Hi, Thanks for your question. Try setting the file share with the FQDN and either anonymous or guest username. Enabling Kerberos may also help. [URL]   Let us know if you have any additional questions.
Looking for some help on creating an SMB share or NFS export where Chromebooks would have anonymous access to the folder or share. How do I get this to work as the Chromebooks will be going around AD security. Google indicated that the Guest local ID needs to be enabled and to also allow impersonation of the Guest user.
PowerScale/Isilon with Chromebooks