This is an heads-up from the Mediacom Network Operations Center about an issue we are seeing. We were recently given an IP scope from ARIN (American Registry for Internet Numbers) that still exists on older Bogon lists many web providers are currently using. A Bogon prefix is a route that should never appear in the Internet routing table. A packet routed over the public Internet (not including over VPN or other tunnels) should never have a source address in a Bogon range. These are commonly found as the source addresses of DDoS attacks. The IP scope referenced is a 173.x.x.x. This IP scope was on the Bogon list and was blocked by all websites using a Bogon prefix up until February of 2008, when it was released by IANA (Internet Assigned Numbers Authority) for public use and an updated Bogon prefix was provided. Mediacom customers that are within this IP range are not able to reach a website hosted by many organizations. Mediacom is individually requesting that these providers update their Bogon prefix to the most current version to resolve this issue immediately. We are requesting assistance from this community to make this issue known and to advise administrators to update to the most current Bogon list. We have provided some reference material that many may find helpful in resolving this issue. Bogons are defined as Martians (private and reserved addresses defined by <http://www.ietf.org/rfc/rfc1918.txt> RFC 1918 < <http://www.faqs.org/rfcs/rfc1918.html> http://www.faqs.org/rfcs/rfc1918.html> and <http://www.ietf.org/rfc/rfc3330.txt> RFC 3330 < <http://www.faqs.org/rfcs/rfc3330.html> http://www.faqs.org/rfcs/rfc3330.html>) and netblocks that have not been allocated to a regional internet registry (RIR) by the Internet Assigned Numbers Authority < <http://www.iana.org/> http://www.iana.org/>. IANA maintains a convenient IPv4 summary page < <http://www.iana.org/assignments/ipv4-address-space> http://www.iana.org/assignments/ipv4-address-space> listing allocated and reserved netblocks. Please help to spread the word. Nick Downey Director Network Operations Center Mediacom Communications Main (800)308-6715 Secondary (515)267-1167 ndowney@mediacomcc.com ============================================================================ ================================================================ LEGAL DISCLAIMER ============================================================================ ================================================================ This E-mail and any attachments are strictly confidential and intended solely for the addressee. You must not disclose, forward or copy this E-mail or attachments to any third party without the prior consent of the sender or Mediacom Communications Corporation. If you are not the intended addressee please notify the sender by return E-mail and delete this E-mail and its attachments. ============================================================================ ================================================================