Neighbour Table Overflow on NFS Server

Neighbour Table Overflow on NFS Server

[Navin Boppuri]

Hello,

I have been debugging my custom 823 board. I have an NFS Server setup on
which my kernel on the board mounts. I have using this server without any
problems for more than a month. All of the sudden, my NFS Server complains
of "Neighbour Table overflow" . The NFS Server was not modified, nor
restarted. The error also says that the Server returned error -5.  Can
someone suggest any remedy for this problem?

Sincerely,
Navin Boppuri


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: Neighbour Table Overflow on NFS Server

[Cal Erickson]

Navin,
 The message "neighbour table overflow" is the result of some
changes to the IP stack software in Linux version 2.2.x +. This
simply means that you are unable to connect to your NFS
server.  It may be related to the driver, but it may also be
related to other issues, such as NFS server not running or
incorrectly installed, no physical connectivity to NFS server,
etc.  Check the configuration of your NFS server and IP
network before diving into the driver.

Cal Erickson

Navin Boppuri wrote:

> Hello,
>
> I have been debugging my custom 823 board. I have an NFS Server setup on
> which my kernel on the board mounts. I have using this server without any
> problems for more than a month. All of the sudden, my NFS Server complains
> of "Neighbour Table overflow" . The NFS Server was not modified, nor
> restarted. The error also says that the Server returned error -5.  Can
> someone suggest any remedy for this problem?
>
> Sincerely,
> Navin Boppuri
>

--
===========================================================================
Cal Erickson                 MontaVista Software Inc.
Linux Consultant             1237 E. Arques Ave.
Phone (408) 328-0304         Sunnyvale CA 94085
Fax   (408) 328-9204         web http://www.mvista.com
===========================================================================


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: Neighbour Table Overflow on NFS Server

[Mark S. Mathews]

I may be completely off-base here, but I seem to recall getting some of
these a long time ago.  At the time I think it was cause by a lack of a
loopback device and routes.

-Mark

On Thu, 28 Dec 2000, Cal Erickson wrote:

>
> Navin,
>  The message "neighbour table overflow" is the result of some
> changes to the IP stack software in Linux version 2.2.x +. This
> simply means that you are unable to connect to your NFS
> server.  It may be related to the driver, but it may also be
> related to other issues, such as NFS server not running or
> incorrectly installed, no physical connectivity to NFS server,
> etc.  Check the configuration of your NFS server and IP
> network before diving into the driver.
>
> Cal Erickson
>
> Navin Boppuri wrote:
>
> > Hello,
> >
> > I have been debugging my custom 823 board. I have an NFS Server setup on
> > which my kernel on the board mounts. I have using this server without any
> > problems for more than a month. All of the sudden, my NFS Server complains
> > of "Neighbour Table overflow" . The NFS Server was not modified, nor
> > restarted. The error also says that the Server returned error -5.  Can
> > someone suggest any remedy for this problem?
> >
> > Sincerely,
> > Navin Boppuri
> >
>
> --
> ===========================================================================
> Cal Erickson                 MontaVista Software Inc.
> Linux Consultant             1237 E. Arques Ave.
> Phone (408) 328-0304         Sunnyvale CA 94085
> Fax   (408) 328-9204         web http://www.mvista.com
> ===========================================================================
>
>
>


Mark S. Mathews

AbsoluteValue Systems      Web:    http://www.linux-wlan.com
P.O. Box 941149            e-mail: mark@linux-wlan.com
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

RE: Neighbour Table Overflow on NFS Server

[Chris Hallinan]

Can't say I know exactly what it means (internally to the
kernel/driver) but we ALWAYS get this message when the
Ethernet cable is disconnected.  I would suspect physical
connections: check your cable,hub, etc.  In our experience,
it seems to indicate that the Ethernet driver is incapable
of completing transmit operations.

-Chris Hallinan

-----Original Message-----
From: owner-linuxppc-embedded@lists.linuxppc.org
[mailto:owner-linuxppc-embedded@lists.linuxppc.org]On Behalf
Of Mark S. Mathews
Sent: Friday, December 29, 2000 1:03 AM
To: Cal Erickson
Cc: Navin Boppuri; linuxppc-embedded@lists.linuxppc.org
Subject: Re: Neighbour Table Overflow on NFS Server


I may be completely off-base here, but I seem to recall
getting some of
these a long time ago.  At the time I think it was cause by
a lack of a
loopback device and routes.

