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high ports filtered?

We have closed tcp/udp ports 32750-32800 which are apparently
used by nfs/rpc via portmapper.
Now some client-side udp services don't work on
some machines, eg, dns and asp queries (to outside), since they
originate on these high numbered ports.
How can one influence the client-side ports used,
or should one narrow the range of closed udp nfs/rpc ports?

-Igor Mozetic

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