barricade (http://duxcw.com/digest/Reviews/Network/smc/smc7004br/smc7004br.htm). That is what I use. They cost about $100.
The Barricade has serial port for an external dial-up MODEM and a printer port and printer server. A printer can be connected to the Barricade and shared by computers on the local network. Not all printers will work with it. Many routers do not accommodate an Internet connection via an external dial-up MODEM and do not have printer port and server.
The Barricade can be connected to an Ethernet hub or switch hub can to expand the network and Internet sharing to more than the four PCs directly supported by the router.
There are also single port routers on the market, routers that do not include an Ethernet switch or hub (http://duxcw.com/faq/network/hubsw.htm). I will review one shortly.
Another way to do it is with a software solution. There are two flavors: a proxy server and a NAT (Network Address Translator). I have found that a NAT works best for a small network. Windows 98 Second Edition (SE) and Millennium (Me) include ICS (Internet Connection Sharing; http://duxcw.com/digest/Howto/network/win98se/intro.htm and http://duxcw.com/digest/Howto/network/win98se_cab/intro.htm). It works OK for basic browsing and E-Mail functions, but has problems with some network games and conferencing programs, etc. It requires two network adapters in the PC connected to the Internet, one to the MODEM and the other to another PC via a crossover cable (http://duxcw.com/digest/Howto/network/cable/cable1.htm) or to a hub with a straight-thru cable as you have now. You would have to buy another adapter and cable.
Of the software I have tested, I have found that SyGate (http://duxcw.com/digest/Reviews/Network/sygate/sygate.htm) is the best NAT (it can also function as a proxy). The version of SyGate I reviewed requires two network adapters like Win 98 SE/Me ICS. The newest version is advertised to work with one network adapter in the host computer (the one running the NAT).
With a software solution you must have the host computer on for the other computer(s) (clients) to use the Internet. Most routers are small boxes running a specialized server that performs both NAT and firewall functions. With a router, only the router has to be on. The router is also easier to install, is generally faster, and has fewer problems.

For an introduction to Ethernet hubs and switches and their differences, see “What is the difference between an Ethernet hub and switch?” at http://duxcw.com/faq/network/hubsw.htm.
Most broadband routers (“routers” for short) are a combination Ethernet switch (or hub) and Network Address Translator (NAT; see below). They usually include a Dynamic Host Configuration Protocol (DHCP) server (http://www.intel.com/support/landesk/configmgr/23099.htm#1), Domain Name Service (DNS) proxy server (see below), and a hardware firewall to protect the Local Area Network (LAN) from malicious intrusion from the Internet.
All routers have a Wide Area Network (WAN) Port. This port connects to the to a DSL or cable MODEM for broadband service (e.g., the Internet) and is usually a 10 MHz 10BASET Ethernet port. A 10 MHz WAN port is sufficient for cable and DSL MODEMs as these devices transfer data at rate that is a fraction of 10 MHz. I have seen no broadband routers with a USB WAN port to connect to a USB cable or DSL MODEM.
Many recent broadband routers are combination routers/Ethernet switch (or hub) that have multiple Ethernet ports to connect more than one PC to form a LAN. These ports allow the PCs to share the WAN port/broadband Internet connection and perform LAN functions, such as Windows file and printer sharing. The LAN ports are usually 100 MHz 100 BASE-TX Ethernet.
Some routers have a single WAN port and a single LAN port and are designed to connect to an existing LAN hub or switch to a WAN.
Ethernet switches and hubs can be connected to router with multiple PC ports to expand a LAN. Depending on the capabilities (kinds of available ports) of the router and the switches or hubs, the connection between the router and switches/hubs may require straight-thru or crossover cables (http://duxcw.com/digest/Howto/network/cable/cable1.htm). See “What is an uplink port and what are the ways to connect two hubs/switches together?” at http://duxcw.com/faq/network/uplink.htm for details.
Some routers have ports for USB connections to computers on a LAN. Some have wireless LAN capabilities.
In addition to a WAN port, broadband routers, such as the SMC Barricade routers (http://duxcw.com/digest/Reviews/Network/smc/smc7004br/smc7004br.htm), may have a serial port that can be connected to an external dial-up MODEM (useful as a backup for the cable of DSL service) and a built in LAN printer server and printer port.
A router DHCP server provides local Internet Protocol (IP) Addresses (http://support.microsoft.com/support/kb/articles/Q164/0/15.asp; e.g., 192.168.02, 192.168,.0.2,…) to PC’s, etc. on the LAN set to obtain their IP addresses automatically. These DHCP servers can usually be configured to allow assignment of static IP addresses to PCs and other devices on the LAN. A router-borne DNS proxy handles Internet name resolution requests form PCs on the LAN to the ISPs DNS servers to translate names of computers on the Internet to IP addresses (e.g., duxcw.com to 216.92.56.121). The NAT function in the broadband router allows sharing a single IP address provided by the Internet Service Provider with PCs connected directly to the router/switch or to hub or switch connected to the router by mapping local LAN IP addresses (assigned by the DHCP server or static IPs on the same TCP/IP subnet) to Internet IP addresses and vice versa and translating the address information in the TCP/IP protocol packets.
Besides the inherent protection features provided by the NAT, many routers have a built-in, configurable, hardware-based firewall. Firewall capabilities can range from the very basic to quite sophisticated. Among the capabilities found on leading routers are those that permit configuring TCP/UDP ports (http://www.iana.org/assignments/port-numbers) for games, chat services, and the like, and installing web servers, etc. on the LAN behind the firewall.
In short, a hub glues together an Ethernet network segment, a switch can connect multiple Ethernet segments, and a router can do those functions plus route TCP/IP packets between multiple PCs on LAN and a WAN, and much more.


