Netopia 6.3 - Manual (Page 53)

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Section 4 Configure
What types of servers are supported by IPMaps?
IPMaps allows a Cayman Gateway to support servers behind the Gateway,
for example, web, mail, FTP, or DNS servers. VPN servers are not supported
at this time.
Can I use IPMaps with my PPPoE or PPPoA connection?
Yes. IPMaps can be assigned to the WAN interface provided they are on
the same subnet. Service providers will need to ensure proper routing to
all IP addresses assigned to your WAN interface.
Will IPMaps allow IP addresses from different subnets to be assigned to my
Gateway?
IPMap will support statically assigned WAN IP addresses from the same
subnet.
WAN IP addresses from different subnets are not supported.