1 / 9

NAT Traversal for LISP Mobile Node

NAT Traversal for LISP Mobile Node. Dominik Klein, Matthias Hartmann, and Michael Menth. Overview. Problem: Communication through NAT Solution: NAT traversal mechanism Idea Flow charts Summary & discussion. Problem: Communication through NAT. Observation

binah
Download Presentation

NAT Traversal for LISP Mobile Node

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. NAT Traversal for LISP Mobile Node Dominik Klein, Matthias Hartmann, and Michael Menth

  2. Overview • Problem: Communication through NAT • Solution: NAT traversal mechanism • Idea • Flow charts • Summary & discussion

  3. Problem: Communication through NAT • Observation • MN roams in domain with private addresses • Problem • MN registers private address as RLOC at mapping service • MN reachable only within own domain MS Internet LISP domain Non-LISP domain • NAT • 17.87.7.2 MN EID 1 10.0.0.1 ? ITR/ETR RLOC B SN EID 2

  4. Solution: NAT Traversal Router • NAT traversal router (NTR) • NTR collocated with map server (MS) • MN registers at NTR • NTR adds own RLOC for MN in MS • Traffic from outside tunneled from NTR to MN through NAT MS NTR RLOC N Internet Non-LISP domain MN EID 1 10.0.0.1 Traffic for MN • NAT • 17.87.7.2

  5. Registration Process • Internal IP:Port External IP:Port Peer IP:Port • -------------------------------------------------------------------- • 10.0.0.1:4341 17.87.7.2:20321 RLOC N:4342 EID-to-IP:Port Mapping -----------------------------------EID 1 17.87.7.2 :20321 EID-to-RLOC Mapping ------------------------------ EID 1 RLOC N MS Internet Non-LISP domain MN EID 1 10.0.0.1 • NAT • 17.87.7.2 NTR RLOC N

  6. Incoming Traffic • Internal IP:Port External IP:Port Peer IP:Port • -------------------------------------------------------------------- • 10.0.0.1:4341 17.87.7.2:20321 RLOC N:4342 EID-to-IP:Port Mapping -----------------------------------EID 1 17.87.7.2 :20321 EID-to-RLOC Mapping ------------------------------ EID 1 RLOC N MS LISP domain Internet Non-LISP domain MN EID 1 10.0.0.1 SN EID 2 • NAT • 17.87.7.2 ITR/ETR RLOC B NTR RLOC N

  7. Outgoing Traffic • Observation • NTR not necessarily required as relay for outgoing traffic • Example: MN sends traffic to stationary node in other LISP domain using a direct tunnel to destination ETR LISP domain Internet Non-LISP domain MN EID 1 10.0.0.1 SN EID 2 ITR/ETR RLOC B • NAT • 17.87.7.2

  8. Summary & Discussion • Mobile nodes not reachable behind NAT • NAT traversal router (NTR) helps • Receives traffic for MN • Relays it through the NAT to the MN • Protocol implementation in Omnet++ • Discussion • Great for MN reachability?  Standardize it! • Security risk?  How to avoid it?

  9. References • LISP (http://tools.ietf.org/html/draft-ietf-lisp-05) • LISP-MN (http://tools.ietf.org/html/draft-meyer-lisp-mn-00) • LISP-INT (http://tools.ietf.org/html/draft-ietf-lisp-interworking-00) • Most recent version published on LISP mailing list • (http://www.ietf.org/mail-archive/web/lisp/current/msg01964.html) • LISP-NAT paper (http://www3.informatik.uni-wuerzburg.de/~menth/Publications/papers/Menth10-Sub-2.pdf) • LISP-NAT draft (http://tools.ietf.org/html/draft-klein-lisp-mn-nat-traversal-00)

More Related