IPv4aaS tutorial and hands-on
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This document discusses various techniques for IPv6 transition and coexistence with IPv4, including: - Dual-stack which allows simultaneous support of both IPv4 and IPv6. - Tunnels which encapsulate IPv6 packets in IPv4 packets to provide IPv6 connectivity through IPv4 networks. - Translation techniques like NAT64 which allow communication between IPv4-only and IPv6-only nodes.
![- 8
IPv6 Transition Mechanisms
• Some transition mechanism based on tunnels and/or translation:
– 6in4 [6in4]
– TB [TB]
– TSP [TSP]
– 6to4 [6to4]
– Teredo [TEREDO], [TEREDOC]
– Túneles automáticos [TunAut]
– …
– ISATAP [ISATAP]
– 6over4 [6over4]
– Softwires
– 6RD
– NAT64
– DS-Lite
– lw4o6
– 464XLAT
– MAP E/T
– …](https://image.slidesharecdn.com/ipv4aas-tutorial-and-hands-on-190306031038/85/IPv4aaS-tutorial-and-hands-on-8-320.jpg)
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NAT64 (3)
• It’s known that there are things that doesn’t work:
– Everything out of TCP,UDP, or ICMP: Multicast, Stream Control
Transmission Protocol (SCTP), the Datagram Congestion Control
Protocol (DCCP), and IPSEC
– Applications that carry layer 3 information in the application layer: FTP
[RFC6384], SIP/H323
– Some apps: online gaming, skype, etc.
• Peer-to-peer using IPv4 “references”
– Literal addresses
– Socket APIs](https://image.slidesharecdn.com/ipv4aas-tutorial-and-hands-on-190306031038/85/IPv4aaS-tutorial-and-hands-on-19-320.jpg)
![- 24
How 464XLAT works?
CLAT PLAT
ISP
+
IPv6 Internet
Public IPv4Private IPv4
IPv4
Internet
IPv4
+
IPv6
IPv4
IPv6
IPv6
IPv6
Stateless (4->6)
[RFC6145]
Stateful (6->4)
[RFC6146]
CLAT: Customer side translator (XLAT)
PLAT: Provider side translator (XLAT)
IPv4
IPv6](https://image.slidesharecdn.com/ipv4aas-tutorial-and-hands-on-190306031038/85/IPv4aaS-tutorial-and-hands-on-24-320.jpg)
![- 26
464XLAT Addressing
CLAT PLAT
ISP
+
IPv6 Internet
200.3.14.147192.168.2.3
IPv4
Internet
IPv4
+
IPv6
IPv4
IPv6
IPv6
IPv6CLAT
XLATE SRC prefix
[2001:db8:abcd::/96]
XLATE DST prefix
[2001:db8:1234::/96]
PLAT
IPv4 pool
(192.1.0.1 – 192.1.0.250)
XLATE DST prefix
[2001:db8:1234::/96]
IPv4
IPv6
2001:db8:abcd::ab
2001:db8:dada::bb
IPv4 SRC
192.168.2.3
IPv4 DST
200.3.14.147
Stateless
XLATE
[RFC6145]
Stateful
XLATE
[RFC6146]
IPv6 SRC
2001:db8:abcd::192.168.2.3
IPv6 DST
2001:db8:1234::200.3.14.147
IPv4 SRC
192.1.0.1
IPv4 DST
200.3.14.147](https://image.slidesharecdn.com/ipv4aas-tutorial-and-hands-on-190306031038/85/IPv4aaS-tutorial-and-hands-on-26-320.jpg)
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Availability and Deployment
• NAT64:
– A10
– Cisco
– F5
– Juniper
– NEC
– Huawei
– Jool, Tayga, Ecdsys, Linux, OpenBSD, …
• CLAT
– Android (since 4.3)
– Nokia
– Windows
– NEC
– Linux
– Jool
– OpenWRT
– Apple (sort-of, is Bump-in-the-Host [RFC6535] implemented in Happy Eyeballs v2) - IPv6-only since iOS 10.2
• Commercial deployments:
– T-Mobile US: +68 Millions of users
– Orange
– Telstra
– SK Telecom
– …
– Big trials in several ISPs](https://image.slidesharecdn.com/ipv4aas-tutorial-and-hands-on-190306031038/85/IPv4aaS-tutorial-and-hands-on-27-320.jpg)
IPv4aaS tutorial and hands-on
- 1. - 1 IPv6 Transition and Coexistence IPv6-only and IPv4 as-a-Service APRICOT 2019 / APNIC 47 February 2019 Daejeon, South Korea @JordiPalet (jordi.palet@theipv6company.com)
- 2. - 2 Transition / Co-Existence Techniques • IPv6 has been designed for easing the transition and coexistence with IPv4 • Several strategies have been designed and implemented for coexisting with IPv4 hosts, grouped in three categories: – Dual stack: Simultaneous support for both IPv4 and IPv6 stacks – Tunnels: IPv6 packets encapsulated in IPv4 ones • This has been the commonest choice • Today expect IPv4 packets in IPv6 ones! – Translation: Communication of IPv4-only and IPv6-only. Initially discouraged and only “last resort” (imperfect). Today no other choice! • Expect to use them in combination!
