uname -a; # QNAP uses EXT4
    Linux QNAP 3.4.6 #1 Fri May 22 07:56:30 CST 2015 armv5tel unknown
    mount; # DATA is ext4
    /dev/md0 on /share/MD0_DATA type ext4 (rw,usrjquota=aquota.user,jqfmt=vfsv0,user_xattr,data=ordered,nodelalloc,noacl)
    nfsd on /proc/fs/nfsd type nfsd (rw)
    cat /proc/fs/nfsd/versions
    +2 +3 -4 -4.1
    cat /proc/fs/nfs/exports
    # Version 1.1
    # Path Client(Flags) # IPs
    /share/MD0_DATA/DATA         *(rw,insecure,no_root_squash,async,wdelay,no_subtree_check,uuid=60dd2e14:9a01561b:00000000:00000000)

    dmesg|grep nfs

    [ 66.638725] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
    [ 214.072501] NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory

    lsmod | grep nfs

    nfsd 231700 12 fnotify, Live 0xbf349000
    exportfs 2885 1 nfsd, Live 0xbf345000
    nfs 251340 0 - Live 0xbf2f2000
    auth_rpcgss 30572 2 nfsd,nfs, Live 0xbf2e4000
    lockd 59814 2 nfsd,nfs, Live 0xbf2cd000
    sunrpc 167759 14 nfsd,nfs,auth_rpcgss,lockd, Live 0xbf291000

mount; # client is using ext3

    /dev/sda5 on / type ext3 (rw,relatime,errors=remount-ro,data=ordered)

    dmesg|grep nfs
    [ 2.517324] FS-Cache: Netfs 'nfs' registered for caching
    [ 2.522955] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
    dmesg|grep NFS
    [ 2.509406] RPC: Registered tcp NFSv4.1 backchannel transport module.
    [13274.540947] NFS: Registering the id_resolver key type
    How share was mounted:
    # command used to mount the NFS share
    mount 192.168.1.123:/DATA /mnt/qnap;

    192.168.1.123:/DATA on /mnt/qnap type nfs         (rw,relatime,vers=3,rsize=32768,wsize=32768,namlen=255,hard,proto=tcp,timeo=60                0,retrans=2,sec=sys,mountaddr=192.168.1.123,mountvers=3,mountport=48394,mountproto=udp,local_lock=none,addr=192.168.1.123)
    binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)

    „This is a much-improved Linux NFS server with support for NFSv3 as well as NFSv2. NFSv4 is being worked on. These patches are considered stable and are indeed shipping with most distributions. The stock Linux 2.2 NFS server can’t be used as a cross-platform file server“