Proposal for extending 'netbios aliases' to 'netbios virtual hosts'
kshaikh at consensys.com
Wed Jan 29 16:55:55 GMT 2003
Hello all(I'm a new face here),
Currently netbios aliases are bcast registered on every subnet on a
multihomed box if samba is operating as a B-node. If it's operating as a
P-node, then I assume samba will just use the interface where a WINS
server is reachable(I haven't examined the code on this part, so I'm
really ASSuming here).
Now on our multihomed box, if we have only one IP per subnet, then a
netbios name/alias is registered with that only that IP which is all
fine and dandy. But in the case where you have multiple IPs per subnet,
there is no clear cut way of telling samba, "I want SALES to be mapped
to 192.168.1.1 and DEVELOPMENT to be mapped to 192.168.1.2".
In my case, I get multiple IPs on a subnet through virtual IPs. So in
Linux I have eth0, eth0:1, eth0:2. Let's attach some numbers to them
for illustration: eth0 = 192.168.2.1, eth0:1 192.168.2.101, and eth0:2
192.168.2.102. Now if such a configuration exists, nmbd when operating
as a B-node, will only register names and aliases on eth0, not on the
eth0:1 or eth0:2 virtual interfaces.
What I propose is changing netbios aliases to simple netbios virtual
hosts, where I can specify netbios name/IP mappings. So a sample
configuration item would be:
interfaces = 192.168.2.0/255.255.255.0
virtual netbios hosts = SALES/192.168.2.101 DEVELOPMENT/192.168.2.101
This would effectively register with WINS or through broadcast the
name/ip mapping, provided the IPs exist on the local machine. But is
this the best way to do it? Do I have massive holes in my knowledge that
make my proposed method utterly fail?
Why I would do this: in a clustered failover environment, it's very
useful to have the concept of virtual hosts for HA applications.
Currently, I'm working off the 2.2.7a release branch.
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