- 3. - 3 Dual-Stack Approach • When adding IPv6 to a system, do not delete IPv4 – This multi-protocol approach is familiar and well-understood (e.g., for AppleTalk, IPX, etc.) – In the majority of the cases, IPv6 is be bundled with all the OS release, not an extra-cost add-on • Applications (or libraries) choose IP version to use – when initiating, based on DNS response: • if (dest has AAAA record) use IPv6, else use IPv4 – when responding, based on version of initiating packet • This allows indefinite co-existence of IPv4 and IPv6, and gradual app-by-app upgrades to IPv6 usage • A6 record is experimental
- 4. - 4 Dual-Stack Approach IPv6 Application TCP/UDP IPv6 TCP/UDP IPv6 TCP/UDP IPv4IPv4 IPv6 IPv4 IPv6-only stack IPv4-only stackDual-stack (IPv4 & IPv6) IPv6 Application IPv4 Application IPv4 Application
- 5. - 5 Tunnels to Get Through IPv6-Ignorant Routers • Encapsulate IPv6 packets inside IPv4 packets (or MPLS frames) in order to provide IPv6 connectivity through IPv4- only networks • Many methods exist for establishing tunnels: – manual configuration – “tunnel brokers” (using web-based service to create a tunnel) – “6over4” (intra-domain, using IPv4 multicast as virtual LAN) – “6to4” (inter-domain, using IPv4 addr as IPv6 site prefix) • Can view this as: – IPv6 using IPv4 as a virtual link-layer, or – an IPv6 VPN (virtual public network), over the IPv4 Internet (becoming “less virtual” over time, we hope)
- 7. - 7 Translation IPv4/IPv6 • May prefer to use IPv6-IPv4 protocol translation for: – new kinds of Internet devices (e.g., cell phones, cars, appliances) – benefits of shedding IPv4 stack (e.g., serverless autoconfig) • This is a simple extension to NAT techniques, to translate header format as well as addresses – IPv6 nodes behind a translator get full IPv6 functionality when talking to other IPv6 nodes located anywhere – they get the normal (i.e., degraded) NAT functionality when talking to IPv4 devices – methods used to improve NAT functionality (e.g, RSIP) can be used equally to improve IPv6-IPv4 functionality
- 8. - 8 IPv6 Transition Mechanisms • Some transition mechanism based on tunnels and/or translation: – 6in4 [6in4] – TB [TB] – TSP [TSP] – 6to4 [6to4] – Teredo [TEREDO], [TEREDOC] – Túneles automáticos [TunAut] – … – ISATAP [ISATAP] – 6over4 [6over4] – Softwires – 6RD – NAT64 – DS-Lite – lw4o6 – 464XLAT – MAP E/T – …
- 9. - 9 NAT444 NAT Internet IPv4 ISP network AFTR 10.0.0.x/24 AFTR NAT 10.0.0.x/24 v4 v4 v4 v4/v6 Internet IPv6 “plain” IPv6 Private IPv4 192.168.1.x NAT44 Level 1 NAT44 Level 2 Public IPv4
- 10. - 10 CGN breaks … • UPnP-IGD (Universal Plug & Play - Internet Gateway Device protocol) • NAT-PMP (NAT Port Mapping Protocol) • Other NAT Traversal mechs • Security • AJAX (Asyncronous Javascript And XML) • FTP (big files) • BitTorrent/Limewire (seeding – uploading) • On-line gaming • Video streaming (Netflix, Hulu, …) • IP cameras • Tunnels, VPN, IPsec, ... • VoIP • Port forwarding • ... • Most of the can be solved with extra work, ALGs, etc., but means extra resources, more overload of the CGN, so less throughput/performance: Need more CGNs for the same user-base
