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Script

  • Thanks to some good pointers from Vibhor Amrodia here, I was able to rewrite my Linux Netfilter countryblock script to create object-groups for Cisco ASA firewalls which can easily be used in access-lists. This example loads the IP-ranges of China, Korea and Palestine from ipdeny.com and creates a config file. This config file can easily be copied from a TFTP server to the running config of the ASA. I chose those 3 countries because the vast majority of probes, scans and SIP fraud attempts on my network come from there.

  • Ever since DynDNS.org has dropped all free services, I have been looking for good alternatives. Here in Finland, the IP addresses of the cable and DSL ISPs don't change excessively often, so for a while, it was ok for me to change the A record of my home server by hand in the cPanel DNS editor of my hoster.

  • PERL script to dynamically update the IP of a host via the cPanel-API. This script was written to work with the Finnish hoster Neobitti but it might work with other hosters which use cPanel too.