RHEL 6 NFS client takes longer than a RHEL 5 NFS client to mount NFS exports

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Issue

In RHEL 5 if I do an ls it's very quick. In RHEL 6.2 it takes 30 seconds to list them.
RHEL 6 NFS client takes longer than a RHEL 5 NFS client to mount NetApp Filer exports. Tcpdump contains ICMP Destination unreachable (Port unreachable) after a UDP GETPORT Reply from the NetApp Filer.

Environment

Red Hat Enterprise Linux 6.2 (NFS Client)
NFSv3

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