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CDPD is based on early Mobile IP work, and thus resembles but does
not exactly match Mobile IP. In particular, the triangular routing
mobility approach is essentially the same in both CDPD and Mobile IP.
The following enumerates major areas of design differences between
the two approaches:
- The user's IP address must be assigned by the CDPD service
provider. Mobile IP makes no such assumptions.
- Mobile IP allows for co-location of mobile node and the foreign
agent. Combining the M-ES and the Serving MD-IS was not
considered and is not practical in CDPD.
- CDPD's mobility tunnel is based on CLNP. Mobile IP's mobility
tunnel is IP-based.
- Mobile IP is a pure IP design. CDPD is a multiprotocol design.
- Mobile IP operates completely above the data link layer. CDPD
mobility is mostly above the data link layer.
- Since the infrastructure of the CDPD network is closed there are
less security considerations for CDPD.