/usr/local/sbin/control-dyn-dns.pl
/media/DATA-4T/DATA/Eigene_Dateien/EDV-Tel/Perld/dyn-dns-dtdns/control-dyn-dns.pl


# control-dyn-dns.pl
#
# for unix only (tested only on Ubuntu Lucid 10.04), needs prg hostname

#       Description:
# My ip-adress is saved at dyn-server (e.g. dtdns.net) and can be requested from there.
# It will be saved and updated to $cachefile, if my dynamic dns has changed.
# $cachefile saves the time and the last ip got after having invoked this script
# and the changed ip was written to the dyn-server.

#       Usage:
#               control-dyn-dns [ ip | 0.0.0.0 | -f ]           # no or one param possible
#               ( ip e.g. 123.124.125.126 )

#  # First current ip is requested and written to $cachefile.
#  # Run with no param, it finds current ip and writes it to the dyn-server only, if
#               not equal to ip saved in $cachefile (avoids too much traffic).
#               Nevertheless 30 days after last updating it will update the ip on the server
#               to make the server happy.
#  # Run with an ip as param (x.x.x.x) writes this ip to the dyn-server.
#  # Run with param 0.0.0.0 writes this ip to the dyn-server implying the ip is unreachable.
#  # Run with -f as param writes the ip to the dyn-server w/o reading $cachefile.
#  # Controls,
#