- 11. - 11
- 12. - 12 We don’t have IPv4 … • IPv4 exhaustion avoids – Assigning IPv4 to end-users – Assigning IPv4 even in public networks – Keep scalable interoperability with IPv4-only networks • Consequence: In many cases, we need to deploy IPv6-only networks – OpEx – No IPv4 resources (CapEx if you buy them) – Performance – Efficiency – RFCs – Other issues …
- 13. - 13 Dual Stack Lite (DS-Lite) • To cope with the IPv4 exhaustion problem. • Sharing (same) IPv4 addresses among customers by combining: – Tunneling – NAT • No need for multiple levels of NAT. • Two elements: – DS-Lite Basic Bridging BroadBand (B4) – DS-Lite Address Family Transition Router (AFTR) • Also called CGN (Carrier Grade NAT) or LSN (Large Scale NAT)
- 14. - 14 DS-Lite CPE (B4) Internet IPv4 ISP network AFTR 10.0.0.x/24 AFTR CPE (B4) 10.0.0.x/24 v4 v4 v4 v4/v6 Internet IPv6 “plain” IPv6 IPv6-only access IPv4-in-IPv6 tunnel NAT44 Level 1 Public IPv4
- 15. - 15 Lightweight 4over6 (lw4o6) • Similar to DS-Lite -> Changes NAT location – Better scalability – Reduces logging • Sharing SAME IPv4 addresses among several customers, combining: • Tunneling • NAT • No need for multiple levels of NAT • Two elements: • Lw Basic Bridging BroadBand (lwB4) - CPE • Lw Address Family Transition Router (lwAFTR)
- 16. - 16 lw4o6 CPE (lwB4) Internet IPv4 ISP network lwAFTR 10.0.0.x/24 lwAFTR CPE (lwB4) 10.0.0.x/24 v4 v4 v4 v4/v6 Internet IPv6 “plain” IPv6 IPv6-only access IPv4-in-IPv6 tunnel NAT44 Level 1 Public IPv4
- 17. - 17 NAT64 (1) • When ISPs only provide IPv6 connectivity, or devices are IPv6-only (cellular phones) • But still some IPv4-only boxes are on the Internet • Similar idea as NAT-PT, but working correctly • Optional element, but decoupled, DNS64 • Good solution if IPv4 is not required at the client – Client is IPv6-only • Some apps don’t work (Skype …) – Peer-to-peer using IPv4 “references” – Literal addresses – Socket APIs
- 18. - 18 NAT64 (2) • Stateful NAT64 is a mechanism for translating IPv6 packets to IPv4 packets and vice-versa – The translation is done by translating the packet headers according to the IP/ICMP Translation Algorithm. – The IPv4 addresses of IPv4 hosts are algorithmically translated to and from IPv6 addresses by using a specific algorithm. – The current specification only defines how stateful NAT64 translates unicast packets carrying TCP, UDP and ICMP traffic. – DNS64 is a mechanism for synthesizing AAAA resource records (RR) from A RR. The IPv6 address contained in the synthetic AAAA RR is algorithmically generated from the IPv4 address and the IPv6 prefix assigned to a NAT64 device • NAT64 allows multiple IPv6-only nodes to share an IPv4 address to access the IPv4 Internet
- 19. - 19 NAT64 (3) • It’s known that there are things that doesn’t work: – Everything out of TCP,UDP, or ICMP: Multicast, Stream Control Transmission Protocol (SCTP), the Datagram Congestion Control Protocol (DCCP), and IPSEC – Applications that carry layer 3 information in the application layer: FTP [RFC6384], SIP/H323 – Some apps: online gaming, skype, etc. • Peer-to-peer using IPv4 “references” – Literal addresses – Socket APIs
