I want to allow incoming traffic from hosts that run on changing IP-addresses supplied by the ISP. These hosts have their current IP-address registered with dyndns.org as soon as they connect to the internet. As far as I have understood it, filters can act on IP-addresses but not on hostnames. Since the originating IP-address changes, all I am left with is the known hostname. As far as I have understood it, filters can act on IP-addresses but not on hostnames. I would like to do a hostname lookup based on the name registered at dyndns.org and compare that with the IP-address of the incoming traffic. -- INPHO GmbH * Smaragdweg 1 * 70174 Stuttgart * Germany phone: +49 711 2288 10 * fax: +49 711 2288 111 * web: www.inpho.de place of business: Stuttgart * managing director: Johannes Saile commercial register: Stuttgart, HRB 9586