1. 1 Name Service in IPv6 Mobile Ad-hoc Network connected to the Internet Jaehoon Jeong, ETRI paul@etri.re.kr http://www.adhoc.6ants.net/~paul/ PIMRC 2003

2. 2 Contents Introduction Related Work Name Service within IPv6 MANET Ad-hoc Name Service System (ANS) Name Service for the Internet Procedure of DNS Name Resolution Conclusion

3. 3 Introduction Name Service in Mobile Ad-hoc Network(MANET) MANET has dynamic network topology Current DNS can not be adopted in MANET!  Because it needs a fixed and well-known name server Idea of Name Service in MANET All the mobile nodes take part in name service  Every mobile node administers its own name information  It responds to the other node’s DNS query related to its domain name and IP address

4. 4 Related Work (1/2) : Link-Local Multicast Name Resolution (LLMNR) DNS service based on IP multicast in link-local scoped network IETF DNSEXT working group item Each node performs the role of DNS name server for its own domain name. LLMNR SenderLLMNR Responder LLMNR query message (What is IPv6 address of “host.private.local.”?) - It is sent in link-local multicast LLMNR response message (IPv6 address of “host.private.local.”) - It is sent in link-local unicast Verification of LLMNR response - Does the value of the response conform to the addressing requirements? - Is hop-limit of IPv6 header 1? If the result is valid, then the Sender caches and passes the response to the application that initiated DNS query. else the Sender ignores the response and continues to wait for other responses.

5. 5 Related Work (2/2) : Autoconfiguration Technology IP Interface Configuration Name Service Translation between host name and IP address Generation of unique domain name IP Multicast Address Allocation Service Discovery Unicast Service Multicast Service Autoconfiguration Technology IP Interface Configuration Name Service Service Discovery IP Multicast Address Allocation

6. 6 Ad-hoc Name Service System for IPv6 MANET (ANS) ANS provides Name Service in MANET MANET DNS Domain ADHOC. MANET IPv6 Prefix IPv6 Site-local Prefix  FEC0:0:0:0::/64 Architecture of ANS System ANS Responder It performs the role of DNS Name Server ANS Resolver It performs the role of DNS Resolver

7. 7 ANS System (1/2)

8. 8 ANS System (2/2) Main-Thread DUR-Thread ANS Zone DB ANS Responder Process Thread Database Memeory Read / Write Internal Connection Main-Thread Resolv-Thread Timer-Thread ANS Cache ANS Resolver Process Thread Cache UNIX Datagram Socket Memeory Read / Write Internal Connection Application ANS API DNS Query DNS Response DNS Query / DNS Response UDP Socket Connection

9. 9 Name Service in ANS Name Generation generates a unique domain name based on the network device identifier Zone File Generation generates ANS zone file with the unique domain name and corresponding IPv6 address Name Resolution performs the name-to-address translation Service Discovery performs the service discovery through DNS SRV resource record, which indicates the location of server or the multicast address of the service

10. 10 Scenario of Name Service within MANET MN-A MN-B MN-C DNS Query Message (MN-C.ADHOC.) DNS Query Message is sent in Multicast Receipt of DNS Query Message Request of Host DNS Name Resolution Receipt and Process of DNS Query Message DNS Response Message (MN-C’s IPv6 Address) Gain of DNS Information MN-A tries to connect to the server on MN-C The server on MN-C accepts the request of the connection from MN-A DNS Query Message (MN-C.ADHOC.) DNS Response Message is sent in Unicast

11. 11 Name Service for the Internet When a MANET Node communicates with an Internet Node, MANET Node should find out Internet Gateway(s). MANET Node should resolve the Internet Node’s DNS name into its globally routable IPv6 address. Discovery of Internet Gateway RS/RA-based Discovery Discovery of Global DNS Server Recursive DNS Server (RDNSS) Option within RA

12. 12 Discovery of Internet Gateway (IGW) & Recursive DNS Server (RDNSS) RA Header Prefix Information Option : IGW2’s Global IPv6 Prefix RDNSS Option : RDNSS3’s MANET Address RA Message from IGW2

13. 13 Procedure of DNS Name Resolution

14. 14 Conclusion ANS ( Ad-hoc Name Service System for IPv6 MANET ) A new name service scheme in IPv6 MANET connected to the Internet. Name Service of ANS Automatic name generation Automatic zone file generation Name-to-address translation Name Resolution of MANET Node Name Resolution of Internet Node Service discovery Future Work We will enhance ANS to provide secure name service. Authentication of DNS response message  through Pre-shared group key and IPsec ESP’s null-transform or  through Pre-shared group key and DNS TSIG (RFC2845) TSIG : Secret Key Transaction Authentication for DNS