PPP up and down scripts

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From - Sat Oct  2 12:14:10 1999
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From: "Brian K. White" <linut@squonk.net>
Newsgroups: comp.unix.sco.misc
Subject: Re: Help in configuring "simple" DNS on SCO OSR 5.0.4
Date: Sat, 02 Oct 1999 07:50:09 -0400
Organization: Albany Burner Control
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References: <37f59992.776138@news.concentric.net> 
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RP wrote:
> 
> Running SCO Open Server 5.0.4p on  a single IBM PC.  Have used Tony
> Lawrence's sample scripts "up," and "down" to establish dial-up PPP
> connection to my ISP (concentric.net DNS 207.155.184.72 and
> 206.173.119.72, local and host address assigned dynamically by ISP).
> The connection is fine, I can ping the ISP using the numeric host
> address, but cannot figure out how to use the ISP DNS servers, so I
> can browse with Netscape Navigator.
> I don't have or need any networking other than this WAN connection to
> the ISP, and therefore don't need DNS on my computer.
> 
> My /etc/resolv.conf file contains:
> domain concentric.net
> nameserver 207.155.184.72
> nameserver 206.173.119.72
> (Yes, the DNS addresses are correct.)
> 
> My /etc/hosts file contains:
> localhost 127.0.0.1
> (I don't know how to reference concentric.net, since this is assigned
> dynamically, after the connection is established.)
> 
> I don't use named.boot, since there is no DNS on my box.
> 
> Any help, other than "man ifconfig, routed, named, resolv.conf,
> gated,"  etc appreciated. I have tried making sense of the above "man"
> entries  repeatedly without success.
> 
> Thanks,
> 
> --Ray Petkus <rpetkus@ibm.net>

I added the following to my up/down script for ppp:

 route add default `ifconfig $PPP 2>/dev/null |grep inet |cut -d" " -f2
`
just after the connection test succeeds, and
 route flush >/dev/null
just after bringing the connection down

here is my whole script. I call it "isp up" or "isp down" and it prints
the most basic of status info while it's working, and you know it's done
when the prompt comes back. (whereas pppattach doesn't inform you of
it's success or failure)
It's basically Tony's up & down scripts combined and with an automatic
default route maker inserted

you may need to change the -f2 in the "defgate" function to -f4, I have
my default gateway set to the other end of my PPP connection, but I've
also seen references and tested it myself, where the default gateway
should be whatever own IP is after connection. I think it depends on
your ISP, their implementation of PPP, and probably 23 things about your
own box that I don't know enough to talk about :)

btw, if you do the math re: WAIT x RETRY in this script you will see I
have it set to a very long time, this is becaues pppattach or uucp
underneath it, redials automatically and invisibly at least for me when
it fails to connect, so I made the testing phase long enough to account
for 2 or three Busy signal / retry cycles. but it checks every 5
seconds, so the script completes and exits as soon as a connection is
up.  

--
Brian~
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#!/bin/sh
# isp - raises and lowers PPP connection to ISP. linut@squonk.net
# usage: isp up    - connects to ISP
#        isp down  _ disconnects from ISP
# Derived from  /Unixart/quickppp.html

ISPNAME=squonk          # connection name used in cu and uucp config files
GATEWAY=                # default gateway address (blank for auto) 
WAIT=5                  # delay in seconds between connection tests
RETRY=45                # number of times to test connection before giving up
PPP=ppp0                # interface to use
DEBUG=                  # diagnostic messages 1=on blank=off

###############################################################################

#find out the default gateway
defgate () { [ $GATEWAY ] && echo $GATEWAY || ifconfig $PPP 2>/dev/null |grep inet |cut -d" " -f2 ; }

case "$1" in
    up)
        TC=0
        # ifconfig $PPP >/dev/null 2>&1 && $0 down
        [ $DEBUG ] && echo "$0: Connecting to \"$ISPNAME\""
        pppattach $ISPNAME >/dev/null
        while [ $TC != $RETRY ]
        do
        ifconfig $PPP >/dev/null 2>&1 && {
            route add default `defgate` >/dev/null
            echo "$0: Connected to \"$ISPNAME\""
            [ $DEBUG ] && echo -n "$(($TC*$WAIT)) seconds.\n$0: "
            [ $DEBUG ] && netstat -r
            exit 0
        }
        TC=$(($TC+1))
        sleep $WAIT
        done
        echo "$0: Failed to connect to \"$ISPNAME\" after $(($TC*$WAIT)) seconds."
        exit 1
    ;;
    down)
        [ $DEBUG ] && echo "$0: Disconnecting from \"$ISPNAME\" (`defgate`) "
        ifconfig $PPP down 2>/dev/null
        route flush >/dev/null
        echo "$0: Disconneced from \"$ISPNAME\""
        [ $DEBUG ] && netstat -r
    ;;
    test)
        ifconfig $PPP >/dev/null 2>&1 && echo "Device $PPP is UP (`ifconfig $PPP 2>/dev/null |grep inet |cut -d" " -f2,3,4 `)" || echo "Device $PPP is DOWN"
    ;;
    *)
        echo "$0: usage: $0 up|down|test"
    ;;
esac

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