svn commit: r42592 - head/en_US.ISO8859-1/books/handbook/advanced-networking

[Brad Davis]

Author: brd
Date: Tue Aug 27 14:55:38 2013
New Revision: 42592
URL: http://svnweb.freebsd.org/changeset/doc/42592

Log:
  - More IPv6 cleanup
    - Place more emphasis on running out of IPv4 addresses and cite IANA running out of IPv4 addresses.
  
  Reviewed by:	gavin@

Modified:
  head/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml

Modified: head/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
==============================================================================
--- head/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml	Tue Aug 27 14:01:43 2013	(r42591)
+++ head/en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml	Tue Aug 27 14:55:38 2013	(r42592)
@@ -5021,17 +5021,25 @@ redirect_port tcp 192.168.0.3:80 80</pro
 
     <itemizedlist>
       <listitem>
-	<para>Running out of addresses.  Today this is not so much of
-	  a concern, since RFC1918 private address space (<hostid
-	    role="ipaddr">10.0.0.0/8</hostid>, <hostid
-	    role="ipaddr">172.16.0.0/12</hostid>, and <hostid
-	    role="ipaddr">192.168.0.0/16</hostid>) and
-	  <acronym>NAT</acronym> are being employed.</para>
+	    <para>Running out of addresses.  For years the use of RFC1918
+		  private address space
+		  (<hostid role="ipaddr">10.0.0.0/8</hostid>,
+		  <hostid role="ipaddr">172.16.0.0/12</hostid>, and
+		  <hostid role="ipaddr">192.168.0.0/16</hostid>) and NAT has
+		  slowed down the exhaustion.  Even though, there are very few
+		  remaining IPv4 addresses.  The Internet Assigned Numbers
+		  Authority (<acronym>IANA</acronym>) has issued the last of
+		  the available major blocks to the Regional Registries.
+		  Once each Region Registry runs out, there will be no more
+		  available and switching to <acronym>IPv6</acronym> will be
+		  critical.</para>
       </listitem>
 
       <listitem>
-	<para>Router table entries were getting too large.  This is
-	  still a concern today.</para>
+	    <para>Every block of IPv4 addresses allocated required routing
+		  information to be exchanged between many routers on the
+		  Internet, and these routing tables were getting too large to
+		  allow efficient routing.</para>
       </listitem>
     </itemizedlist>
 
@@ -5054,7 +5062,7 @@ redirect_port tcp 192.168.0.3:80 80</pro
       </listitem>
     </itemizedlist>
 
-    <para>There are other useful features of
+    <para>There are many other useful features of
       <acronym>IPv6</acronym>:</para>
 
     <itemizedlist>