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170 lines
6.1 KiB
Plaintext
170 lines
6.1 KiB
Plaintext
I run PPP between crappie.morningstar.com (137.175.6.3, my home
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machine) and remora.morningstar.com (137.175.2.7, my workstation at
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the office). This document describes how I use it. The installation
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of PPP itself is covered in the PPP distribution.
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I put a line like this in remora's /etc/passwd:
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Pkarl:2y4613BDaQD3x:51:10:Karl's PPP login:/tmp:/usr/local/etc/pppstart
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I created a login shell script on remora called
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/usr/local/etc/pppstart:
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#!/bin/sh
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/usr/bin/mesg n
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stty -tostop
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exec /usr/local/etc/ppp 137.175.2.7:
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I use the ppp-on command to bring up a connection, and ppp-off to shut
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it down. These shell scripts, plus the unlock and fix-cua scripts and
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the source to the chat program are included. You will need to heavily
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modify these to suit your own situation, including Internet addresses,
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machine names, telephone numbers, modem dialing commands, baud rates,
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login names and passwords. Make the "ppp..." command in the ppp-on
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script look something like this:
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ppp 137.175.6.3: /dev/cua &
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The "137.175.6.3:" is of the format "local-addr:remote-addr" with the
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remote address null (it will be negotiated by PPP). Look at the login
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shell script above; it can be common to all dial-in PPP users on your
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machine because it only specifies the address of the remora
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(receiving) end of the link.
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If you use the enclosed chat and unlock programs, be sure they are
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suid uucp, and fix-cua should be suid root. The ppp-on script should
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be chmod 700, owner yourself, to keep the password (semi-) secure.
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I use the following eeprom settings and /dev and /etc/ttytab entries
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in order to support dial-in and dial-out on a single phone line:
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crappie 12% eeprom | grep ttya
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ttya-mode=19200,8,1,n,h
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ttya-rts-dtr-off=false
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ttya-ignore-cd=false
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crappie 13% ls -lg /dev/cua /dev/ttya
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crw-rw-rw- 1 root staff 12, 128 Nov 20 09:14 /dev/cua
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crw--w--w- 1 root wheel 12, 0 Nov 20 08:25 /dev/ttya
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crappie 14% grep ttya /etc/ttytab
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ttya "/usr/etc/getty std.19200" unknown on
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crappie 15%
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On SunOS 4.1 and later, make sure that the /etc/ttytab line for ttya
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doesn't say "local":
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ttya "/usr/etc/getty std.38400" unknown on
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Make sure your modem passes data transparently; watch out especially
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for ^S, ^Q, ^P (UUCP spoofing) and parity problems. I have a Telebit
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Trailblazer+ attached to /dev/ttya with the following register
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settings:
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aaatz
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OK
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aat&n
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E1 F1 M1 Q6 P V1 X0 Version BA4.00
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S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07=060 S08=002 S09=006
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S10=007 S11=070 S12=050
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S45=000 S47=004 S48=000 S49=000
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S50=000 S51=005 S52=002 S53=003 S54=001 S55=000 S56=017 S57=019 S58=002 S59=000
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S60=000 S61=000 S62=003 S63=001 S64=000 S65=000 S66=001 S67=000 S68=255
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S90=000 S91=000 S92=001 S95=000
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S100=000 S101=000 S102=000 S104=000
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S110=001 S111=030 S112=001
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S121=000
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N0:
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N1:
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N2:
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N3:
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N4:
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N5:
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N6:
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N7:
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N8:
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N9:
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OK
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And, the following entry is in /etc/gettytab:
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#
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# 19200/2400 dialin for Telebit Trailblazer+ modem
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#
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T|T19200:dial-19200:\
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:nx=T2400:sp#19200:
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T2400|dial-2400:\
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:nx=T19200:sp#2400:
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My chat script dialing command looks like "ATs50=255s111=0DT4515678"
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instead of just "ATDT4515678" in order to force a PEP mode connection
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and to disable the UUCP spoofing (otherwise, the modem swallows or
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delays ^P characters).
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I run /usr/etc/in.routed on crappie (the calling end) and have this in
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my /etc/gateways file:
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net 0.0.0.0 gateway remora metric 1 passive
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host crappie gateway crappie metric 0 passive
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Routed is started in /etc/rc.local. This way, I don't have to
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manually add or delete routes when links come up. I ifconfig the ppp0
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interface on crappie at boot time like this (in /etc/rc.local with the
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other ifconfig's):
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ifconfig ppp0 crappie remora netmask 0xffffff00 down
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I put "init ppp_attach" in my /sys/sun4c/conf/CRAPPIE file so that the
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above ifconfig down will work:
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pseudo-device ppp1 init ppp_attach # Point-to-Point Protocol, 1 line
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Routed now keeps my routes sane at the crappie.MorningStar.Com end.
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My ethernet (le0) and PPP (ppp0) interfaces are configured with the
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same address and netmask. IP is smart enough to figure out (via the
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routes in /etc/gateways) that everything useful needs to go out ppp0.
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Also, the remora end of my PPP link is configured the same way -- the
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ppp0 interface there is configured with the same address and netmask
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as remora's le0 ethernet. This means that separate interface names
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like "remora-ppp" are not needed; point-to-point links (whether PPP,
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Xerox Synchronous Point-to-Point Protocol, SLIP, IGP or whatever) have
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(apparently) been used this (seemingly bizarre) way for some time.
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This works because when IP looks at a POINTOPOINT link it ignores the
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local address (unlike an ethernet interface) and only looks at the
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remote address.
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Here's what netstat shows for me:
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crappie 109% netstat -r
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Routing tables
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Destination Gateway Flags Refcnt Use Interface
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localhost localhost UH 0 0 lo0
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crappie crappie UH 1 11339 le0
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default remora UG 0 1266 ppp0
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mstar-net-ppp-remora crappie U 0 0 le0
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crappie 110% netstat -rn
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Routing tables
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Destination Gateway Flags Refcnt Use Interface
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127.0.0.1 127.0.0.1 UH 0 0 lo0
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137.175.6.3 137.175.6.3 UH 1 11339 le0
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default 137.175.2.7 UG 0 1266 ppp0
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137.175.6.0 137.175.6.3 U 0 0 le0
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crappie 111%
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The default route to remora is a result of the first line in the
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/etc/gateways file ("default" can't be used there; you have to say
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"0.0.0.0").
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On the network at work, I add a static route in our gateway machine's
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/etc/rc.local file:
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/usr/etc/route add net 137.175.6 remora 1
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All the other machines in the office have default routes pointing at
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the gateway machine, and all PPP-connected external machines are on the
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137.175.6 subnet.
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Send me mail or post to the newsgroup comp.protocols.ppp if you have
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any questions.
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Karl Fox <karl@MorningStar.Com>
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