[root@asm01 ~]# yum install cifs-utils -y
[root@asm01 ~]# man mount.cifs
sec=arg
Security mode. Allowed values are:

· none - attempt to connection as a null user (no name)

· krb5 - Use Kerberos version 5 authentication

· krb5i - Use Kerberos authentication and forcibly enable packet signing

· ntlm - Use NTLM password hashing

· ntlmi - Use NTLM password hashing and force packet signing

· ntlmv2 - Use NTLMv2 password hashing

· ntlmv2i - Use NTLMv2 password hashing and force packet signing

· ntlmssp - Use NTLMv2 password hashing encapsulated in Raw NTLMSSP message

· ntlmsspi - Use NTLMv2 password hashing encapsulated in Raw NTLMSSP message, and force packet signing

The default in mainline kernel versions prior to v3.8 was sec=ntlm. In v3.8, the default was changed to sec=ntlmssp.

If the server requires signing during protocol negotiation, then it may be enabled automatically. Packet signing may also be enabled automatically if it's enabled in /proc/fs/cifs/SecurityFlags.

​https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/mounting_an_smb_share#authenticating_to_an_smb_share_using_a_credentials_file​

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