Optimal Routing of IP Packets
to Multi-Homed Servers
Multi-homing, or direct attachment to multiple networks, offers both
performance and availability benefits for important servers on busy
networks. Exploiting these benefits to their fullest requires a
modicum of routing knowledge in the clients. Careful policy control
must also be reflected in the routing used within the network to make
best use of specialized and often scarce resources. While relatively
straightforward in theory, this problem becomes much more difficult to
solve in a real network containing often intractable implementations
from a variety of vendors.
This paper presents an analysis of the problem and proposes a useful
solution for a typical campus network. Application of this solution
at the Stanford Linear Accelerator Center is studied and the problems
and pitfalls encountered are discussed, as are the workarounds used
to make the system work in the real world.
Presented at the 6th USENIX
Large Installation System Administration (LISA VI) Conference, Long
Beach, 19-23 October 1992.
Also published as SLAC-PUB-5895, which contains a few last-minute
corrections that didn't make it into the
This work supported by the United States Department of Energy
under contract number DE-AC03-76SF00515.
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