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+%include "default.mgp"
+%default 1 bgrad
+%deffont "typewriter" tfont "MONOTYPE.TTF"
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+%nodefault
+%back "blue"
+
+%center
+%size 8
+
+
+
+IPv6 Introduction
+
+
+%center
+%size 4
+by
+
+Harald Welte <laforge@rfc2460.org>
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+What? Why?
+
+ What is IPv6?
+
+ Successor of currently used IP Version 4
+ Specified 1995 in RFC 2460
+
+ Why?
+
+ Address space in IPv4 too small
+ Routing tables too large
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Advantages
+
+ Advantages
+ stateless autoconfiguration
+ multicast obligatory
+ IPsec obligatory
+ Mobile IP
+
+ Address renumbering
+ Multihoming
+ Multiple address scopes
+ smaller routing tables through aggregatable allocation
+
+ simplified l3 header
+ 64bit aligned
+ no checksum (l4 or l2)
+ no fragmentation at router
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Disadvantages
+
+ Disadvantages
+ Not widely deployed yet
+ In most cases access only possible using manual tunnel
+ OS support not ideal in most cases
+ W2k: IPv6 available from MS
+ Windows XP: IPv6 included
+ Linux has support, but not 100% RFC compliant
+ *BSD: full support (KAME)
+ Solaris 8/9/10: full support
+ Application support not ideal in most cases
+ Biggest problem: squid
+ supported: bind8/9, apache, openssh, xinetd, rsync, exim, zmailer, sendmail, qmail, inn-2.4(CVS), zebra, mozilla
+ Conclusion: Circular dependencies
+ no application support without OS support
+ no good OS support without applications
+ no wide deployment without applications
+ no applications without deployment
+ no deployment without applications
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Deployment
+
+ Experimental (6bone)
+ Experimental 6bone (3ffe::) has been active since 1995.
+ Uses slightly different Addressing Architecture (RFC2471)
+ Phased out on 06/06/2006
+ No new pTLA assignments starting from 2005
+
+ Production (2001::)
+ Initial TLA's and sub-TLA's assigned in Sept 2000
+ Mostly used in education+research
+ Some commercial ISP's in .de are offering production prefixes
+
+ Why isn't IPv6 widely used yet?
+ No immediate need in Europe / North America
+ Big deployment cost at ISP's (Training, Routers, ..)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Technical: Address Space
+
+ IP Version 6 Addressing Architecture (RFC2373)
+ Format prefix, variable length
+ 001: RFC2374 addresses, 1/8 of address space
+ 0000 001: Reserved for NSAP (1/128)
+ 0000 010: Reserved for IPX (1/128)
+ 1111 1110 10: link-local unicast addresses (1/1024)
+ 1111 1110 11: site-local unicast addresses (1/1024)
+ 1111 1111 flgs scop: multicast addresses
+ flgs (0: well-known, 1:transient)
+ scop (0: reserved, 1: node-local, 2: link-local, 5: site-local, 8: organization-local, e: global scope, f: reserved)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Technical: Address Space
+
+ Aggregatable Global Unicast Address Format (RFC2374)
+ 3bit FP (format prefix = 001)
+ 13bit TLA ID - Top-Level Aggregation ID
+ 13bit Sub-TLA - Sub-TLA Aggergation ID
+ 19bit NLA - Next-Level Aggregation ID
+ 16bit SLA - Site-Level Aggregation ID
+ 64bit Interface ID - derived from 48bit ethernet MAC
+ Initial subTLA-Assignments
+ 2001:0000::/29 - 2001:01f8::/29 IANA
+ 2001:0200::/29 - 2001:03f8::/29 APNIC
+ 2001:0400::/29 - 2001:05f8::/29 ARIN
+ 2001:0600::/29 - 2001:07f8::/29 RIPE
+ loopback ::1
+ unspecified: ::0
+ embedded ipv4
+ IPv4-compatible address: 0::xxxx:xxxx
+ IPv6-mapped IPv4 (IPv4 only node): 0::ffff:xxxx:xxxx
+ anycast
+ allocated from unicast addresses
+ only subnet-router anycast address predefined (prefix::0000)
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Technical: Header
+
+%font "typewriter"
+%size 3
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |Version| Traffic Class | Flow Label |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Payload Length | Next Header | Hop Limit |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ + Source Address +
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ + Destination Address +
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+%font "standard"
+ 4bit Version: 6
+ 8bit Traffic Class
+ 20bit Flow Label
+ 16bit Payload Length (incl. extension hdrs)
+ 8bit next header (same values like IPv4, RFC1700 et seq.)
