[Samba] netbios name not found on clients

[Nick THOMPSON]

I've been using Samba for years, though I'm still no expert, and this
one has me stumped:

I have just upgraded from Mandrake9.1->9.2 which changes from Samba
2.2.7a to 2.2.8a. I am using the same smb.conf file (see below). I can
still mount shares okay (though I do have a printing issue I haven't
looked at yet) but only by ip address. e.g \\10.0.0.3\nick works but
\\ratbert\nick does not. (BTW I'm using an Ethernet)

On the Linux box:

[nick at ratbert nick]$ nmblookup -M -
querying __MSBROWSE__ on 10.0.0.255
10.0.0.3 __MSBROWSE__<01>
10.0.0.3 __MSBROWSE__<01>
[nick at ratbert nick]$ nmblookup ratbert
querying ratbert on 10.0.0.255
10.0.0.3 ratbert<00>
10.0.0.3 ratbert<00>
[nick at ratbert nick]$ nmblookup HOME
querying HOME on 10.0.0.255
10.0.0.3 HOME<00>
10.0.0.3 HOME<00>
[nick at ratbert nick]$ smbclient //ratbert/nick
added interface ip=10.0.0.3 bcast=10.0.0.255 nmask=255.255.255.0
Password:
Domain=[HOME] OS=[Unix] Server=[Samba 2.2.8a]
smb: \>

No problems there. Both smbd and nmbd are running. log.nmbd says:

  Samba name server RATBERT is now a local master browser for workgroup
HOME on subnet 10.0.0.3

So how come I can't use the netbios name from my Win98 box any more?

Thanks,
Nick.

[global]
        netbios name = RATBERT
        workgroup = HOME
        server string = Samba Server %v
        encrypt passwords = Yes
        log file = /var/log/samba/log.%m
        max log size = 50
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
        printcap name = cups
        dns proxy = No
        printer admin = @adm
        printing = cups
        security = user

[homes]
        comment = Home Directories
        read only = No
        browseable = No

-- 
Nick THOMPSON <nickthompson at agere.com>
Agere Systems