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my home network is behind a typical dsl router, with a dynamic ip address from my ISP.
Recently I never opened samba port (135/tcp, 139/tcp, 445/tcp) to my Linux server with samba daemon.
However, looking in the /var/log/samba directory, I found several log like this:
A log level above 4-5 seldom has any meaning to anyone except the Samba developers. Be aware that Samba broadcasts a lot of seemingly meaningless data, being the poorly designed MS protocol it is, so many lines in a level 9 log may be perfectly normal.
I normally log at level 2, and when debugging at level 4. Never had any reason to increase the level.
Believe me, if you are under attack, you WILL see something in the logs even at level 3.
Also, you also may want to know, that you can choose the level by class, like this:
debug class = yes # Displays the class in the log file. Class may be lanman, rpc_srv, etc.
log level = all:1 printdrivers:3 lanman:1 rpc_parse:2 rpc_srv:3 rpc_cli:2 passdb:2 sam:2 auth:2