How to limit nfs share to a specific host

Hi all,
I used the following command in dfstab to limit sharing of a directory to a host called alert1.somedomain.com.
share -F nfs -o rw=alert1.somedomain.com /disk1/share
When I mount the directory in alert1, it can read the directory, but cannot write to the directory.
Thanks

Most likely the other security mechanisms are
blocking you, perhaps just a simple matter of
user permissions. Note that if you are trying to
do this as root on alert1, then you also need to
allow root in the share otherwise the root userid
is mapped to nobody.
-- richard

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