- 20. - 20 NAT64 (4) CPE Internet IPv4 ISP network NAT64 10.0.0.x/24 NAT64 CPE v4 v4 v6 v4/v6 Internet IPv6 ”plain” IPv6 IPv6-only access Public IPv4 NAT64 DNS64
- 21. - 21 NAT64 breaks … App Name Functionality Version 464XLAT Fixed connection tracker Broken NA NA DoubleTwist Broken 1.6.3 YES Go SMS Pro Broken NA YES Google Talk Broken 4.1.2 YES Google+ Broken 3.3.1 YES IP Track Broken NA NA Last.fm Broken NA YES Netflix Broken NA YES ooVoo Broken NA YES Pirates of the Caribean Broken NA YES Scrabble Free Broken 1.12.57 YES Skype Broken 3.2.0.6673 YES Spotify Broken NA YES Tango Broken NA YES Texas Poker Broken NA YES TiKL Broken 2.7 YES Tiny Towers Broken NA YES Trillian Broken NA YES TurboxTax Taxcaster Broken NA Voxer Walkie Talkie Broken NA YES Watch ESPN Broken 1.3.1 Zynga Poker Broken NA YES Xabber XMPP Broken NA *T-Mobile
- 22. - 22 464XLAT • 464XLAT (RFC6877): RFC6145 + RFC6146 • Very efficient use of scarce IPv4 resources – N*65.535 flows per each IPv4 address – Network growth not tied to IPv4 availability • IPv4 basic service to customers over an-IPv6 only infrastructure – WORKS with applications that use socket APIs and literal IPv4 addresses (Skype, etc.) • Allows traffic engineering – Without deep packet inspection • Easy to deploy and available – Commercial solutions and open source
- 23. - 23 464XLAT CPE CLAT Internet IPv4 ISP network NAT64 PLAT 10.0.0.x/24 NAT64 PLAT CPE CLAT 10.0.0.x/24 v4 v4 v4 v4/v6 Internet IPv6 “plain” IPv6 IPv6-only access NAT46 Public IPv4 DNS64NAT64
- 24. - 24 How 464XLAT works? CLAT PLAT ISP + IPv6 Internet Public IPv4Private IPv4 IPv4 Internet IPv4 + IPv6 IPv4 IPv6 IPv6 IPv6 Stateless (4->6) [RFC6145] Stateful (6->4) [RFC6146] CLAT: Customer side translator (XLAT) PLAT: Provider side translator (XLAT) IPv4 IPv6
- 25. - 25 Possible “app” cases ISP IPv6-only IPv6-only Internet 464XLAT ISP IPv6-only IPv4-only Internet 464XLAT PLAT DNS64/NAT64 ISP IPv6-only IPv4-only Internet 464XLAT PLAT 6->4 CLAT 4->6
- 26. - 26 464XLAT Addressing CLAT PLAT ISP + IPv6 Internet 200.3.14.147192.168.2.3 IPv4 Internet IPv4 + IPv6 IPv4 IPv6 IPv6 IPv6CLAT XLATE SRC prefix [2001:db8:abcd::/96] XLATE DST prefix [2001:db8:1234::/96] PLAT IPv4 pool (192.1.0.1 – 192.1.0.250) XLATE DST prefix [2001:db8:1234::/96] IPv4 IPv6 2001:db8:abcd::ab 2001:db8:dada::bb IPv4 SRC 192.168.2.3 IPv4 DST 200.3.14.147 Stateless XLATE [RFC6145] Stateful XLATE [RFC6146] IPv6 SRC 2001:db8:abcd::192.168.2.3 IPv6 DST 2001:db8:1234::200.3.14.147 IPv4 SRC 192.1.0.1 IPv4 DST 200.3.14.147
- 27. - 27 Availability and Deployment • NAT64: – A10 – Cisco – F5 – Juniper – NEC – Huawei – Jool, Tayga, Ecdsys, Linux, OpenBSD, … • CLAT – Android (since 4.3) – Nokia – Windows – NEC – Linux – Jool – OpenWRT – Apple (sort-of, is Bump-in-the-Host [RFC6535] implemented in Happy Eyeballs v2) - IPv6-only since iOS 10.2 • Commercial deployments: – T-Mobile US: +68 Millions of users – Orange – Telstra – SK Telecom – … – Big trials in several ISPs
