big ipv6 update from Pekka Savola (<pekkas@netcore.fi>)

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+v1.1 18th Apr 2001, Pekka Savola <pekkas@netcore.fi>
+v1.2 23th May 2001, Pekka Savola <pekkas@netcore.fi>
+
+HOW TO SET UP IPV6 WITH 6TO4
+----------------------------
+
+6TO4 IN SHORT
+-------------
+
+6to4 is a method of creating automatic IPv6 tunnels.  You can connect to 
+IPv6 Internet very easily without a need for a manually configured tunnel.
+
+For every globally unique IPv4 address, there exists a mapping for a
+subnettable /48 network (2^16 for subnetting, 2^64 bits for hosts).
+
+Return route can sometimes be non-optimal, leading to higher round-trip times.
+
+See below for references and more information.
+
+ASSUMPTIONS
+-----------
+
+1. You're running Red Hat Linux 7.1 or later.
+   
+   This is required for correct IPv6 by default settings, and IPv6 being
+   enabled as a kernel module by default.  
+
+2. Your initscripts >= 5.83.2, for 6to4 support.
+
+3. You have a static, globally unique IPv4 address.  This is not an absolute
+   requirement, but the only scenario discussed here.
+
+4. Protocol 41 (IPv6) is not being filtered in any firewall.
+
+5. 'iproute' package is installed.  This is used by default for a lot 
+   more powerful tunneling capabilities.
+
+INFORMATION NEEDED
+------------------
+
+You need to know:
+
+1. The IPv4 address of a 6to4 relay router 
+
+See:  http://www.kfu.com/~nsayer/6to4/ for public ones.
+
+Here, 194.95.108.191 (6to4.ipv6.fh-regensburg.de) is used.
+
+SETTING UP THE 6TO4 CONFIGURATION
+---------------------------------
+
+Now, set up the configuration as follows:
+
+1. Add 'NETWORKING_IPV6=yes' to /etc/sysconfig/network:
+
+   echo "NETWORKING_IPV6=yes" >> /etc/sysconfig/network
+
+2. Add static routes to IPv6 Internet (this includes 6bone):
+
+   echo "sit0	2000::/3"  >>  /etc/sysconfig/static-routes-ipv6
+
+NOTE: sit0 is used for 6to4 routing.
+
+3. Edit your outbound (Internet) interface configuration.  This can be 
+e.g. ippp0, eth0, or the like. Here, eth0 is used.  
+
+/etc/sysconfig/network-scripts/ifcfg-eth0:
+---
+DEVICE=eth0
+BOOTPROTO=static
+ONBOOT=yes
+IPADDR=xx.yy.zz.ww
+NETMASK=aa.bb.cc.dd          [IPv4 settings up to this point]
+
+IPV6INIT=yes
+IPV6TO4INIT=yes
+IPV6TO4_RELAY=194.95.108.191
+---
+
+USING 6TO4
+----------
+
+6to4 automatic tunneling is brought up when the interface is brought up.
+
+You will see your 6to4 address prefix in device sit0 when done:
+
+	inet6 addr: 2002:c15e:a001::1/48 Scope:Global
+
+Note that 'c15e:a001' is the hexadecimal representation of dotted-quad IPv4
+address (IPADDR= above), here '193.94.160.1'.
+
+NOTE: iproute tools give more reliable data, try e.g. '/sbin/ip addr ls'.
+
+SUBNETTING
+----------
+
+If you want to provide IPv6 for your LAN using your Linux system as a
+router, this can be done rather easily with 6to4.
+
+You will need to enable IPv6 forwarding (IPV6FORWARDING=yes in
+/etc/sysconfig/network) and install a router advertisement daemon.  One such,
+'radvd' is available in Powertools.  
+
+You must configure the prefix your IPv4 maps to (see sit0 above) in 
+/etc/radvd.conf or use certain automatic hooks.  This is not covered here 
+in detail; see radvd.conf(5) and /etc/sysconfig/network-scripts/ifup-ipv6 
+for details.
+
+MORE INFORMATION
+----------------
+
+http://www.bieringer.de/linux/IPv6/IPv6-HOWTO/IPv6-HOWTO.html is a good
+source of IPv6 related Linux-information.
+
+ftp://ftp.isi.edu/in-notes/rfc3056.txt ("Connection of IPv6 Domains via IPv4
+Clouds") is the RFC about 6to4.
+
+ftp://ftp.itojun.org/pub/paper/draft-itojun-ipv6-transition-abuse-01.txt
+("Possible abuse against IPv6 transition technologies") explains some
+security considerations in 6to4.