Statistics on ethernet adapter, crc error count must be 0

[root@tsm01 ~]# ethtool -S ens1f0
NIC statistics:
     rx_packets: 242322916
     tx_packets: 263012523
     rx_bytes: 351060937283
     tx_bytes: 377174314358
     rx_pkts_nic: 242322916
     tx_pkts_nic: 263012523
     rx_bytes_nic: 352030228947
     tx_bytes_nic: 378238836900
     lsc_int: 3
     tx_busy: 0
     non_eop_descs: 0
     rx_errors: 0
     tx_errors: 0
     rx_dropped: 0
     tx_dropped: 0
     multicast: 36186
     broadcast: 239320
     rx_no_buffer_count: 0
     collisions: 0
     rx_over_errors: 0
     rx_crc_errors: 0
     rx_frame_errors: 0

[root@lnx01 ~]# yum install nfs-utils
[root@lnx01 ~]# firewall-cmd --zone=public --add-service=nfs --permanent
[root@lnx01 ~]# systemctl reload firewalld
[root@lnx01 ~]# cat /etc/exports
/data 190.168.1.0/24(rw,no_subtree_check,no_root_squash)

[root@lnx01 ~]# systemctl start rpcbind nfs-server
[root@lnx01 ~]# systemctl enable rpcbind nfs-server

When the NFS service starts, he do a exportfs command which validate the content of /etc/exports, and put it into /var/lib/nfs/etab

# cat /var/lib/nfs/etab
/data   190.168.1.0/24(rw,sync,wdelay,hide,nocrossmnt,secure,no_root_squash,no_all_squash,no_subtree_check,secure_locks,acl,no_pnfs,anonuid=65534,anongid=65534,sec=sys,secure,no_root_squash,no_all_squash)

[root@lnx01 ~]# yum install nfs-utils
[root@lnx02 ~]# systemctl start rpcbind
[root@lnx02 ~]# systemctl enable rpcbind
[root@lnx02 ~]# mount -t nfs -o vers=4 lnx01:/data /mnt
[root@lnx02 ~]# cat /etc/fstab
.....
lnx01:/data                /mnt                   nfs     vers=4,proto=tcp,soft   0 0

Note
For NFSv3 you need additionnal steps

https://computingforgeeks.com/configure-nfsv3-and-nfsv4-on-centos-7/

https://www.stephenrlang.com/2016/01/setup-nfsv4-on-centos/

In NFSv4 the concept is user@domainname, if there is no centralized usermapping, then the user will be mapped to the default user nobody or whatever user has been configured in /etc/idmapd.conf.

Clean the old mapping

# nfsidmap -c