No write permission on NFS mount point

hi all
i have mounted one nfs mount point but i has no write permission on it.
when i am going to make a directory it is giving an error

# mkdir 1
mkdir: Failed to make directory "1"; Permission denied

i shared using command

# share -F nfs -o rw -d "backup" /backup
 
mounted using command 
mount -F nfs -o hard,rw,noac,sync,no_root_squash,rsize=32768,wsize=32768,suid,proto=tcp,vers=3  x.x.x.x:/backup /backup2

when i am using no_root_squash option it gives following error

# share -F nfs -o no_root_squash,rw -d "backup" /backup
share_nfs: invalid share option: 'no_root_squash'
 
# mount -F nfs -o hard,rw,noac,sync,no_root_squash,rsize=32768,wsize=32768,suid,proto=tcp,vers=3  x.x.x.x:/backup /backup2
mount: x.x.x.x:/backup on /backup2 - WARNING unknown option "sync"
mount: x.x.x.x:/backup on /backup2 - WARNING unknown option "no_root_squash"

i have check every where i dident get the solution.

no_root_squash is a Linux option, use root=client on Solaris to allow root access from the server named "client".

hi jlliagre thanks for your replay

 (root=client )

what should i use i place of client hostname or an ip address.

can you please share the synatx

 #mount -F nfs -o hard,rw,noac,sync,root="hostname/ipaddress",rsize=32768,wsize=32768,suid,proto=tcp,vers=3  x.x.x.x:/backup /backup2

can it will be like this?

an fqdn (eg: www.unix.com ) , domain name (eg: .unix.com) , netgroup, network name, network (eg: @192.168.1), or a colon separated list of these.