|
|
|
|
|
|
|
General IAS-1002 Only How does the IAS-1001/1002 give everyone on a network Internet Access using 1 dial-up account and 1 IP address? The IAS uses a technology called NAT (Network Address Translation) (Sometimes called IP Address Masquerading) to let everyone on your network use one IP address given to you by your ISP (Internet Service Provider). This technology is also a firewall in itself. How does it work? Every IP address on the Internet is a Registered or Legal IP address. Therefore no two IP addresses on the Internet are the same. For you to use the IAS to access the Internet you need one of these registered IP address from your ISP (Internet Service Provider). On your private Intranet or LAN, the IP addresses of your computers are probably unregistered or "illegal" IP addresses. When clients on your network start surfing the Internet, the IAS will receive all the requests for information. The IAS will dial-up your ISP and will give your IAS a registered legal IP address. Your IAS then uses that IP address to ask for all that requested information saying, " Send all information back to me at this IP address." So in essence it looks like all your network client’s requests are coming from that one IP address (Hence the name IP masquerading). When all that information comes back to the IAS, it will then sort the data using an Address Translation Table and give the data to the computer on your network that requested it. In regards to the firewall, what happens if someone on the Internet tries to access your network via the IAS? Nothing! There’s nothing there but the IAS which will not reverse translate unless you have allowed it by using the Virtual Server function.
Besides the IAS-1001/IAS-1002 what else do I need to provide all of the computers in my office with Internet Access?
Can I use the IAS-1001/IAS-1002 with an ISDN TA? Yes. The IAS-1001/IAS-1002 can support ISDN TAs. The DTE speed of the IAS-1001/1002 is 460Kbps. This speed can easily support two ISDN TAs. How many users can the IAS-1001/1002 support? The IAS-1001/IAS-1002 can support up to 253 clients on your LAN. In terms of simultaneous access the IAS-1001/IAS-1002 can support up to 32 simultaneous users. What is the difference between the IAS-1001/IAS-1002 and a router? The IAS-1001/IAS-1002 unlike a router does not require an expensive Class-C IP address. Both the IAS-1001/IAS-1002 can use any regular ISP dial-up account. Also, the IP address assigned by the ISP can be dynamic. How do I configure a IAS-1001/IAS-1002? The IAS-1001/IAS-1002 needs only be configured once using any Windows 95/NT computer on your network. After configuration, any computer on your network can then use the IAS-1001/IAS-1002 to surf the Internet, send E-mail or use other Internet applications. Does the IAS-1001/IAS-1002 work with leased lines? Yes, the IAS-1001/IAS-1002 works with asynchronous leased lines. When selecting your modem from the modem selection list in Setup Wizard select Leased Line Modem. It's that easy! Can I use a Macintosh or Windows 3.1 with the IAS-1001/IAS-1002? Yes. As long as TCP/IP protocol is installed on your computer, your Macs, Win3.1 computers and other operating systems will be able to use the IAS-1001/IAS-1002 to surf the Internet. Almost all operating systems now come with TCP/IP protocol included. Can I use a Macintosh or Windows 3.1 to configure the IAS-1001/IAS-1002? It is possible to configure the IAS-1001/IAS-1002 via terminal and remote configuration but it is more difficult. What does "Virtual Server" mean? Virtual Server is simply reverse NAT (Network Address Translation) from WAN to LAN. When you surf the Internet using NAT, you are using NAT from LAN to WAN. Everybody on your network is sharing one IP address. The IAS is "translating" your network client's internal IP addresses to the one IP address that you are sharing. Now what if someone on the outside (on the Internet) accesses that one IP address that you are all sharing. Usually nothing. The IAS will not usually translate the outside IP address to the inside IP address unless you tell it to do that in the Virtual Server section. How does the E-mail Server Work? The E-mail server is bundled
software which you install on a Windows 95 or NT computer on your network.
The one E-mail account that is given by your ISP can be separated by the
E-mail server. For example the ISP give you a regular ISP E-mail account:
sales@company.com as your E-mail address. You can then split it into "Name1"
<sales@company.com> , "Name2" <sales@company.com>, "Name3" <sales@company.com>,
etc…. If the ISP give you a Domain POP E-mail account: sales@company.com
as your E-mail address. You can then split it into name1@company.com,
name2@company.com, name3@company.com, etc....
What if I already have a DHCP server on my network? You should have only one DHCP server running on a network. The IAS-1001/IAS-1002 comes with the DHCP server already enabled. If you have another DHCP server on your network and wish to continue using it, you should turn off the DHCP server in your IAS-1001/1002. How do I get the DHCP server to assign a different gateway to my clients? The DHCP server by default will assign the IAS-1001/IAS-1002 as the default gateway. To have the DHCP server assign a different gateway you can set the routing table to: IP: 0.0.0.0
What does "Virtual Server" mean? Virtual Server is simply reverse NAT (Network Address Translation) from WAN to LAN. When you surf the Internet using NAT, you are using NAT from LAN to WAN. Everybody on your network is sharing one IP address. The IAS is "translating" your network client's internal IP addresses to the one IP address that you are sharing. Now what if someone on the outside (on the Internet) accesses that one IP address that you are all sharing. Usually nothing. The IAS will not usually translate the outside IP address to the inside IP address unless you tell it to do that in the Virtual Server section. How does the Virtual Server function work? To understand the virtual server function you must first understand how the IAS-1001/IAS-1002 uses NAT to provide Internet Access. The IAS-1001/IAS-1002 provides Internet access for your LAN with a complete NAT firewall. Click Here to find out how. If Joe Hacker on the Internet types in the IP address that was given to your IAS-1001/IAS-1002 by your ISP what happens? Nothing! The IAS-1001/IAS-1002 contains no information that he can access. The IAS-1001/IAS-1002 will not do a "Reverse translation" back onto a computer on your network. But what if you want to let Joe Hacker see specific access specific computers on your network. How do you do that? You use the IAS-1001/IAS-1002 virtual server function to setup a mapping where you "Map" the external IP address given to you by your ISP to the internal IP address that you want Internet users to be able to access. In the example below we have setup a mapping where the ISP has given us an IP address of 10 . 1 . 1 . 1 . We can set a mapping in the IAS-1001/IAS-1002 that says map the IP address 10 . 1 . 1 . 1 to an internal IP address on our network. The computer that we want Internet users to be able to access has an IP address of 172 . 16 . 1 . 1 . Can I use the IAS-1001/IAS-1002 to do LAN-to-LAN routing? The IAS-1001/IAS-1002 can do a pseudo LAN-to-LAN routing but not using the Network Neighborhood function in Windows 95/NT. Using the IAS-1001/IAS-1002 you set the IAS-1001/IAS-1002 to dial up a remote access server on your other network. All computers on your LAN can then use FTP, E-mail or other Internet applications to access servers on the other network. You can also use the virtual server function of the IAS-1001/IAS-1002 to allow computers on the remote network to access the local network's FTP, E-mail or other servers. IAS-1002 ONLY Does the IAS-1002 two port model require two ISP accounts? Unless your ISP allows multiple log-ins on one account, you will need a distinct ISP account for each modem port you use. If I have a IAS-1002, can I attach a modem to one of the serial ports and an ISDN TA to the other? Yes. Each port of the IAS-1002 is configured independently. Since a IAS-1002 has two modems, how does it decide which modem to use? You can configure the IAS-1002 to either use Load Balancing or ML-PPP. ML-PPP can bundle the two modem channels together to download a single web page. There are many other options to decide how your second modem will dial-up including Bandwidth-on-Demand. |
|
