Taiwan Network Information Center Spam Status & Anti-Spam Schemes in Taiwan Taiwan Network Information Center David Chen Sep 5, 2002

© Taiwan Network Information Center Outline The Effect of Spam Current Anti-Spam Strategies ASTF The Obstacles of Schemes

© Taiwan Network Information Center The Effect of Spam (1) Net Consumers Association Taiwan made a public opinion poll report – 1/3 people spend 10 mins to handle spam every day – Over 70% people feel annoyed – 75% people say they don ’ t want to receive spam any more – 90% people think it ’ s unfair to share the cost of spam including ISP – 2/3 people in favor of introducing appropriate law, the other third say it ’ s not necessary

© Taiwan Network Information Center The Effect of Spam (2) – The Cost of Spam End user – US$1,830 Million a year – Waste of internet resources, waiting time and mail server crush ISP – Wasting bandwidth cost US$8 Million a year – Hardware renew, Software develop and maintainer ’ s cost can ’ t evaluate Source :

© Taiwan Network Information Center IP/netmaskamountIP/netmaskamount / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /16189 Blocked IP : 1,008,354 Taiwan IP blocked list in spam.dnsrbl.net (RBL) Total IP : 11,455,744Aug.15, 2002

© Taiwan Network Information Center The Effect of Spam (4) IP blocked rate of the 3 major Taiwan ISPs Top 3 ISP In Taiwan Blocked IP amount(/24) Blocked IP/ Total blocked Blocked IP/ Total allocated HiNet % 25.7 % SeedNet % 11.1 % TANet % 0.14 % Aug.15, 2002

© Taiwan Network Information Center The Effect of Spam (5) Top ISPs with blocked IP Rank ISP Blocked IP amount (/24) Blocked IP / Total blocked Blocked IP / Total allocate 1 HiNet % 25.7 % 2 FetNet % 49.7 % 3 SeedNet % 11.1 % 4 Savecom % 25 % 5 Pagic % 21.4 % 6 Netpoly % 60 % 7 Dome % 60 % Aug.15, 2002

© Taiwan Network Information Center Current Anti-Spam strategies (1) ISP Network Administrator – Set up the channel for complainants – Educate and announce anti-spam policies – Close open relay function on the mail server – Filter outgoing spam on the Router or Mail Server temporarily – Block incoming spam on the Router or Mail server temporarily – Manage and log dynamic IP user behavior – Terminate spamers ’ connections

© Taiwan Network Information Center Current Anti-Spam strategies(2) Mail Server Administrator – Filter outgoing and block incoming Spam – Self-detect open relay function Instruction refer to – Close open relay function Instruction refer to fix.html User – Filter mails – Delete mails

© Taiwan Network Information Center Current Anti-Spam strategies(3) TWNIC Anti-Spam Plan – Filtering IP or domain name on Router port:25 Temporarily – Using mail server procmail function to check spam pattern in procmailrc.spam file – Using mail server access.db function to filter IP or domain name – Setting up mail server sendmail.cf to check sender ’ s IP ON LINE through DNS query

© Taiwan Network Information Center Current Anti-Spam strategies(4) – Using RBL DNS Check Spam List – Spam.dnsrbl.net – Blackholes.mail-abuse.org – Rsbl.aupads.org – Tbl.maps.vix.com Check Dial Up IP List – Duinv.aupads.org – Dul.maps.vix.com Check Open Relay List – Orvedb.aupads.org – Relays.mail-abuse.org – Relays.orbs.org

© Taiwan Network Information Center ASTF (1) Anti-Spam Task Force (ASTF) – established by TWNIC on June 2002 – Free membership – Encourage all major ISPs to join – Goals To reduce spam To protect users from Getting SPAM To educate users NOT spamming and filtering To coordinate ISPs and jointly find out the solution No more blocked IP from Taiwan

© Taiwan Network Information Center ASTF (2) Implementation – Promote Anti-Spam awareness Setup WEB sites Seek new technology or mechanism – Create tw-anti-spam mail list for ASTF members

© Taiwan Network Information Center ASTF (3) Discussing Topics in the mailing list – Do we need a new TW-RBL ? It ’ s still a controversial issue – Should we build a RT System to track SPAM complaints ? Most of members say Yes – Do we need to build a WEB site for publishing anti-spam knowledge how to handle spam ? Yes, It ’ s under construction – Do we need to create a review procedure to determine and deal with spamers IP ? Yes, but not now

© Taiwan Network Information Center ASTF (4) Management and Law – Management regulation for Government Service Network, GSN – Legislating “ Electronic advertisement mail management law ” draft to against spam Clarify sender message Permitted by receiver in advance Against unfair network cost to end user Restrict advertise mail usage Indemnity to victim

© Taiwan Network Information Center The Obstacles of Schemes Defining Spam criteria is difficult Small group of people like Spam ISPs may lose some customers ISPs may not apply the new RBLs Legislation is a long process

© Taiwan Network Information Center Thank You