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Raw IP does without the use of a protocol such as X.75 or HDLC
(for modem emulation, etc.) or PPP. TCP/IP packets are directly
exchanged.
Raw IP has both advantages and disadvantages.
Advantages:
- No handshaking (= faster connections)
- Authorization by Caller ID (= fast, safe, no password)
- Fixed IP address (= a broken connection can be continued by redialing)
- Higher data transfer rates
- Better stability (smaller driver = almost no bugs)
Disadvantages:
- No handshaking
=> Configuration must occur beforehand (IP addresses,...)
=> sensible to use for only for one provider at a time
- Authorization only by Caller ID
=> Dialin only possible from one's own number
- Fixed IP address
=> must be known ahead of time, more IP addresses required, no dynamic
assignment of addresses possible.
From this summary it should be clear under what conditions it makes sense
to use raw IP.
Raw IP can still be used with the new CAPI interface and drivers by using
ItunD, the ISDN tunnel Daemon. ItunD (ISDN tunnel Daemon)
provides a network tunnel over ISDN lines using the CAPI interface. The
ISDN4Linux isdn-net (raw IP) devices are supported.
You can find ItunD at:
http://sourceforge.net/projects/itund/
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