It looks like my ISP hostname is used as LAN hostname (or soemthing like that...)
[master@hostnameISP log]$ cat nmb
2005/04/06 23:31:04 netbios nameserver version 1.9.18p10 started
Copyright Andrew Tridgell 1994-1997
Get_Hostbyname: Unknown host hostnameISP.
Unable to get my hostname - exiting.
[master@hostnameISP log]$