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To: rsalles,AT,rsnetservices,DOT,com,DOT,br, CIPE <cipe-l,AT,inka,DOT,de>
Subject: Re: [Fwd: Re: tcpdump - laptop]
From: James Knott <james.knott,AT,rogers,DOT,com>
Date: Fri, 12 Sep 2003 12:50:10 -0400
In-reply-to: <50301.>
References: <50301.>

Renato Salles wrote:

[2003/09/11 21:59:45, 0] nmbd/nmbd.c:main(783)
  Netbios nameserver version 2.2.3a started.
  Copyright Andrew Tridgell and the Samba Team 1994-2002
[2003/09/11 21:59:45, 0] nmbd/nmbd_subnetdb.c:create_subnets(240)
  create_subnets: No local interfaces !


Did you see that?

An example of a running smb.conf here:

# Configure Samba to use multiple interfaces
# If you have multiple network interfaces then you must list them
# here. See the man page for details.
   interfaces =

I didn't know about that. I'll have to give it a try. It certainly appears to be a likely suspect. In OS/2, when using NetBIOS over TCP/IP, you only have to bind it to one adapter (it doesn't even have to be a real one). I had assumed the same to be true here. I just looked at the smb.conf man page and found:

"This option allows you to override the default network interfaces list that Samba will use for browsing, name registration and other NBT traffic. By default Samba will query the kernel for the list of all active interfaces and use any interfaces except that are broadcast capable."

As I read this, it should use any available interface that's broadcast capable. Perhaps this may have something to do with it. As I recall, ppp links are not normally broadcast capable.

My netmasks are correct, is the VPN tunnel range. The others are niks interconnected to win32 LAN's.

Well, it seems your samba is not running at all! It doesn't surprise me
you see nothing at with "nmap".

That was my mistake, I should have had smbd running, to be consistent with previous posts. However, smbd is the server and it's not necessary to be running it, in order to use the client. As I mentioned in earlier notes, sharing files from the notebook works fine. It's going in the other direction, sharing from the desktop system at home that's causing the problem. It's very strange in that it also occurs with shares from my OS/2 system and only via dial up. If I connect via wireless or directly to the input of my firewall, the problem doesn't occur. In all cases, the input to the firewall is via eth0. Nothing is changed on the firewall or desktop system, when changing connection methods.

Given that OS/2 shares also have the problem, it doesn't seem likely that it's a fault within the Samba server. Also, NFS shows similar problems. FTP works fine.

Given that it only happens with dial up, and not other connections that also pass through eth0, it's not likely to be a firewall issue.

Since everything is passing through an encrypted tunnel, it's unlikely that anything is being filtered by either ISP, though lost or delayed packets remain a possibility.

The problem is asymmetrical, even though identical software is used on all Linux systems. This again causes me to suspect lost or delayed packets. One difference, is that the packets from the server pass over a 100 Mb lan, before entering the VPN on the firewall. The data passing from the notebook, after entering the VPN, is sent directly to the ppp connection, which implies it's less likely to have packets lost or delayed, simply because it can't send them as fast as the server.

If I could get CIPE working on XP, that might offer some more clues.

All in all, it's a very *WEIRD* problem.

[2003/09/11 21:59:45, 0] nmbd/nmbd.c:main(861)
  ERROR: Failed when creating subnet lists. Exiting.

And log.smdb:

[2003/09/11 21:59:45, 0] smbd/server.c:main(698)
  smbd version 2.2.3a started.

The error on the last line of log.nmbd looks interesting.

Here's the last entry for log.nmbd on the server:

[2003/09/11 21:58:10, 0]
  Unable to find the Domain Master Browser name HOME<1b> for the
workgroup HOME.
  Unable to sync browse lists in this workgroup.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ For sure, there is not even a host connected running SMB-CIFS protocol.

Best regards,

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