🚀 go-pugleaf

In <1993Oct06.073918.3279@sarnode.saratov.su>, Superuser - Rashid Karimov (root@sarnode.saratov.su) wrote:
: 	IMHO these two are rather different protos. PPP uses different proce-
: 	ssing on outgoing/incoming IP datagramm. It uses so called HDLC driver.
: 	The next difference in user interface. PPP uses PPPD - PPP daemon,wich
: 	waits for connection requests from PPP , establish it by running
: 	UUCP style calling & login script & finally put PPP module under IP
: 	to allow them to send datagramms.

There is nothing which prevents using dial-on-demand SLIP. In this
sense SLIP is not worse than PPP.

The *real* advantages of PPP over SLIP are:

- PPP can carry packets from different protocols (IP, OSI, AppleTalk etc)
  over a single link. SLIP is IP only.
- PPP has a mechanism for avoiding sending control characters on
  async. links. With SLIP you must have completely transparent link.
- PPP adds link-level checksums which make it possible to use
  Van-Jacobson TCP header compression on less-than-perfect links
  with no risk of getting user data corrupted.
- PPP can be used on async and sync lines; SLIP is async only.

Of course, it goes for a price of much more complex software. A typical
PPP implementation is about five times "fatter" than a SLIP driver.

: 	But, is PPP itself responsible for proper routing after establishing
: 	the PPP connection - this is a question !?

PPP has nothing to do with routing, it's only a protocol to provide
packet encapsulation on a point-to-point link.

: 	Suppose I have IP provider with IP 222.222.222.222 ,which  should be
: 	used as default route to outside world. How do I say to PPP to start
: 	connection to 222.222.222.222, when I want to make
: 	ftp sco.com ???

You don't have to say anything to PPP. A link has two IP addresses
at the ends and your host should have the address on remote end as
a gateway for default route.

: 	Should I use route add default 222.222.222.222 1 before it ?
: 	But phisycal interface doesn't exist this time yet ?

Yeah, sure.  Trash SCO and get a real system.  BSD for example.

: 	IMHO , as PPP stands for Point-to-Point, it doesn't allow use
: 	it for routing at all :(

You've got it completely wrong.

--vadim