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- Newsgroups: comp.protocols.ppp
- Path: sparky!uunet!kithrup!stanford.edu!agate!ames!elroy.jpl.nasa.gov!sdd.hp.com!hpscdc!cupnews0.cup.hp.com!hppad.waterloo.hp.com!rypma
- From: rypma@waterloo.hp.com (Ted Rypma)
- Subject: Re: Why is PPP better than SLIP
- Sender: news@waterloo.hp.com (NetNews)
- Message-ID: <Bts3MI.FI@waterloo.hp.com>
- Date: Sun, 30 Aug 1992 04:11:05 GMT
- References: <BOB.92Aug27180314@volitans.MorningStar.Com>
- Organization: HP Panacom Div Waterloo ON Canada
- X-Newsreader: Tin 1.1.3 PL5
- Lines: 33
-
- Bob Sutterfield (bob@MorningStar.Com) wrote:
- :
- : "... speedwise PPP could translate into a tenfold improvement over
- : SLIP"
- :
- : Actually, that's attributed to someone from HDS, a company that
- : recently started shipping "its own version of PPP" with its X
- : terminals. The article says they started shipping PPP "after rigorous
- : performance testing of PPP and SLIP," but I haven't been able to
- : reproduce their results.
- :
- : NOW is that really true. I mean I thought I was getting almost all
- : I could bet from my POTS line using SLIP. Can it really be true
- : that PPP is really that much superior to SLIP?
- :
- : That's marketing hype. Don't believe it. They're constrained, like
- : everyone else, by (1) the amount of user data that must traverse the
- : link, and (2) current modem technology. Since it's the same amount of
- : user data, and since they're presumably using the same type modem,
- : there's no difference between PPP and SLIP.
-
- I suspect that they are mixing apples and oranges in the package. What HDS
- was probably referring to was an X protocol speed improvement, which they
- probably got by both using Van Jacobson's header compression to get 40
- byte IP/TCP headers down to 5 or 6 bytes AND compressing the average 32 byte
- short X protocol request/reply down to 5 or 6 bytes.
-
- That IS 10-fold; 5 x for each "header". But nothing to do with PPP vs SLIP
- without header compression.
-
- Ted Rypma
- HP Panacom Division
- (A happy user of X over CSLIP at 38.4 Kbps)
-