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Replacing private lines with tunnels



Suppose gateway routers at several corporate sites are linked by a network of
private (dedicated) lines. OSPF is configured on these routers. Since each each
private line is a single IP subnet, OSPF would -automatically- accomplish
any-to-any connectivity between the gateway routers. Now suppose the private
lines are replaced by IPSec tunnels. Then any-to-any connectivity will be lost.
This is because router interfaces at tunnel endpoints will, in general, not
belong to the same subnet, so OSPF won't work.

So, what can be done to restore any-to-any connectivity between the gateway
routers? In particular, do people implement a form of static routing over
tunnels, i.e., direct the traffic coming out of one tunnel into another?

-- Sanjai

--
   Sanjai Narain
   Senior Research Scientist
   Telcordia Technologies
   Tel: +1 973 829 4515 Fax: +1 973 829 5888
   Email: narain@research.telcordia.com




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