Welcome to Catalin(ux) M. BOIE's page!
Here you can find some work of mine on Linux kernel & other stuff.

E-mail: catab # embedromix dot ro
Phone: +40-745-048374
RSS feed for this site
My Fedora repository: rpm -Uhv http://kernel.embedromix.ro/dinorepo-0.0.12-1.noarch.rpm
My Oracle/RedHat/CentOS repository: rpm -Uhv http://kernel.embedromix.ro/dinorepo-el-0.0.13-1.noarch.rpm
Supported architectures: x86_64, i386, armv7hl, aarch64.
For commercial support and customizations, contact us at: Embedromix

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Name Description Links
Presentations Presentations made by me present.html
IFB A mini howto on how to shape on incoming packets and distribute packets on multiple interfaces, sharing bandwidth. ifb.html
RAID mini HOWTO A mini howto describing linear, 0, 1, 5 and 6, using mdadm. RAID.html
git mini HOWTO A mini howto describing how to use git. git.html
LVM mini HOWTO A mini howto describing how to use LVM. LVM.html
IPv6 mini howtos Some mini howtos to easy IPv6 implementation. ipv6.html
Random stuff Some usefull one-liners. random.html

Name Description Links
IPv6 6to4 A mini howto describing 6to4 tunneling. ipv6-6to4.html
IPv6 ULIUA A mini howto describing "Unique Local IPv6 Unicast Addresses". ipv6-uliua.html

IPv6 - 6to4 tunneling

Content: 6to4 tunneling for fastest and simplest way to be IPv6 enabled.
Author: Catalin(ux) M BOIE
URL: http://kernel.embedromix.ro/docs/
Version: 0.1
IPv6 class used for this tunneling is 2002::/16:
  • Format prefix (first 3 bits) are 001
  • TLA (next 13 bits) are 0x0002
  • V4ADDR (next 32 bites) are the IPv4 address
  • SLA ID (next 16 bits are the site local network)
  • Rest of 64 bits are the interface id.
For an IPv4 host you have a /48 class, so 65536 /64 local network can be assigned internally.

IPv6 packets are packed in an IPv4 packet, with protocol 41.

Example of a 6to4 configuration:
  • In /etc/sysconfig/iptables, add: "-A INPUT -p ipv6 -j ACCEPT" and restart (service iptables restart).
  • In /etc/sysconfig/network add NETWORKING_IPV6=yes and IPV6_DEFAULTDEV=tun6to4.
  • In /etc/sysconfig/network-scripts/ifcfg-eth0 add IPV6INIT=yes and IPV6TO4INIT=yes.
  • Restart network (service network restart).
  • Allow IPv6 access to your services: add in /etc/sysconfig/ip6tables INPUT ACCEPT rules.
  • ping6 www.sixxs.net or ping6 kernel.embedromix.ro or tracepath6 kernel.embedromix.ro.

  • RFC3056
  • You have to activate IPv6 forwarding (/etc/sysconfig/network:IPV6FORWARDING=yes) if you want to delegate some subnetworks inside. Also, you have to allow forwarding by adding FORWARD rules to /etc/sysconfig/ip6tables
  • If you have a connection with a tunnel broker, it is still better to use a 6to4 tunnel (ifcfg-eth?: IPV6INIT=yes, IPV6TO4INIT=yes) to direclty access 6to4 hosts because there is a more shorter route.
  • radvd