
Chapter 3 • Patching IPv4 49
+--------+-+-------+--------+--------+
| 39 |1| variable prefix + local |
+--------+-+-------+--------+--------+
^
|
\
high order bit of the
local part of the address
Figure 3–4: “Case 2” from RFC 1797.
Setting the high-order bit of the local part of the address to 1 for the pur-
poses of this experiment would have signified that the address space would
be allocated explicitly by the IANA (see Figure 3–4). This option was not
used during the experiment.
As reported in RFC 1879, existing router software was capable of handling
subnetted Class A networks and even includes examples to be used to
configure typical routers.
3.7 Network ...