An on Demand IPv4/IPv6 Multicast Translator
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1 An on Demand IPv4/IPv6 Multicast Translator Tudor Mihai BLAGA, V.DOBROTA, F.SZASZ & R.VIDRASCU Technical University of Cluj-Napoca, Romania 1
2 AGENDA INTRODUCTION EXISTING PROPOSALS MTP UNINETT TRANSLATOR ARCHITECTURE IMPLEMENTATION DETAILS CONFIGURATION ISSUES TEST ARCHITECTURE TRANSLATION DELAY CONCLUSION 2
3 1. INTRODUCTION 3
4 INTRODUCTION Context transition to IPv6 IPv4/IPv6 nodes only IPv4 nodes only IPv6 nodes Mechanism for direct communication between IPv4 and IPv6 nodes Unicast -dual-stack servers Multicast source streams to both IPv4 and IPv6 group Translation device on the path between the source and destination 4
5 2. EXISTING PROPOSALS 5
6 EXISTING PROPOSALS Transport Relay Translator (TRT) An IPv6-to-IPv4 Transport Relay Translator RFC only TCP => unicast Stateless IP/ICMP Translation Algorithm (SIIT) RFC 2765 E. Nordmark 2000 IPv4 embedded IPv6 address 0::ffff:0:a.b.c.d => unicast Multicast translation mechanisms: Multicast Translator Proxying (MTP) An IPv6/IPv4 Multicast Translator based on IGMP/MLD Proxying draft-ietf K. Tsuchiya 2002 UNINETT An IPv4-IPv6 Multicast Gateway S. Venass
7 MTP-MULTICAST TRANSLATOR PROXY Uses: IGMP Internet Group Management Protocol for IPv4 MLD Multicast Listener Discovery for IPv6 "IPv4-compatible" IPv6 multicast group address ffxy::ipv4multicast_address/96 Two translation modes: gateway header conversion router Disadvantages configuration by the domain administrator only small-scale networks 7
8 UNINETT Uses: IGMP Internet Group Management Protocol for IPv4 MLD Multicast Listener Discovery for IPv6 "IPv4-compatible" IPv6 multicast group address ffxy::ipv4multicast_address/96 PIM-SM (Protocol Independent Multicast Sparse Mode) for IPv6 Translates SAP/SDP (Session Announcement Protocol / Session Description Protocol) messages Disadvantages: IPv6 multicast is translated even if there are no IPv4 receivers for it 8
9 3. TRANSLATOR ARCHITECTURE 9
10 TRANSLATOR ARCHITECTURE Uses: IGMP Internet Group Management Protocol for IPv4 MLD Multicast Listener Discovery for IPv6 PIM-SM for both IPv6 and IPv4 domains Multicast address: "IPv4-compatible" IPv6 multicast group address arbitrary mappings between IPv4-IPv6 group addresses SAP/SDP messages are also translated Translator location: on the edge between IPv4/IPv6 domains on the same link as the RP (Rendezvous Point) 10
11 TRANSLATOR ARCHITECTURE 11
12 4. IMPLEMENTATION DETAILS 12
13 IMPLEMENTATION DETAILS Separate modules: IPv4 to IPv6 translation IPv6 to IPv4 translation can be used independently bidirectional translation requires the use of both modules on the same node on different nodes => fault tolerance Implementation under Windows OS using Microsoft Visual Studio 2005 Windows service functionality 13
14 IMPLEMENTATION DETAILS IPv6 translator 14
15 IMPLEMENTATION DETAILS IPv4 translator 15
16 5. CONFIGURATION ISSUES 16
17 CONFIGURATION ISSUES Configuration file fisierod.conf <Configuration file of the service. Do not change the order of the parameters> IPv6 local address: 2001::1:3 IPv6 multicast address: FF0E::4444 IPv4 local address: IPv4 multicast address: IPv6 Port: 4444 IPv4 Port: 5555 IPv6 SAP address: FF0E::2:7FFE IPv4 SAP address: SAP Port: 9875 PIM address: PIM Listener Port:
18 6. TEST ARCHITECTURE 18
19 TEST ARCHITECTURE IPv6 to IPv4 translator testbed two IPv4 PIM-SM routers with XORP (extensible Open Router Platform) VLC Media Player to send multicast content Wireshark for traffic capture Correct translation checked by comparing original IPv6 packet with IPv4 packet for: multicast data SAP/SDP messages Similar testbed for IPv4 to IPv6 translation 19
20 TEST ARCHITECTURE 20
21 7. TRANSLATION DELAY 21
22 TRANSLATION DELAY Translation delay = the time elapsed from the moment a packet is received by the translator to the moment the packet is sent using a different IP version Average values: IPv6 to IPv4 multicast data ms SAP/SDP messages ms IPv4 to IPv6 multicast data ms SAP/SDP messages ms Difference between the two cases due to the use of two separate software modules 22
23 8. CONCLUSION 23
24 CONCLUSION New on demand translation mechanism design implementation Translation is started only on demand if IPv4/IPv6 receivers request it Windows implementation, previous proposal were implemented under Linux/FreeBSD Translation delay was determined slight differences between the two software modules values are negligible 24
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