samba over multiple subnets

Johan Björk johan at
Fri May 12 14:50:07 GMT 2000

I'm sure this issue have been discussed in this list far too many times already... But I've been unable to find it, so...

My network is splitted in two subnets; one with public IP and one with private IP. The ones with a private IP are masqueraded on a Linux server, also running Samba and acting as a DNS. The two subnets are connected to the same hub, which in turn are connected to _one_ NIC on the Samba server. On that server there's two interfaces eth0 with the alias eth0:0.

How in earth can I get Samba to understand that it has to take care of NetBIOS names on _BOTH_ those interfaces?!

This is the config: <-> <-> HUB -> firewall -> router

Samba/DNS/WINS on & smb.conf is wins enabled, has all the interfaces connected to it and is preferred master. With nmblookup I'm unable to find any NetBIOS name on the private network, while it works fine on the public. It is possible to connect with a UNC name to computers on both the subnets from the server with smbclient, tough, by some reason. Neither of the clients can talk across subnets, but they can talk to the server. So the conclusion must be that the server is refusing to pass requests/broadcasts through.

What should I do? Is it some issue with having the same network card on two subnets and IP-aliases? Is it some routing problem? route shows this:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface UH    0      0        0 eth0 U     0      0        0 eth0   U     0      0        0 eth0       U     0      0        0 lo         UG    0      0        0 eth0

Interface doesn't have a "eth0:0" in it as you can see... If it would make any difference. WINS is configured to the same server, with private/public IP, on all clients, so I would think that at least browsing should work... But it doesn't.

So what are the steps to take to make Samba work over two subnets?

Would love some help!

Johan Björk

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