From fca59bea770346cf1c1f9b0e00cb48a61b44a8f3 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sun, 25 Oct 2015 21:00:20 +0100 Subject: import of old now defunct presentation slides svn repo --- 2005/ipv6-astaro2005/topics | 114 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 2005/ipv6-astaro2005/topics (limited to '2005/ipv6-astaro2005/topics') diff --git a/2005/ipv6-astaro2005/topics b/2005/ipv6-astaro2005/topics new file mode 100644 index 0000000..da33a44 --- /dev/null +++ b/2005/ipv6-astaro2005/topics @@ -0,0 +1,114 @@ +What is IPv6? + Successor of currently used IP Version 4 + Specified 1995 in RFC? 2460 +Why? + Address space in IPv4 too small + +Advantages? + stateless autoconfiguration + multicast obligatorisch + IPsec obligatorisch + Mobile IP + QoS ? + + Address Renumbering? + Multihoming? + AddressScopes? + smaller routing tables through G + + simplified l3 header + 64bit aligned + no checksum (l4 or l2) + no fragmentation at router + +Disadvantages + Not widely deployed yet + In most cases access only possible using manual tunnel + OS support not ideal in most cases + W2k? + Linux has support, but no IPsec in official tree -> USAGI + *BSD: full support (KAME + Application support not ideal in most cases + not supported: + supported: bind8/9, apache + +Deployment + Experimental 6bone (3ffe::) has been active since 199x. + Uses slightly different Addressing Architecture (RFC2471) + +Why isn't it widely used yet? + No immediate need in Europe / North America + Big deployment cost at ISP's (Training, Routers, ..) + +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: multicast addresses + 1111 1111 flgs scop + 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) + 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 + + 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 + IPv4-mapped IPv4 (IPv4 only node): 0::ffff:xxxx:xxxx + anycast + allocated from unicast addresses + only subnet-router anycast address predefined (prefix::0000) + + +Technical: Header + + 4bit Version: 6 + 8bit Traffic Class + 20bit Flow Label + 16bit Payload Length (incl. extension hdrs) + 8bit next header (same values like IPv4, RF1700 et seq.) + 8bit hop limit (TTL) + 128bit source address + 128bit dest address + + extension headers: + hop-by-hop options + routing + fragment + destination options + authentication + encapsulating security payload + +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 + + +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 + + -- cgit v1.2.3