ipchains on dynamic ip

Hi everybody, I have a questions. How to allow traffic to a specific port without specifying the ip-address. Does i.e. ipchains -I input -i ippp0 --destination-port 3128 -p tcp -j ACCEPT work? Which other ways a to filter dynamic ip-adresses? tia Oliver Block __________________________________________________________________ Gesendet von Yahoo! Mail - http://mail.yahoo.de Yahoo! präsentiert als offizieller Sponsor das Fußball-Highlight des Jahres: - http://www.FIFAworldcup.com