+ 8bit hop limit (TTL)
+ 128bit source address
+ 128bit dest address
+ extension headers:
+ hop-by-hop options
+ routing
+ fragment
+ destination options
+ IPsec (AH/ESP)
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Technical: Layer 2 <-> Address mapping
+
+
+ Ethernet: No more ARP, everything within ICMPv6
+ No Broadcast, everything built using multicast.
+
+ all-nodes multicast address ff02::1
+ all-routers multicast address ff02::2
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Technical: Address Configuration
+
+
+ router discovery
+ routers periodically send router advertisements
+ hosts can send router solicitation to explicitly request RADV
+
+ prefix discovery
+ router includes prefix(es) in ICMPv6 router advertisements
+ other nodes receive prefix advertisements and derive their final address from prefix + EUI64 of MAC address
+
+ neighbour discovery
+ machines can discover it's neighbours without advertising router
+
+
+%page
+IPv6 Introduction
+How to get connected
+
+ In case of static IPv4 address
+ SIT (ipv6-in-ipv4) tunnel possible
+ http://www.join.uni-muenster.de/
+
+ In case of dynamic IPv4 address
+ ppp (ipv6 over ppp) tunnel (pptp, l2tp) possible
+ sitctrl (linux <-> linux)
+ atncp (*NIX), http://www.dhis.org/atncp/
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Stateless Autoconfiguration
+
+
+ Address space is split in two 64bit halves
+ Upper 64bit '2001:780:44:1100:' used to specify a network segment (/64)
+ Lower 64bit '204:61ff:fe5c:74b9' used to specify node within segment
+ Lower 64bit are generated from 48bit mac address with 'fffe' in the middle
+ Potential Problem: Privacy
+ IETF Solution: RFC3041 "Privacy Extension"
+ uses additional 'alias' IPv6 adresses that are created randomly and only valid for hours/days
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+DNS and IPv6
+
+ Forward resolval (hostname->address)
+ IPv4 uses "IN A" record
+ IPv6 uses "IN AAAA" record
+ A particular hostname can have both A and AAAA
+
+ Reverse resolval (address->hostname)
+ Uses ".ip6.arpa." suffix
+ Uses hexadecimal instead of decimal notation
+ 4.4.0.0.0.0.0.0.0.8.7.0.1.0.0.2.ip6.arpa.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+BSD Sockets API and IPv6
+
+ new structures
+ in_addr has become in6_addr
+ sockaddr_in has become sockaddr_in6
+ new API's like getaddrinfo are compatible with ipv6 and ipv4
+ portable applications use sockaddrr_storage and don't make assumptions about it's size
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Configuration under Linux
+
+ Router/Gateway
+ Runs radvd or zebra for for sending router advertisements
+
+ Client
+ Just has to load "ipv6" module and configure interface up
+ Receives prefix-advertisements(s) and autoconfigures address
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+IPv6 option headers
+
+ New concept of option header
+ Any number of option headers between l3 and l4 header
+ With one exception only processed ad sender and receiver
+
+ Defined option headers
+ Hop-by-hop options (processed by every node)
+ Destination options
+ Routing header
+ Fragment header
+ Authentication (AH)
+ Encapsulating Security Payload (ESP)
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+IPv6 specific security issues
+
+ hop-by-hop options header
+ should be filtered out at typical internet gateway
+ routing header
+ should be filtered out like IPv4 loose source / record route
+ ICMPv6
+ has to be allowed for neighbour discovery to work
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+IPv6 specific security issues
+
+iptables -> ip6tables changes
+ matching of ah/esp
+ not by -p !
+ matching of fragments
+ not by -f !
+ no connection tracking in mainline kernel yet
+ existing ip6_conntrack patchces (deprecated)
+ code duplication
+ no interaction between ip_conntrack/ip6_conntrack
+ existing nf_conntrack patches
+ one code base to rule them all
+ ipv4 and ipv6 plugins
+ l3 independent tcp and udp modules independent
+ l3 independent helpers
+ BUT: no NAT as of now :(
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%page
+IPv6 Introduction
+Further Reading
+
+ http://www.ipv6-net.org/ (deutsches IPv6 forum)
+ http://www.6bone.net/ (ipv6 testing backbone)
+ http://www.freenet6.net/ (free tunnel broker)
+ http://hs247.com/ (list of tunnel brokers)
+
+ http://www.bieringer.de/ (ipv6 for linux)
+ http://www.linux-ipv6.org/ (improved ipv6 for linux)
+ http://www.kame.net/ (ipv6 for *BSD)
+ http://www.join.uni-muenster.de/ (ipv6 at DFN/WiN)
+
+ http://www.gnumonks.org/ (slides of this presentation)
+
+ And of course, all relevant RFC's
+
personal git repositories of Harald Welte. Your mileage may vary