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- Newsgroups: comp.protocols.ppp
- Path: sparky!uunet!wupost!darwin.sura.net!Sirius.dfn.de!chx400!bernina!feigin
- From: feigin@iis.ethz.ch (Adam W. Feigin)
- Subject: Re: req for advice on using PPP
- Message-ID: <feigin.714204079@err>
- Sender: news@bernina.ethz.ch (USENET News System)
- Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH
- References: <Bt73Ap.2H4@news.fai.com>
- Distribution: na
- Date: Wed, 19 Aug 1992 06:01:19 GMT
- Lines: 64
-
- susanh@ossi.com (Susan Hunts) writes:
-
- >1. Is this a reasonable approach? Any major drawbacks I should know
- > about? What kind of performance am I likely to see? Any
- > problems with the PPP software and SunOS 4.1.1?
-
- Yes it is reasonable. I've run PPP between my Sparcstation at home
- (SunOS 4.1.1 and 4.1.2) and our campus net, mainly through a Telebit
- Netblazer, but another Sparcstation will work just fine. What do you
- mean by "performance" ? 'Interactive' (telnet, ftp)performance between
- 2 V.32bis modems is quite good, although sometimes you do notice
- you're not on a 10MB/s ether..
-
- >2. Does building, installing, configuring, etc. require a guru? The
- > PPP software appears to have nice, clear cookbook instructions
- > which can be followed by a neophyte. Any additional hints or tips
- > someone would like to pass on? What about setting up the modems?
-
- Building and installing it doesn't require guru status (although it
- certainly doesn't hurt :-} ), as the instructions are pretty clear. I
- think there was a file that needed to be copied into /usr/include
- somewhere that the instructions didn't mention.
-
- If you're going to be running NFS over the link, I'd recommend turning
- on UDP checksumming in your kernels (Its OFF by default in SunOS 4.x):
-
- gonzo csh[42]:adb -k /vmunix /dev/mem
- physmem 1bf3
- udp_cksum?
- _udp_cksum:
- _udp_cksum: 0 = unimp 0x0
- udp_cksum/w 1
- _udp_cksum: 0x0 = 0x1
- $q
-
-
- using a '?' instead of '/' will change the value both in the running
- kernel and /vmunix on disk. If you use the '/', it only gets changed
- in the running kernel, and will be set back to 0 when you reboot. If
- you want to generate new kernels with udp checksumming turned on, you
- can change /usr/sys/`arch`/OBJ/udp_usrreq.o with the adb in the same manner.
-
- >3. Any comments on choice of modems? (Cost is a factor.) If there's
- > a random modem available for free, what minimum capability should
- > it have?
-
- Go for the highest speed modems you can. There is a noticeable
- difference between V.32 (9600) and V.32bis (14400), at least in terms
- of how fast the link 'feels'. So, at a minimum, make sure you have
- V.32. I dont know how/if MNP/compression helps. Perhaps someone here
- has done some testing in this area ? I dont think you'd want to run NFS over
- anything slower than a 9600 baud link....
-
- /AWF
- ------------------------------------------------------------------------------
- Internet: feigin@iis.ethz.ch Adam W. Feigin
- UUCP:{backbones}!iis!feigin Network Systems Manager
- Mail: Integrated Systems Laboratory Institute for Integrated Systems
- ETH-Zentrum Swiss Federal Institute of Technology
- CH-8092 Zurich Zurich, Switzerland
- Switzerland
- Phone: +41 1 256 50 53
-
- "In Confession, you blame yourself, in analysis, you blame everyone else"
-