Readers are urged to consult the following ftp site,

ftp.greatcircle.com

for more information on firewalls. This site contains information on firewall vendors, firewall-related papers and articles, and collections of mailing list postings organized by topic. This site also maintains a mailing list on firewall issues; information about the mailing list is available on-line at the site.

In addition to the above, a number of router and firewall vendors maintain e-mail lists and ftp sites that contain firewall and Internet security-related information. Check with your vendor for the appropriate address.