I think this is a bug:
CentOS 5.4 using Samba 3.4.7. If the server IP address changes, nmbd
complains every few minutes that "There is already a domain master
browser" on the old IP address.
Although "Chapter 41. Managing TDB Files" states:
wins.dat N WINS database iused only when wins support = yes has been
set. This gets rebuilt or updated at every restart.
that does not appear to be the case, since manually deleting wins.dat
and restarting Samba makes the problem go away.
Steps to reproduce:
Server IP address 10.32.1.201 running Samba:
# rpm -qa samba3\* libsmb\* libwb\* kernel
samba3-client-3.4.7-42.el5
samba3-cifsmount-3.4.7-42.el5
samba3-3.4.7-42.el5
samba3-doc-3.4.7-42.el5
libwbclient0-3.4.7-42.el5
samba3-winbind-3.4.7-42.el5
kernel-2.6.18-164.15.1.el5
# service smb status
smbd (pid 2591 2548) is running...
nmbd (pid 2552 2551) is running...
# ip addr list up
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
qlen 1000
link/ether 00:0c:29:dd:52:71 brd ff:ff:ff:ff:ff:ff
inet 10.32.1.201/24 brd 10.32.1.255 scope global eth0
inet6 fe80::20c:29ff:fedd:5271/64 scope link
valid_lft forever preferred_lft forever
# testparm -s | grep interfaces
interfaces = 10.32.1.201/255.255.255.0
Now change the server's IP address by editing ifcfg-eth0 and smb.conf to
change 10.32.1.201 to 10.32.1.200. Reboot the server.
# service smb status
smbd (pid 2591 2548) is running...
nmbd (pid 2552 2551) is running...
# ip addr list up
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
qlen 1000
link/ether 00:0c:29:dd:52:71 brd ff:ff:ff:ff:ff:ff
inet 10.32.1.200/24 brd 10.32.1.255 scope global eth0
inet6 fe80::20c:29ff:fedd:5271/64 scope link
valid_lft forever preferred_lft forever
# testparm -s | grep interfaces
interfaces = 10.32.1.200/255.255.255.0
# ping 10.32.1.201
PING 10.32.1.201 (10.32.1.201) 56(84) bytes of data.
>From 10.32.1.200 icmp_seq=1 Destination Host Unreachable
...
Every few minutes, nmbd logs the following in /var/log/messages:
Apr 27 13:38:20 16test nmbd[2551]: [2010/04/27 13:38:20, 0]
nmbd/nmbd_become_dmb.c:337(become_domain_master_browser_wins)
Apr 27 13:38:20 16test nmbd[2551]: become_domain_master_browser_wins:
Apr 27 13:38:20 16test nmbd[2551]: Attempting to become domain master
browser on workgroup WORKGROUP, subnet UNICAST_SUBNET.
Apr 27 13:38:20 16test nmbd[2551]: [2010/04/27 13:38:20, 0]
nmbd/nmbd_become_dmb.c:351(become_domain_master_browser_wins)
Apr 27 13:38:20 16test nmbd[2551]: become_domain_master_browser_wins:
querying WINS server from IP 10.32.1.200 for domain master browser name
WORKGROUP<1b> on workgroup WORKGROUP
Apr 27 13:38:21 16test nmbd[2551]: [2010/04/27 13:38:21, 0]
nmbd/nmbd_become_dmb.c:235(become_domain_master_query_success)
Apr 27 13:38:21 16test nmbd[2551]: become_domain_master_query_success:
Apr 27 13:38:21 16test nmbd[2551]: There is already a domain master
browser at IP 10.32.1.201 for workgroup WORKGROUP registered on subnet
UNICAST_SUBNET.
Shut down Samba, delete wins.dat, and restart Samba. Messages
disappear.
Moray.
"To err is human. To purr, feline"
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