I have a computer B that can not send to computer A
when computer A don't have its ethernet card in promisc mode.

A has ip 10.2.0.1
  and ip 10.1.0.1
B has ip 10.2.0.2

a route is added on B to rediected traffic for 10.1.0.x
to eth0

a route is added on A to rediected traffic for 10.2.0.x
to eth0

a route is added on A to rediected traffic for 10.1.0.x
to eth0



ping from B to 10.2.0.1 works
ping from B to 10.1.0.1 does not

turn on promisc mode on ethernet card A
and ping from B to 10.1.0.1 does.

I have kernel 2.0.37, what makes the
routing work when the promisc mode is on?


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