- 28. - 28 MAP Encapsulation (MAP-E) • Mapping of Address and Port with Encapsulation • Is a “stateless” DS-Lite – Provision of an IPv4 prefix, address or “shared” address – Algorithmic mapping between IPv4 and an IPv6 address – Extends CIDR to 48 bits (32 IP + 16 port) • Allows encapsulating IPv4 in IPv6 for both mesh and hubs&spoke topologies, including mapping-independent IPv4 and IPv6 • Two elements: • MAP Customer Edge (CE) • MAP Border Relay (BR)
- 29. - 29 MAP-E CE Internet IPv4 ISP Network BR 10.0.0.x/24 BR CE 10.0.0.x/24 v4 v4 v4 v4/v6 Internet IPv6 “plain” IPv6 IPv6-only access IPv4-in-IPv6 tunnel NAT44 Level 1 Public IPv4
- 30. - 30 MAP-E Packet Path
- 31. - 31 MAP Translation (MAP-T) • Mapping of Address and Port using Translation • Similar to MAP-E • Similar to 464XLAT in the sense of the double translation NAT46 (CLAT) and NAT64 (PLAT)
- 32. - 32 MAP-T CE Internet IPv4 ISP Network BR 10.0.0.x/24 BR CE 10.0.0.x/24 v4 v4 v4 v4/v6 Internet IPv6 “plain” IPv6 IPv6-only access IPv4-in-IPv6 tunnel NAT46 Public IPv4 NAT64 NAT44 Level 1
- 33. - 33 MAP-T Packet Path
- 34. - 34 MAP-E vs MAP-T • MAP-E uses extra 20 bytes for the encapsulation (IPv4-in-IPv6 tunnel). IPv4 IPv6 Transport Link IPv4 Transport Link IPv4 Transport Link IPv6 Transport Link ó IPv4 CE BR MAP MAP MAP-E MAP-T … …Core IPv6
- 36. - 36 Comparing Transition … 6RD Softwires v2 NAT444 DS-Lite Lw4o6 NAT64 464XLAT MAP-E MAP-T Tunel/Translation (X) T 6in4 T 6in4 X T 4in6 T 4in6 X X T 4in6 X Dual-stack LAN YES YES optional YES YES NO YES YES YES IPv4 Multicast YES YES YES NO NO NO NO NO NO Access Network IPv4 IPv4 IPv4 /dual IPv6 IPv6 IPv6 IPv6 IPv6 IPv6 Overhead 20 bytes 40 bytes - 40 bytes 40 bytes 20 bytes 20 bytes 40 bytes 20 bytes Impact in IPv6 addressing plan YES NO NO NO NO NO NO YES YES CPE Update YES YES optional YES YES YES YES YES YES NAT44/NAPT CPE CPE CPE + CGN CGN CPE CPE CPE CPE CPE 46/64 Translation - - - - - ISP ISP +/or CPE - CPE + ISP Translation at ISP with or w/o state - - with - - with with w/o w/o Scalability High Medium Medium Medium High High High High High Performance High Low Low Low High Medium High High High ALGs NO NO YES YES NO YES YES YES YES Any Protocol or only-TCP/UDP/ICMP YES YES YES YES YES NO NO NO NO Sharing IPv4 Ports NO NO YES YES YES NO NO YES YES IPv6 Aggregation NO NO optional YES YES YES YES YES YES IPv4 Mesh YES YES YES NO NO NO NO YES YES IPv6 Mesh YES NO optional YES YES YES YES YES YES Impacts on logging NO NO YES YES NO YES YES NO NO HA simplicity High Low Low Low High Medium High High High DPI simplicity Low Low High Low Low High High Low High Support in cellular NO NO YES NO NO YES YES NO NO Support in CPEs YES YES YES YES YES YES YES YES YES 15.5 12.5 10.5 9.5 15 11.5 14 13 13.5
- 37. - 37 How many ports per user? • Possibly a minimum of 300 per user behind each CPE – More as AJAX/similar technologies usage increase – Times average number of users behind each NAT – And going up • Be aware of IP/port sharing implications …
