draft-engelstad-manet- name-resolution-00.txt IETF 57, Vienna MANET WG meeting Paal Engelstad, Telenor R&D / UniK

Problem Statement Need user-friendly way to address servers on ad- hoc network –Need Name Lookup (e.g. FQDN->IP-address) This draft focuses on on-demand ad-hoc networks Assumptions –Network is without infrastructure DNS not appropriate Need something similar to LLMNR /mDNS or Node Information Queries Need MANET-specific solution due to multi-hop –However, network might have external connectivity Should solution interoperate with DNS?

NOT Integrating Lookup with Route Discovery -> 3 Broadcasts (I) NR NS Name Requestor Name reSponder 1.Name Requestor broadcasts a name resolution request

2.Name reSponder Broadcasts a reply (because no return route has been formed). NOT Integrating Lookup with Route Discovery -> 3 Broadcasts (II) NR NS Name Requestor Name reSponder

NOT Integrating Lookup with Route Discovery -> 3 Broadcasts (III) NR NS Name Requestor Name reSponder 1.Name Requestor broadcasts a name resolution request 2.Name reSponder Broadcasts a reply (because no return route has been formed). 1.Name Requestor broadcasts a name resolution request. 2.Name reSponder Broadcasts a reply (because no return route has been formed). 3.Name Requestor broadcasts a RREQ to find a route to the resolved IP-address (because no forward route has been formed).

Integrating Lookup with Route Discovery -> 1 Broadcast (I) NR NS Name Requestor Name reSponder 1.Name Requestor broadcasts a name resolution request, carried by a RREQ routing header, which forms a return unicast route.

2.Name reSponder unicasts a reply back along the return route. It is carried back by a RREP routing header, which forms a forward route. Integrating Lookup with Route Discovery -> 1 Broadcast (II) NR NS Name Requestor Name reSponder

1.Name Requestor broadcasts a name resolution request, carried by a RREQ routing header, which forms a return unicast route. 2.Name reSponder unicasts a reply back along the return route. It is carried back by a RREP routing header, which forms a forward route. 3.Name Requestor may contact the resolved IP address along the forward route. Integrating Lookup with Route Discovery -> 1 Broadcast (III) NR NS Name Requestor Name reSponder

RREQ and RREP extension formats Forward Lookup (FQDN-> IP-address) –”NREQ extension” (i.e extension to RREQs): | Type | Length | Name (FQDN) –”NREP extension” (i.e. extension to RREPs): | Type | Length | Reserved | #Addrs | : IP Address (list) : | Name (FQDN) In addition: Reverse lookup and SRV-like lookup successfully implemented (but not yet in draft)

Interworking with External Networks A MANET gateway is a MANET node that is also a router or host on an external IP network A MANET Gateways might proxy query to DNS on external network and inject the result back into the MANET

Future work Response Selection Rules –Responses from node present on MANET, prioritized over proxy- responses from gateway –Prioritize resolved IP addresses to which the best route exists Caching by intermediate nodes –Intermediate nodes cache name resolution information appearing in NREPs that they are forwarding. –Only respond with cached information when a route to the resolved IP address is valid. AODV: Gratuitous RREP? –successfully implemented but not yet in the draft For other proposed mechanisms and details, please refer to the draft See also:

Questions? Thank you for your attention!