Netopia 4752, Administration Manual

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2-2 Administration Guide
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Custom domain name
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Multiple e-mail addresses
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Web site hosting
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Compare pricing, ser vice, and technical suppor t ser vice among various ISPs.
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Consider recommendations from colleagues and reviews in publications. Netopia lists Netopia Cer tified ISPs on
our Web site at
http://www.netopia.com .
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Your ISP may offer various Internet access account plans. Typically, these plans var y by usage charges and the
number of host IP addresses supplied. Evaluate your networking needs and discuss them with your ISP before
deciding on a plan for your network.
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Check whether your ISP has the Netopia 4752 on its list of suppor ted products that have been tested with a
par ticular configuration. If the ISP does not have the Netopia 4752 on such a list, describe the Netopia 4752 in
as much detail as needed, so your ISP account can be optimized. As appropriate, refer your ISP to Netopia’s
Web site www.netopia.com for more information.
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Typically, each network computer that requires Internet access requires its own unique IP address. If some or
all network computers require simultaneous Internet access, obtain a block of IP host addresses large enough
for each computer to have its own address, plus one for the Netopia 4752.
Consider expected growth in your network when deciding on the number of addresses to obtain. Alternatively,
you can use the Network Address Translation feature of Smar tIP.
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The Netopia 4752 SDSL Integrated Access Device suppor ts Multiple Network Address Translation (MultiNAT).
Network Address Translation provides Internet access to the network connected to the Netopia 4752 using only
a single IP address. These routers translate between the internal or local area network (LAN) addresses and a
single external IP address, and route accordingly. MultiNAT is a means of mapping one or more IP addresses
and/or IP ser vice por ts into different values.
This mapping ser ves two functions:
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It allows the addresses of many computers on a LAN to be represented to the public Internet by only one or
a few addresses, saving you money.
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It can be used as a security feature by obscuring the true addresses of impor tant machines from potential
hackers on the Internet.
For more information on Network Address Translation, see Chapter 11, “Multiple Network Address Translation.”