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8.4.7
NAPT and STWireless Transparency
NAPT and STWireless
transparency
In this subsection
Consequences of NAPT
on layers
3EC 17766 AAAA TCZZA Ed. 01
As described in subsection 8.4.6, the STWireless can perform
NAPT to decouple your local IP addresses from the public IP
address negotiated during a PPP session.
However, this feature comes at the expense of the STWireless
transparency. This because a number of protocols that are layered
on top of either TCP/IP , or UDP/IP do not adhere to the ISO/OSI
reference model.
Note: The ISO Open Systems Interconnection (OSI) reference
model promotes the layered implementation of communications
protocol stacks. Layers from protocol stacks implemented
according to this model can be changed without affecting the
upper or lower layers.
Consequences of NAPT on Layers
"
STWireless Solutions
"
ATMF 25
"
Via the PPPoA to PPTP Relay
"
PPP to DHCP Spoofing.
"
An important consequence is that changing IP addresses, or
TCP/UDP ports via NAPT affects the other layers as well.
Due to these changes, applications that are the ultimate
consumers of the protocols cannot decode the information
correctly anymore.
8 Data Services - PPP & IP Routing
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