- 38. - 38 Buying CGNs or IPv4 Addresses • You buy CGNs instead of IPv4 addresses – You start rotating the IPv4 pools at the CGNs because they get blocked after some time – Then you discover a couple of years after, that all your IPv4 addresses – Then you buy new addresses … • Why not buying the addresses (now that are cheaper and available) instead of buying the CGNs? https://www.ausnog.net/sites/default/files/ausnog- 2018/presentations/2.6_Phil_Britt_AusNOG2018.pdf
- 39. - 39 Recommended Reading • Basic Requirements for IPv6 Customer Edge Routers (RFC7084) – Originally include support only for 6RD and DS-LITE – Being updated to include support for 464XLAT, MAP T/E, lw4o6, … – https://datatracker.ietf.org/doc/draft-ietf-v6ops-transition-ipv4aas/ • BCOP RIPE690: – https://www.ripe.net/publications/docs/ripe-690 • Point-to-point links: – https://datatracker.ietf.org/doc/draft-palet-v6ops-p2p-links/ • NAT64 deployment guidelines: – https://datatracker.ietf.org/doc/draft-ietf-v6ops-nat64-deployment/
- 40. - 40 DNSSEC Considerations • DNS64 modifies DNS answers and DNSSEC is designed to detect such modifications, DNS64 can break DNSSEC • In general, DNS servers with DNS64 function, by default, will not synthesize AAAA responses if the DNSSEC OK (DO) flag was set in the query. In this case, as only an A record is available, it means that the CLAT will take the responsibility, as in the case of literal IPv4 addresses, to keep that traffic flow end-to-end as IPv4, so DNSSEC is not broken • Today no apps in cellular that use DNSSEC, but you should be ready for that – Consider apps used by means of tethering – Very relevant for non-cellular networks
- 41. - 41 Performance *FaceBook data (17/3/2015) US Mobile Performance – Dual Stack Provider iOS v6 v4 30% • iPhone 6 on LTE only • No Instrumentation of the client • Examining Client Last Byte Time • Time it takes for the device to read the response • Read all the data for a newsfeed Time of HTTP GET completion US Mobile Performance – Dual Stack Provider Android v6 v4 40% • Android 4/5 • Galaxy S5 on LTE only • No Instrumentation of the client • Examining Client Last Byte Time • Time it takes for the device to read the response • Read all the data for a newsfeed Time of HTTP GET completion US Mobile Performance – Dual Stack Provider iOS v6 v4 40% • iPhone 6 • Client instrumentation • No A/B testing • Mobile Proxygen • Examining Total Request Time • Similar to Client Last Byte Time Total Request Time
- 42. - 42 Multiservice Network … … 464XLAT PLAT DNS64/NAT64 … Cellular network 464XLAT Residential network Corporate network
- 43. - 43 Example Residential Customer … IPv4 + IPv6 2001:db8::/32 198.51.100.0/24 FE80::1/64 Internet LAN Eth1 192.168.1.1 2001:db8:40::41 CPE (CLAT) Pool IPv4/NAT46: 192.0.0.1/32 Pool IPv6: 2001:db8:2::40/128 2001:db8:1::2 WAN Eth0 Node 1 192.168.1.2/24 2001:db8:40::42/64 BRAS Eth0 198.51.100.10 2001:db8::10 VM PLAT (NAT64 + DNS64) Pool IPv4/NAT64: 198.51.100.11/32 Prefijo IPv6: 64:ff9b::/96 2001:db8:1::1 Eth1 ISP Network User Network Traffic Legend Red: IPv6-only Blue: IPv4-only Green: Dual-stack Node “n” 192.168.1.x/24 2001:db8:40::xx/64
