On Sun, 24 Nov 2013 20:40:21 +0100 David Keller
<[email protected]> wrote:
> Hello,
>
> ***************
> * My setup
>
> Say I have a router using pppoe to connect to internet.
> It gets a different ip address from the ISP every day.
>
> From this router I want to create a gif tunnel to a static-ip host.
>
> ***************
> * My problem
>
> How can I ensure the src outer address of the gif interface sticks to
> the pppoe dynamic-ip ?
>
> ***************
> * My solution
>
> I was thinking about updating the gif interface when the pppoe link
> changes its IP using a userland daemon
> which monitors the interface and executes user scripts.
>
> ***************
> * Your feeling
>
> 1) Is this a good idea ?
> 2) Does this daemon already exist ?
> 2.1) If I write it, would you like me to share it ?
>
> Regards,
>
> David
>
Here's how I do it:
#!/bin/sh
LastIP=0.0.0.0
Route=no
Tunnel=no
Dyndns=no
while true
do
CurrIP=`ifconfig pppoe0 |awk '/inet / {print $2}'`
#CurrIP=`ftp -o - 'http://www.meine-aktuelle-ip.de/' 2>/dev/null |sed -n
"s%^.*Ihre aktuelle IP Adresse: \(.*\)<br />.*$%\1%p"`
# Check validity of $CurrIP
ping -c1 -w1 -- "$CurrIP" 2>&1 >/dev/null || CurrIP=0.0.0.0
TunnelRemoteV4=`ifconfig gif0 |awk '/physical address inet / {print $6}'`
# Delete old route when dynamic IP has changed
if [ "$CurrIP" != "$LastIP" ]
then
if [ "$Route" = yes ]
then
route delete "$LastIP" localhost
fi
Route=no
Tunnel=no
Dyndns=no
fi
if [ "$CurrIP" != 0.0.0.0 ]
then
# Send mail only when something needs to be done
if [ "$Route" != yes -o "$Dyndns" != yes -o "$Tunnel" != yes ]
then
mail -s "`hostname` dynamic IP update to $CurrIP" root |&
exec 5>&p
echo "Current IP is $CurrIP" >&5
echo "Last IP was $LastIP" >&5
echo "Last status: $Route, Tunnel: $Tunnel, Dyndns: $Dyndns\n" >&5
echo >&5
else
exec 5>&2
fi
LastIP="$CurrIP"
if [ "$Route" != yes ]
then
echo -n "Adding route: " >&5
Reply=`route add "$CurrIP" localhost 2>/dev/null`
case "$Reply" in
"add host $CurrIP: gateway localhost")
echo "success - $Reply" >&5
Route=yes
;;
"add host $CurrIP: gateway localhost: File exists")
echo "success - $Reply" >&5
Route=yes
;;
*)
echo "failed - $Reply" >&5
Route=failed
;;
esac
fi
if [ "$Tunnel" != yes ]
then
echo -n "Adding tunnel: " >&5
if ifconfig gif0 tunnel "$CurrIP" "$TunnelRemoteV4"
then
echo success: >&5
ifconfig gif0 >&5
Tunnel=yes
else
echo failed. >&5
Tunnel=failed
fi
fi
if [ "$Dyndns" != yes ]
then
for URL in \
'http://ipv4.cloudns.net/api/dynamicURL/?q=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' \
'http://ipv4.cloudns.net/api/dynamicURL/?q=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' \
'http://ipv4.cloudns.net/api/dynamicURL/?q=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
do
echo >&5
echo "Updating ClouDNS \"$URL\"" >&5
Reply=`ftp -Vo - "$URL" 2>&1`
Dyndns=yes
case "$Reply" in
Updated*)
echo "success - $Reply" >&5
;;
OK)
echo "success - $Reply" >&5
;;
"ERROR:\ Address\ $CurrIP\ has\ not\ changed.")
echo "Not changed: $Reply" >&5
;;
ERROR*)
echo "$Reply" >&5
Dyndns=failed
;;
*)
echo "Unknown reply - $Reply" >&5
Dyndns=failed
;;
esac
done
fi
exec 5>&-
# Send heartbeat to IPv6 tunnel peer -needed every 60 seconds.
if [ -n "$TunnelRemoteV4" ]
then
# inspired by heartbeat script written by Oliver Walter <[email protected]>
Passphrase='XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'
RemoteV6='2001:4dd0:ff00:12a8::1'
LocalV6='2001:4dd0:ff00:12a8::2'
HB="HEARTBEAT TUNNEL $LocalV6 sender `date +%s`"
echo -n "$HB `echo -n "$HB" "$Passphrase" |md5`" \
|nc -w1 -u "$TunnelRemoteV4" 3740
fi
fi
sleep 55
done
also in /etc/daily.local I do
next_part "Force pppoe0 reconnect:"
ifconfig pppoe0 down
ifconfig pppoe0 up
# wait for reconnect
sleep 35
ifconfig pppoe0
Have fun!
Christopher
--
http://gmerlin.de
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