NSDI '06 Abstract
Pp. 267280 of the Proceedings
OCALA: An Architecture for Supporting Legacy Applications over
Dilip Joseph and Jayanth Kannan, University of California, Berkeley; Ayumu Kubota, KDDI Labs; Karthik Lakshminarayanan and Ion Stoica, University of California, Berkeley; Klaus Wehrle, RWTH Aachen University
In order for overlays and new network architectures to gain real user
acceptance, users should be able to leverage overlay functionality
without any modifications to their applications and operating
We present our design, implementation, and experience
with OCALA, an overlay convergence architecture that achieves this
goal. OCALA interposes an overlay convergence layer below the
transport layer. This layer is composed of an overlay independent
sub-layer that interfaces with legacy applications, and an overlay
dependent sub-layer that delivers packets to the overlay. Unlike
previous efforts, OCALA enables: (a) simultaneous access to
multiple overlays (b) communication between hosts in different
overlays (c) communication between overlay hosts and legacy hosts (d)
extensibility, allowing researchers to incorporate their overlays into
We currently support five overlays, i3,
RON, HIP, DOA and OverDoSe
on Linux, Windows XP/2000 and Mac OS X.
We (and a few other research groups and end-users) have used
OCALA for over a year with many legacy applications ranging from web
browsers to remote desktop applications.
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