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A proper support for multimedia communications transport has to provide fault tolerance capabilities such as the preservation of established con- nections in case of failures. While multi-homing addresses this issue, the cur- rently available solution based in massive BGP route injection presents serious scalability limitations, since it contributes to the exponential growth of the BGP table size. Alternative solutions proposed for IPv6 fail to provide equivalent fa- cilities to the current BGP based solution. In this paper we present MEX (Muti- homing through EXtension header) a novel proposal for the provision of IPv6 multi-homing capabilities. MEX preserves overall scalability by storing alter- native route information in end-hosts while at the same time reduces packet loss by allowing routers to re-route in-course packets. This behavior is enabled by conveying alternative route information within packets inside a newly defined Extension Header. The resulting system provides fault tolerance capabilities and preserves scalability, while the incurred costs, namely deployment and packet overhead, are only imposed to those that benefit from it. An implemen- tation of the MEX host and router components is also presented.

Preserving Established Communications in IPv6 Multi-homed Sites with MEX