Netopia R2121, User Reference Manual

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Understanding IP Addressing C-9
In any situation where a device is dialing into a Netopia router, the router may need to be configured to ser ve IP
via the WAN inter face. This is only a requirement if the calling device has not been configured locally to know
what its address(es) are. So when a client, dialing into a Netopia router's WAN inter face, is expecting
addresses to be ser ved by the answering router, you must set the answering Netopia router to ser ve IP via its
WAN inter face.
You can do this in either of two ways:
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use the Ser ve Dynamic WAN Clients option in the Address Ser ving Setup screen.
Ser ve Dynamic WAN Clients enabled only allows you to specify a pool of addresses from which the dial-in
client may get an IP address. It does not allow static addressing.
If you want to ser ve addresses dynamically, use Ser ve Dynamic WAN Clients.
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define the address that you want to ser ve in the Connection Profile's IP Setup screen.
This method requires a static value to be used. Thus any user dialing in can obtain the same IP address for
ever y connection to the profile.
If you want to ser ve addresses statically, define the address in the Connection Profile.
Notes:
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The addresses that are to be ser ved cannot be used elsewhere. For example you wouldn't want to
define a static address in a Connection Profile to be ser ved via the WAN that is already defined in the
DHCP pool of addresses.
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In order to work correctly, you must define a “host” or “node” address in the IP Profile Parameters of
the Connection Profile.
This is accomplished by specifying the IP address that is to be statically ser ved via the WAN, and then
by entering a mask value of 255.255.255.255.
Tips and rules for distributing IP addresses
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Before you allocate IP addresses using DHCP and MacIP, consider whether you need to set aside any static
addresses.
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Note any planned and currently used static addresses before you use DHCP and MacIP.
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Avoid fragmenting your block of IP addresses. For example, tr y to use a continuous range for the static
addresses you choose.