[jcifs] no name with type 0x00 with no scope for host

Michael B Allen mballen at erols.com
Thu Feb 21 07:05:47 EST 2002

On Wed, 20 Feb 2002 11:09:30 -0800
"ashish" <ashishn at ntechra.com> wrote:

> hey, I called "getAllByAddress( "" )" .
> OK,  even if I don't set "jcifs.smb.client.laddr" property, it works for
> some dial up boxes.
> Just now I have put windows 98 box in dial up mode and it works fine and I
> have not set laddr property.

I'm not sure but you will have to set laddr to reliably get the right
interface for a PPP connection. Otherwise how whould a Java program
know what interface to use? Windows probably has some special corner
case code to ensure the netbios layer works. Or maybe it tries both. I
think PPP becomes the default when you dialup but a Java program started
*before* you dialup might not catch wind of that. I don't know a lot
about this. You'd be better off looking into Java networking over PPP
on desktops type of issues. This has nothing to do with jCIFS (unless
it's a bug but I have seen no evidence to that effect yet).

> Now some fuzzy observation. hey, don't blame me for confusing u further :-)
> Actually yday I was trying with XP box.and it did not work for sometime.
> "nbtstat -A" was working fine though..
> After sometime, even jcifs code started working.And to be frank, I am also
> confused thoroughly..
> I made no change in the code... except that I set "jcifs.smb.client.laddr"
> property to ip address of WAN interface.
> It did not work then too.

You want to set laddr to the LOCAL interface of the network that you
want to connunicate with. If for example you want to contact a host at
the other end of a dialup connection you would set this to the local
interface of your PPP connection.

> then i removed the setting for "jcifs.smb.client.laddr". and after sometime,
> it started working..

See first paragraph.

> Now one more question.. if I am polling all IP Addresses of a subnet , i
> really don't know which IP is a dial up .
> So how do i differentiate between IPs and set "jcifs.smb.client.laddr"
> property accordingly.

You want to set the LOCAL ip of PPP.

> I know I need not do such things for "nbtstat -A"...

That's because it is in a much better position to know what interfaces
to try then a Java program. You need to learn more about PPP and how it
interacts with a LAN connection.

You're proabably going to have to do System.exec:

C:\> ipconfig -a

and snarf the ppp interface IP out of that output.

It would also be much more effective to just download MP3s using Morpheous
than breaking into dialup connections.


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