[jcifs] problem with NbtAddress.getAllByAddress()

[ashish]

Ok, here's full dump.
Yeah, actually that IP is not part of my local subnet.So I am forced not to
divulge the IP..
I am not sending this query to a broadcast address.
destination IP is a unicast address.
Interestingly, I have written a small program in C which does nbtstat and it
is able to get all the info.



ETHER:  ----- Ether Header -----
ETHER:
ETHER:  Packet 30 arrived at 11:26:8.93
ETHER:  Packet size = 92 bytes
ETHER:  Destination = 0:50:54:ff:88:64,
ETHER:  Source      = 0:3:ba:c:ac:e,
ETHER:  Ethertype = 0800 (IP)
ETHER:
IP:   ----- IP Header -----
IP:
IP:   Version = 4
IP:   Header length = 20 bytes
IP:   Type of service = 0x00
IP:         xxx. .... = 0 (precedence)
IP:         ...0 .... = normal delay
IP:         .... 0... = normal throughput
IP:         .... .0.. = normal reliability
IP:   Total length = 78 bytes
IP:   Identification = 9921
IP:   Flags = 0x4
IP:         .1.. .... = do not fragment
IP:         ..0. .... = last fragment
IP:   Fragment offset = 0 bytes
IP:   Time to live = 255 seconds/hops
IP:   Protocol = 17 (UDP)
IP:   Header checksum = 8768
IP:   Source address = 10.0.100.79, sunblade
IP:   Destination address = XX.XX.XX, XX.XX.XX
IP:   No options
IP:
UDP:  ----- UDP Header -----
UDP:
UDP:  Source port = 61764
UDP:  Destination port = 137 (NBNS)
UDP:  Length = 58
UDP:  Checksum = 00EA
UDP:
NBT:  ----- Netbios Name Service Header -----
NBT:
NBT:  Type = Query Request
NBT:  Status = Success
NBT:  Transaction ID = 0x0004
NBT:  Flags Summary = 0x0110
NBT:     - Broadcast
NBT:     - Recursion Desired
NBT:  Question count = 1
NBT:  Answer Count = 0
NBT:  Name Service Count = 0
NBT:  Additional Record Count = 0
NBT:  Question Name = *..............[0]
NBT:  Question Type = 0x0021
NBT:  Question Class = 0x0001
NBT:
----- Original Message -----
From: Christopher R.Hertel <crh at ubiqx.mn.org>
To: ashish <ashishn at ntechra.com>
Cc: <jcifs at samba.org>
Sent: Monday, May 13, 2002 12:33 PM
Subject: Re: [jcifs] problem with NbtAddress.getAllByAddress()


> Ashish,
>
> Mike has already talked about the amount of information required to debug
> a problem.  It seems that you are very sensitive about privacy, which I
> can understand, but it is *very* difficult to debug problems without
> enough information to do comparisons.
>
> In the dump below, the only potential problem I see is that the B
> (broadcast) bit is set, which is typically not the case for Node Status
> queries.  On the other hand, I'm not sure that it makes any difference.
> I tested against a pair of W/95 boxes at home and did not have any
> trouble.  I don't have W/XP to test against.
>
> Are you sending this query to a broadcast address?  Have you tried sending
> unicast queries using jCIFS?  If so, any difference?
>
> I know you don't want to give out IP addresses, but that is a bit of a
> problem too.  I can't see the IP header to know if you are sending to a
> broadcast address.  This is really very confusing.
>
> The other thing I would look for is a trace of the nbtstat exchange.  I
> can't see any differences (other than the B bit) between the trace below
> and what I would expect.  It would be worth-while to see what nbtstat
> sends in order to see if there *are* any differences.
>
> Chris -)-----
>
> On Mon, May 13, 2002 at 11:48:34AM -0700, ashish wrote:
> > Ok, here's sniffer output... when Node Status Request is send.
> > And I don't see any reply for this request from the remote machine......
> >
> >
> >
> > UDP:  ----- UDP Header -----
> > UDP:
> > UDP:  Source port = 61764
> > UDP:  Destination port = 137 (NBNS)
> > UDP:  Length = 58
> > UDP:  Checksum = 00EA
> > UDP:
> > NBT:  ----- Netbios Name Service Header -----
> > NBT:
> > NBT:  Type = Query Request
> > NBT:  Status = Success
> > NBT:  Transaction ID = 0x0004
> > NBT:  Flags Summary = 0x0110
> > NBT:     - Broadcast
> > NBT:     - Recursion Desired
> > NBT:  Question count = 1
> > NBT:  Answer Count = 0
> > NBT:  Name Service Count = 0
> > NBT:  Additional Record Count = 0
> > NBT:  Question Name = *..............[0]
> > NBT:  Question Type = 0x0021
> > NBT:  Question Class = 0x0001
> > NBT:
>
> --
> Samba Team -- http://www.samba.org/     -)-----   Christopher R. Hertel
> jCIFS Team -- http://jcifs.samba.org/   -)-----   ubiqx development,
uninq.
> ubiqx Team -- http://www.ubiqx.org/     -)-----   crh at ubiqx.mn.org
> OnLineBook -- http://ubiqx.org/cifs/    -)-----   crh at ubiqx.org
>