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[ns] routing



Hi,
I have to make a topology like the following:
       n1
     /     \
 n0--------n2
where the forward traffic goes through the path n0-n1-n2 and the return traffic (ACKs) through n2-n0.
All links are bidirectional, so the ns "decides" to use the path n0-n2 (as shortest in hops) for both forward and return traffic.
 
My idea was to set link costs , so to force the scheme I want, which worked well.
Any further ideas?
Are the link costs static (they do not change whatever may happen) or dynamic?
 
Thanks in advance
Fotis Tsironis