[17493] in North American Network Operators' Group
industry filtering rules
daemon@ATHENA.MIT.EDU (Lehrer, Neil)
Wed Jun 3 15:16:52 1998
Date: Wed, 3 Jun 1998 15:06:12 -0400
From: "Lehrer, Neil" <nlehrer@usia.gov>
To: nanog@merit.edu
hi,
sprintlink's filter policy for non sprintlink customers is shown below.
do other large providers have similar policies? i am a sprintlink
customer and am trying to understand how these policies are implemented
in the industry. thanks.
ip nums cidr
RFC 1918 Reserved Addresses Disallow 10.0.0.0/8, 172.16.0.0/12, and
192.168.0.0/16
0-126 /8 Allow no subnets of historical addresses that were not
announced in July 1995
127-191 /8 Allow nothing longer than /16 (i.e., /17, /18, /19, etc.)
192-205 /8 Allow nothing longer than /24 (i.e., /25, /26, /27, etc.)
206-223 /8 Allow nothing longer than /19 (i.e., /20, /21, /22, etc.)
195 /8 Allow nothing longer than /19 (i.e., /20, /21, /22, etc.)
24 /8 Allow nothing longer than /19 (i.e., /20, /21, /22, etc.)
*The principal change is that we used to disallow /19s in 206/8-223/8 and
195/8, and this was not; in line with the minimal allocation units
performed by the three primary registries
Regards
+++++++++++++++++++++++++++++++++++++++
+ Neil Lehrer
+ U.S. Information Agency
+ Networks and Systems Support Division
+
+ voice 202 619-0903
+ fax 202 619-3883
+ internet nlehrer@usia.gov
+
+ "oh what a tangled net we weave
+ when we seek to retrieve."
+
+++++++++++++++++++++++++++++++++++++++
