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## 8. ISDN

I am including this although this has nothing to do with qmail or mh. But without a PPP line to your ISP there is no email at all. I had quite a bit of bother to get my ISDN working. The SusE distribution includes a configuration for ISDN, but I wanted something simpler. The stuff here was adapted from Bernhard Hailer's scripts. (Vielen, vielen dank!)

The following rc.config loads the necessary modules during initialisation:

> `

>     #!/bin/bash
>     # This is adapted Bernhard Hailer's old script

>     LOCAL_NUMBER="91311234"        # tel no. 091311234
>     REMOTE_NUMBER="0911123456"     # ISP tel no.
>     LOCAL_IP="192.168.0.99"        # I have dynamic IP so this will do
>     REMOTE_IP="195.112.123.11"     # your ISP's gateway
>     DEVICE="ippp0"

>     SYSPATH="/sbin"
>     ISDNCTRL="$SYSPATH/isdnctrl"

>     case "$1" in
>     start)
>             # turn on isdn
>             insmod /lib/modules/2.0.33/net/slhc.o
>             insmod /lib/modules/2.0.33/misc/isdn.o
>             sleep 1
>             # load the hisax module
>             insmod /lib/modules/2.0.33/misc/hisax.o
>                                        id=Tel0 type=5 protocol=2 irq=10 io=0x300
>             echo "starting isdn4linux"
>             # global
>             $ISDNCTRL verbose 0

>             $ISDNCTRL addif $DEVICE         # create new interface
>             $ISDNCTRL addphone $DEVICE in $REMOTE_NUMBER
>             $ISDNCTRL addphone $DEVICE out $REMOTE_NUMBER
>             $ISDNCTRL eaz $DEVICE $LOCAL_NUMBER
>             $ISDNCTRL l2_prot $DEVICE hdlc
>             $ISDNCTRL l3_prot $DEVICE trans
>             $ISDNCTRL encap $DEVICE syncppp
>             $ISDNCTRL huptimeout $DEVICE 300
>             $ISDNCTRL chargehup  $DEVICE off
>             $ISDNCTRL secure $DEVICE on

>             $SYSPATH/ifconfig $DEVICE $LOCAL_IP pointopoint $REMOTE_IP metric 1
>             $SYSPATH/route add default $DEVICE
>             $SYSPATH/ipppd /dev/ippp0 file /etc/ppp/options.ipppd &
>             $SYSPATH/route del default

>             ;;
>     stop)
>             #turn off isdn
>             rmmod hisax.o
>             sleep 1
>             rmmod isdn.o
>             rmmod slhc.o
>             echo "Shutting down isdn4linux"
>             $ISDNCTRL delif ippp0
>             ;;
>     *)
>             echo "Usage: $0 (start|stop)"
>             exit 1
>             ;;
>     esac

> `

I use the following script to dial out, it is called simply isdn on|off

> `

>     #!/bin/bash
>     # This is based on an old script from Bernhard Hailer

>     IP_ADDRESS="195.112.123.11"

>     case "$1" in
>     on)

>             echo "Calling ippp0"
>             /sbin/isdnctrl dial ippp0
>     # the sleep is important as it gives the PPP time to settle down
>             echo "Sleep for 8s for PPP handshake"
>             sleep 8s
>             /sbin/route add default ippp0
>             echo "line open - checking...."

>     # check whether PPP negotiation was successful:
>             set `ping -qc3 -i1 $IP_ADDRESS 2>/dev/null | grep transmitted`
>             if [ $4 -gt 0 ];
>             then
>                     echo "succeeded."
>                     echo "Starting fetchmail daemon"
>                     /usr/bin/fetchmail -d 600 -k -v -a -L /var/log/fetchmail
>                     echo "Flushing mail queue...."
>                     /usr/local/bin/serialmail/maildir2smtp
>                                 ~alias/pppdir alias-ppp- mail.server.ip.no `hostname`
>             else
>                     echo "failed!"
>                     /sbin/isdnctrl hangup ippp0
>             fi

>     ;;

>     off)
>                     echo -n "Shutting down fetchmail daemon"
>                     /usr/bin/fetchmail --quit

>                     /sbin/isdnctrl hangup ippp0
>                     /sbin/route del default         # and delete route
>                     echo "You're off line"
>     ;;

>     *)
>             echo -e "\aUsage:"
>             echo "isdn on"
>             echo "isdn off"
>     ;;

>     esac

> `

The next lot is the ipppd options file /etc/ppp/options.ipppd

> `

>     # Based on:
>     # Klaus Franken, kfr@suse.de
>     # Version: 27.08.97 (5.1)
>     #
>     # This file is copy by YaST from /etc/ppp/ioptions.YaST
>     #   to options.<device>

>     user "myuserid"

>     # my system name (only for CHAP!)
>     # name my_system_name

>     # accept IP addresses from peer
>     # use with dynamic IP
>     ipcp-accept-local
>     ipcp-accept-remote
>     noipdefault

>     # try to get IP address from interface
>     # option specific to ipppd (as opposed to pppd)
>     # use only with static IP
>     #useifip

>     # disable all header-compression
>     -vj
>     -vjccomp
>     -ac
>     -pc
>     -bsdcomp

>     # sometimes you need this:
>     #noccp

>     # max receive unit
>     mru 1524
>     # max transmit unit
>     mtu 1500

>     # If this machine is a server, force authentication by uncommenting one
>     # of the following. However, if this machine is a client, doing this will
>     # prevent a succesful connection! (message "peer refused to authenticate").
>     # So, only uncomment on a server.
>     # "+pap" / "+chap" NUR AKTIVIEREN, WENN DIES EIN SERVER IST!!!
>     #+pap
>     #+chap

>     # if you have problems with handshaking (no response for first
>     # lcp-package) try to decrease the retry-cycle. Default is 3 sec,
>     # try for example 2 sec:
>     # lcp-restart 2

> `

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