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authorDavid Kaspar [Dee'Kej] <dkaspar@redhat.com>2018-05-25 20:01:54 +0200
committerDee'Kej <deekej@linuxmail.org>2018-05-30 12:32:22 +0200
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-v1.5 1st Sep 2003, 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 >= 6.02, 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-in-IPv4) is not being filtered in any IPv4 firewall.
-
-5. 'iproute' package is installed. This is used by default for a lot
- more powerful tunneling capabilities.
-
-Note: even though 6to4 was supported with earlier releases of Red Hat Linux,
-below it is assumed that the initscripts package version this
-document comes with is used.
-
-INFORMATION NEEDED
-------------------
-
-Nothing :-).
-
-If you want to select a specific relay (rather than automatically
-selecting the closest one), you can define it with IPV6TO4_RELAY
-using the list below:
-
-http://www.kfu.com/~nsayer/6to4/
-
-SETTING UP THE 6TO4 CONFIGURATION
----------------------------------
-
-Now, set up the configuration as follows:
-
-1. Enable IPv6 and set 6to4 pseudo-interface as default gateway in
- /etc/sysconfig/network:
-
- echo "IPV6_DEFAULTDEV=tun6to4">> /etc/sysconfig/network
-
-2. Edit your outbound (Internet) interface configuration. This can be
- e.g. ippp0, ppp0, eth0, or the like. Here, eth1 is used.
-
-
-/etc/sysconfig/network-scripts/ifcfg-eth0:
----
-DEVICE=eth0
-BOOTPROTO=none
-ONBOOT=yes
-IPADDR=xx.yy.zz.ww [Globally unique IPv4 address]
-NETMASK=aa.bb.cc.dd [IPv4 settings up to this point]
-
-IPV6INIT=yes
-IPV6TO4INIT=yes
----
-
- Note: [i]ppp - interfaces need to be called in /etc/ppp/ip-up|down.local;
- if you are not using local files by yourself, this can easily be done with:
-
- cd /etc/ppp
- ln -s ip-up.ipv6to4 ip-up.local
- ln -s ip-down.ipv6to4 ip-down.local
-
-
-USING 6TO4
-----------
-
-6to4 automatic tunneling is brought up when the interface is brought up.
-
-You will see your 6to4 address prefix in device tun6to4 when done:
-
- inet6 addr: 2002:c15e:a001::1/16 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'.
-
-PROVIDING IPV6 TO YOUR LAN
---------------------------
-
-If you want to provide IPv6 for your LAN (e.g. connected on eth1)
-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 the distribution.
-
-You must configure the prefix your IPv4 maps to (see tun6to4 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.
-
-Usually the following is enough:
-
-1. Make sure that radvd package is installed.
-
-2. Configure radvd as outlined in radvd.conf(5); the file could
- be something like:
-
- interface eth1
- {
- AdvSendAdvert on;
- MinRtrAdvInterval 3;
- MaxRtrAdvInterval 10;
- prefix 0:0:0:1::/64
- {
- Base6to4Interface eth0;
- AdvPreferredLifetime 120;
- AdvValidLifetime 300;
- };
- };
-
-3. Make sure radvd starts at boot and start it now:
-
- /sbin/chkconfig radvd on
- /sbin/service radvd start
-
-4. Make the initscripts signal radvd to recalculate the prefix when it
- changes:
-
- /etc/sysconfig/network-scripts/ifcfg-eth0:
-
- IPV6_CONTROL_RADVD=yes
-
-5. Configure the associated routes to other 6to4 subnets to point at
- your LAN interfaces; this can be done automatically with
- IPV6TO4_ROUTING variable; please refer sysconfig.txt for details.
- In the particular example, above, this would be like:
-
- /etc/sysconfig/network-scripts/ifcfg-eth0:
-
- IPV6TO4_ROUTING="eth1-:1::0/64"
-
- However, please note that no global address is configured on the
- interface, just a route!
-
-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.isi.edu/in-notes/rfc3068.txt ("An Anycast Prefix for 6to4 Relay
-Routers") is the RFC about finding a close 6to4 relay automatically.
-
-http://www.ietf.org/internet-drafts/draft-savola-v6ops-6to4-security-02.txt
-("Security Considerations and Enhancements for 6to4") explains some
-security considerations in 6to4.