- 44. - 44 NAT64, DNS64 Jool APRICOT 2019 / APNIC 47 February 2019 Daejeon, South Korea @JordiPalet (jordi.palet@theipv6company.com)
- 45. - 45 Jool • http://jool.mx/ • Open Source SIIT and NAT64 for Linux • SIIT (RFC7915): Stateless IP/ICMP Translation Algorithm – Just “translates 1:1” between IPv4 and IPv6 and back – SIIT with EAM (Explicit Address Mapping) allows “rules” • Stateful NAT64, is a NAT between both – So helps with IPv4 address exhaustion
- 46. - 46 Jool Defined Architectures • SIIT-DC • 464XLAT • SIIT-DC DTM (Dual Translation Mode)
- 47. - 47 Jool Features • Runs in Single Interface – if needed • “Node-Based Translation” – Using “namespaces” to “wrap” Jool • High-Availability – Daemon that allows constant synchronization of sessions across Jool instances
- 48. - 48 EAMT • Some examples: IPv4 Prefix IPv6 Prefix 192.0.2.1/32 2001:db8:aaaa::5/128 198.51.100.0/24 2001:db8:bbbb::/120 203.0.113.8/29 2001:db8:cccc::/125
- 49. - 49 Our Demo Setup … Internet LAN Eth1 100.64.0.1/10 2001:13c7:7003:1011::1 CPE (CLAT in VM) Pool IPv4/NAT46: 100.64.0.0/10 Pool IPv6: 2001:13c7:7003:1010::/106 2001:13c7:7003:1000::1/64 WAN Eth0 Node 1 100.64.x.x/10 2001:13c7:7003:1011::x/64 Eth0 200.0.86.254 001:13c7:7003:52::3/64 Ubuntu Router NAT64 + DNS64 Pool IPv4/NAT64: 200.0.86.254 Prefix IPv6: 64:ff9b::/96 2001:13c7:7003:1000::/52 DNS1: 2001:13c7:7003:1000::ffff 2001:13c7:7003:1000::ffff /64 Eth3 SSID: ipv6-lab pwd: lab-ipv6 Traffic Legend Red: IPv6-only Green: Dual-stack Node “n” 100.64.x.x/10 2001:13c7:7003:1011::x /64
- 50. - 50 Demo ping 1.1.1.1 tracert 1.1.1.1 ping www.google.com ping -4 www.google.com tracert6 www.google.com tracert www.google.com Also browse to web site that are/aren’t IPv6 enabled and with literals, for example http://1.1.1.1 In Chrome/Firefox you may want first to install extension “IPvfoo"
- 51. - 51 NAT64 Setup sudo service network-manager stop sudo service radvd stop sudo service isc-dhcp-server stop sudo service isc-dhcp-server6 stop sysctl -w net.ipv4.conf.all.forwarding=1 sysctl -w net.ipv6.conf.all.forwarding=1 ethtool --offload br-lan gro off lro off ethtool --offload eth0 gro off lro off ethtool --offload eth3 gro off lro off ip -6 route replace 2001:13c7:7003:1010::/60 via 2001:13c7:7003:1000::1 modprobe jool pool6=64:ff9b::/96 pool4=200.0.86.254
- 52. - 52 DNS64 Setup /etc/bind/named.conf.options ... forwarders { 8.8.8.8; 8.8.4.4; }; dns64 64:ff9b::/96 { clients { any; }; mapped { any; }; exclude { 0::/3; 4000::/2; 8000::/1; 2001:db8::/32; }; break-dnssec no; };
- 53. - 53 /etc/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet6 static autoconf 0 accept_ra 0 address 2001:13c7:7003:1000::1 netmask 64 gateway 2001:13c7:7003:1000::ffff dns-nameservers 2001:13c7:7003:1000::ffff auto eth1 iface eth1 inet static address 100.64.0.1 netmask 255.192.0.0 iface eth1 inet6 static autoconf 0 accept_ra 0 address 2001:13c7:7003:1011::1 netmask 64
