communication between mongo DB machines

[Syed Mehdi]

Hi,
we have two data centers (Say "A" and "B") and one replica set with 5 members.
3 of its machines are in "A" and 2 are in "B". Till now everything was working fine,
but then network operator stopped imitation of communication from "B" to "A" (though "A" to "B" is still allowed).
now our 2 machines (in "B") are shown as down in replica set status (checked on DB machine of "A").

since primary is in "A", and "A" to "B" initiated communication is allowed, shouldn't the 2 machine show up as fine?

also how can we deal with such a problem, if network operator will keep this rule and we still have to have machines in "A" and "B".

thanks for any help
syed