dos charset = cp866
unix charset = cp1251
workgroup = MKK
netbios aliases = nex
server string =
map to guest = Bad User
null passwords = Yes
log level = 3
log file = /var/log/samba/%m.log
max log size = 1500
unix extensions = No
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
load printers = No
disable spoolss = Yes
os level = 255
preferred master = Yes
domain master = Yes
dns proxy = No
wins support = Yes
Master browsing can be intercepted by other hosts with multiply adapters. I think they became Master Browser in their own network and send annouchments to my master browser and confuse Samba. When it happens, all hosts in workgroup are dissapear with the exception of my master browser and intercepter.
root@server:/var/log/samba# nmblookup -M MKK
added interface ip=192.168.0.5 bcast=192.168.15.255 nmask=255.255.240.0
querying MKK on 192.168.15.255
Got a positive name query response from 192.168.4.28 ( 172.16.0.1 169.254.15.50 )
Got a positive name query response from 192.168.7.47 ( 192.168.30.1 192.168.147.1 )
Got a positive name query response from 192.168.3.50 ( 192.168.13.72 )
Got a positive name query response from 192.168.0.5 ( 192.168.0.5 )
In most cases the intercepter is one of 4.28 7.47 3.50 . Now my temporary workaround is to block these hosts in INPUT chain of iptables ;(.
Addition: while Samba confused - smbclient -L *any_host* display my Samba server acting as master browser, but in Network Neighborhood i can see only my Samba host (and his alias) and one of Windows based PC (in most cases it's computer with installed firewall - it doesn't reply on ping, but replies on arping). Anyway blocking hosts with multiply adapters always works for me.
Sorry, i think problem was in second host with misconfigured samba.