- 54. - 54 CLAT Setup sudo service isc-dhcp-server start sudo service radvd start sudo stop network-manager sysctl -w net.ipv4.conf.all.forwarding=1 sysctl -w net.ipv6.conf.all.forwarding=1 sysctl -w net.ipv4.ip_forward=1 ethtool --offload eth0 gro off lro off ethtool --offload eth1 gro off lro off modprobe jool_siit pool6=64:ff9b::/96 jool_siit --eamt --add 100.64.0.0/10 2001:13c7:7003:1010::/106
- 55. - 55 Data-Centers without IPv4! SIIT-DC
- 56. - 56 Data-Centers without IPv4! • Several cases, large content providers with IPv6-only data-centers and more coming … • Many ways to do that – Load Balancing (cost, state, scalability) – IPv4 traffic (from Internet) finish in IPv6-only clusters • Same RFC1918 space, for IPv4 BGP sessions • RFC5549 – Advertising IPv4 Network Layer Reachability Information with an IPv6 Next Hop • IPv4 in IPv6 tunneling, for IPVS (IP Virtual Server) • IPv4 link-local (169.254.0.0/16) for Linux and switches
- 57. - 57 Advantages of IPv6-only • IPv6 traffic keeps going up – Initially more in cellular networks • This is a ”more expensive” traffic (radio, energy, bandwidth availability, …) • More expensive with IPv4 (“keepalives”) than with IPv6 • If the end-points speak IPv6 there is no NAT – Even better, no CGN • “performance” or ”user-perceived quality of service increases – IPv6 40% “faster” than IPv4 • Response time to complete “HTTP GET” • Using HTTP2 and QUIC can increase that performance
- 58. - 58 IPv4 or Dual-Stack? • Against IPv4: – Lack of IPv4 addresses – Overlapping of private addresses – NAT (state) – Renumbering (new servers or VMs) – Lack of IPv6 support • Against Dual-Stack: – ”Dual” management costs • Monitoring, security, human resources, errors, …
- 59. - 59 SIIT-DC • RFC7755 - SIIT-DC: Stateless IP/ICMP Translation for IPv6 Data Center Environments – “464XLAT” for the DC – No additional software in end-points • No state! – High availability: BGP, ECMP, … • Keeps source IPv4 address – Logging, geolocation, … • Avoid dual-stack in the DC – DC is simplified • Keeps dual-stack for Internet – Service is available for all users • IPv4-only, IPv6-only and dual-stack • Doesn’t work with literal addresses neither IPv4-only APIs – Not an issue: a DC use DNS! – Sorted out as well with RFC7756 • Stateless IP/ICMP Translation for IPv6 Internet Data Center Environments (SIIT-DC): Dual Translation Mode
- 60. - 60 Example of DC with SIIT-DC IPv6-only Data Center SIIT-DC BR SIIT-DC BR Internet IPv4 Internet IPv6
- 61. - 61 Mapping all the IPv4 Internet Internet IPv6 Internet IPv4 0.0.0.0/0 64:ff9b::0.0.0.0/96 • An EAM (Explicit Address Mapping) table is configured in the SIIT-DC BR Translation prefix: 2001:db8:46::/96 IPv4 pool: 192.0.2.0/24 EAM table: IPv4 Internet address Address in the DC 192.0.2.1 2001:db8:12:34::1 192.0.2.2 2001:db8:24:68::80 192.0.2.3 2001:db8:24:68::25
- 62. - 62 Traffic Flow • Example from IP 203.0.113.50 to 192.0.2.1 IPv4 -> IPv6 translation IPv4 IPv6 SRC: 203.0.113.50 2001:db8:46::203.0.113.50 DST: 192.0.2.1 2001:db8:12:34::1 IPv6 -> IPv4 translation IPv6 IPv4 SRC: 2001:db8:12:34::1 192.0.2.1 DST: 2001:db8:46::203.0.113.50 203.0.113.50
- 63. - 63 Support • Commercial: – A10 – Brocade – Cisco – F5 • Open Source: – Jool – Tayga – VPP