Use "nfsstat -m" na máquina do cliente. Vai mostrar algo assim:
# nfsstat -m
localhost:/ on /net/localhost
nfsv3,tcp,resvport,hard,intr,cto,lockd,sec=sys,acdirmin=3,acdirmax=60,acregmin=5,ac
regmax=60,nametimeo=60,negnametimeo=60,rsize=65536,wsize=65536,readdirsize=65536,re
adahead=1,wcommitsize=8388608,timeout=120,retrans=2