2. RE: DSL Internet Connection sharing
Bigdad Aug-31-01 01:26 AM
In response to message 1
This is a home network with a single DSL connection with a DSL modem with a USB connector. The modem has a USB connection for transferring data to the computer. How would you possibly use a router between this USB modem connection and the computer? The modem was provided by the ISP service. Its what I have and how can I use it to share the 3 computers on a single IP account? The hardware I have is listed in my previous post. Could someone help me Please?

4. RE: DSL Internet Connection sharing
lbyard Aug-31-01 01:58 PM
In response to message 2
>How would you possibly use a router between this USB modem connection and the computer?

I know of no router that will accommodate a DSL or cable MODEM with a USB interface. Other ways to ways to share a broadband USB connection are listed in my last post, which came from our ICS FAQs. As a router is the best way to share the connection, the first thing I would suggest, if your service provider supplied the MODEM, would be to try to get your service provider to swap it for a MODEM with an Ethernet connection. Some of them will do that. It’s worth a phone call to find out. Some broadband MODEMs have both kinds of interfaces. If that is not an option, then you have to use a software solution as described in the post. Larry


5. RE: DSL Internet Connection sharing
bghool Jan-20-02 05:25 PM
In response to message 2
I have the same exact situation you do. I havent called AOL recently but have e-mailed them to see if i can get a different modem (had other questions in the email) but they did not respond to that particular question about the modem. There is a glimmer of hope though. There is a dsl modem that is suppose to be compatible with AOL that is connected through your NIC card. I have not done any homework on it but it is the Westell Wirespeed Ethernet DSL Modem. The only thing I know about it is that it cost around $300. I have downloaded an article about a guy networking his two computers with a USB modem thru AOL, but i dont know enough about networking to know if it would really work. He says it does. If interested let me know and i can email to you. barry

6. RE: DSL Internet Connection sharing
lbyard Jan-20-02 05:43 PM
In response to message 5
UPDATE: Now there is at least one router that will accomodate a USB broadband MODEM. See http://duxcw.com/faq/ics/dratek.htm for details. Larry

7. RE: DSL Internet Connection sharing
bghool Jan-21-02 10:53 PM
In response to message 6
I contacted them from daytek and they dont support the modem offered by AOL. Only two modems they support. If Bigdad called AOL and asked them, they will send him a differen modem that connects to the ethernet card. I just found that out. Its called Westell Wirespeed modem. Now i will be able to set up my netwok w/ a router..Thanks for this great website(Larry)...U the man!!!

8. RE: DSL Internet Connection sharing
lbyard Jan-21-02 11:23 PM
In response to message 7
Do you which two it supports? I'd like to update the FAQ so readers are informed before they purchase the Daytek router. Larry

9. RE: DSL Internet Connection sharing
bghool Jan-22-02 03:10 AM
In response to message 8
The only one i can remember is the Alcatel Speedtouch USB modem. They said they only support the Alcatel chipset whereas the Actiontec uses a Texas Instruments chipset...oh well

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