Multitech RF500S Uživatelský manuál stáhnout pdf (Strana 27)

7 Broadband Router – One Address So Many Computers

When the LAN was first set up we used proxy software

running on a laptop. This allowed multiple computers to

share a single ISP account. The software included a

DHCP server to automatically allocate IP addresses.

This was convenient and at the time a cost effective

solution, assuming one has a spare computer available.

Over time several shortcomings became apparent:

Each application must be configured to use the

proxy. This makes moving a laptop between LANs difficult. We wanted to replace Proxy with

NAT.

Streaming services such as Windows Media Player and Real Audio player do not work well

behind a proxy. NAT solves this problem.

Even though sharing software does a good job protecting PCs on the LAN the machine connected

to the Internet is vulnerable. If that machine is compromised the attacker has access to everything

on the LAN. To protect this PC I was running both the sharing software and a firewall. This was

fragile installing the latest Microsoft patches often broke the firewall.

When one factors in the total cost for software solution, extra NIC card, sharing software, firewall

very little difference exists between software and hardware solutions.

I wanted to be able to take advantage of high speed Internet connection and share it among all computers

just as we were doing with dialup. However, I was also aware of the DSL horror stories so I wanted to set

up a system that could do automatic fallback to dialup. This minimizes the chance of losing all Internet

connectivity.

Router requirements:

Ethernet port for DSL

RS232 Serial port for dialup modem

Automatic fallback to analog modem if broadband fails

NAT support using single public IP address

4 port 10/100 Ethernet Switch

DHCP server for LAN addresses

Dynamic and static IP address assignment on LAN

IPsec pass through for VPN (that came later)

Good tech support

The device I finally purchased was the MultiTech RF500S. I’ve been very pleased with the choice. It

meets our entire technical requirement and technical support has been outstanding.

7.1 DSL Interface

DSL providers offer three types of modem, External Ethernet, External USB, Internal PCI. There are pros

and cons to each. External Ethernet is the most flexible because it can be use with a single computer or a

router. PCI and USB must be directly connected to a PC.

The computer interface of the NetToNet network termination device is Ethernet. This connects directly to

the Wide Area Network (WAN) port of the router. My DSL service uses static IP addresses so

configuration was simple, entered DSL IP address, Subnet mask, and Gateway address. In the DNS section

I entered the addresses of the two DSL DNS server. Once those setting were entered and saved we were up

and running.

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