Mobile IPv4 Traversal Across NAT and VPN Gateways

摘要

Wireless LANs or hot spots are starting to be widely deployedin Enterprise Intranets and public areas such as airports,coffee shops, shopping malls etc. based on IPv4. This combinedwith the availability of multi-mode networked devices andapplications that can take advantage of continuous mobility andconstant reachability, is driving the need for Mobile IP inthese networks. At the same time, middleboxes (NAT and VPNgateways for example) are also seeing widespread usage. MobileIPv4 has known functional and performance limitations in thepresence of these middleboxes. This draft proposes a solutionframework that enables seamless operation of Mobile IPv4 acrossmiddleboxes without requiring any changes to the middleboxesthemselves. Although the solution is generically extensible, the draft specifically focuses on NAT and VPN traversal. Thesolution has no link layer dependencies and can be applied toother 802.3-compatible physical media as well.