RFC 1817 (rfc1817) - Page 2 of 2

CIDR and Classful Routing

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RFC 1817               CIDR and Classful Routing             August 1995


   It is expected that in the near future the IANA will instruct the
   Internet Registries to begin allocating IP addresses out of the
   former Class A address space (64.0.0.0 through 126.0.0.0). The
   allocated blocks are going to be of variable size (based on the
   actual sites' requirements).  Sites that will use these addresses
   will have to support CIDR-capable routing protocols. All the
   providers will be required to support CIDR-capable routing protocols
   as well. Sites that do not use these addresses would be required to
   continue relying on a default route, which in turn may result in a
   various degree of suboptimal routing. If a site wants to avoid the
   suboptimality (introduced by using default route), the site will need
   to transition to CIDR-capable routing protocols.

Security Considerations

   Security issues are not discussed in this memo.

Author's Address

   Yakov Rekhter
   cisco Systems
   170 West Tasman Drive
   San Jose, CA 95134

   Phone: (914) 528-0090
   EMail: 

























Rekhter                      Informational
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