On Nov 5, 2009, Sam Hartman wrote:
There are a number of ways to do this, including hashing the six-tuple
(five tuple plus flow ID) to choose an exit.
Yes, this is an alternative to what is described in the paper I referred
to. It is an interesting idea actually.
None of this allows you to fail over a connection.
Correct. Another question is whether session failover is a requirement.
This may depend on the type of network we look at. In some networks,
if failovers happen infrequently, a simple solution that causes some
sessions to break in the event of a failover may actually be acceptable.
All this requires extra intelligence in applications, of course: for NAT
traversal, and potentially for automated session re-establishment. But
one may argue that applications require this functionality already
today.
- Christian
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