-Mark

On Thu, 28 Dec 2000, Cal Erickson wrote:

>
> Navin,
>  The message "neighbour table overflow" is the result of
some
> changes to the IP stack software in Linux version 2.2.x +.
This
> simply means that you are unable to connect to your NFS
> server.  It may be related to the driver, but it may also
be
> related to other issues, such as NFS server not running or
> incorrectly installed, no physical connectivity to NFS
server,
> etc.  Check the configuration of your NFS server and IP
> network before diving into the driver.
>
> Cal Erickson
>
> Navin Boppuri wrote:
>
> > Hello,
> >
> > I have been debugging my custom 823 board. I have an NFS
Server setup on
> > which my kernel on the board mounts. I have using this
server without any
> > problems for more than a month. All of the sudden, my
NFS Server complains
> > of "Neighbour Table overflow" . The NFS Server was not
modified, nor
> > restarted. The error also says that the Server returned
error -5.  Can
> > someone suggest any remedy for this problem?
> >
> > Sincerely,
> > Navin Boppuri
> >
>
> --
>
============================================================
===============
> Cal Erickson                 MontaVista Software Inc.
> Linux Consultant             1237 E. Arques Ave.
> Phone (408) 328-0304         Sunnyvale CA 94085
> Fax   (408) 328-9204         web http://www.mvista.com
>
============================================================
===============
>
>
>


Mark S. Mathews

AbsoluteValue Systems      Web:    http://www.linux-wlan.com
P.O. Box 941149            e-mail: mark@linux-wlan.com
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: Neighbour Table Overflow on NFS Server

[Navin Boppuri]

Hello again,

I forgot to mention something. I sniffed the ethernet packets on the NFS
Server machine. I see that a request comes in from my custom board to the
NFS to the correct IP of the server. The HW Address of the board shows up
correctly, but the HW Address of the Server in the request shows up an 0.

ARP:
Request from:
211.111.21.41 -->  08:09:87:l0:73:16      // ethernet info of the custom
board
211.111.21.43 -->  00:00:00:00:00:00     // ethernet info of the nfs server

Does this look like some ARP problem? I am not sure about that since my TFTP
request for the zImage works just fine and the arp tables in the server show
up the board info correctly.

Any ideas?

----- Original Message -----
From: "Chris Hallinan" <clh@net1plus.com>
To: <nboppuri@trinetcommunication.com>
Cc: <linuxppc-embedded@lists.linuxppc.org>
Sent: Friday, December 29, 2000 12:46 PM
Subject: RE: Neighbour Table Overflow on NFS Server


>
> Can't say I know exactly what it means (internally to the
> kernel/driver) but we ALWAYS get this message when the
> Ethernet cable is disconnected.  I would suspect physical
> connections: check your cable,hub, etc.  In our experience,
> it seems to indicate that the Ethernet driver is incapable
> of completing transmit operations.
>
> -Chris Hallinan
>
> -----Original Message-----
> From: owner-linuxppc-embedded@lists.linuxppc.org
> [mailto:owner-linuxppc-embedded@lists.linuxppc.org]On Behalf
> Of Mark S. Mathews
> Sent: Friday, December 29, 2000 1:03 AM
> To: Cal Erickson
> Cc: Navin Boppuri; linuxppc-embedded@lists.linuxppc.org
> Subject: Re: Neighbour Table Overflow on NFS Server
>
>
> I may be completely off-base here, but I seem to recall
> getting some of
> these a long time ago.  At the time I think it was cause by
> a lack of a
> loopback device and routes.
>
> -Mark
>
> On Thu, 28 Dec 2000, Cal Erickson wrote:
>
> >
> > Navin,
> >  The message "neighbour table overflow" is the result of
> some
> > changes to the IP stack software in Linux version 2.2.x +.
> This
> > simply means that you are unable to connect to your NFS
> > server.  It may be related to the driver, but it may also
> be
> > related to other issues, such as NFS server not running or
> > incorrectly installed, no physical connectivity to NFS
> server,
> > etc.  Check the configuration of your NFS server and IP
> > network before diving into the driver.
> >
> > Cal Erickson
> >
> > Navin Boppuri wrote:
> >
> > > Hello,
> > >
> > > I have been debugging my custom 823 board. I have an NFS
> Server setup on
> > > which my kernel on the board mounts. I have using this
> server without any
> > > problems for more than a month. All of the sudden, my
> NFS Server complains
> > > of "Neighbour Table overflow" . The NFS Server was not
> modified, nor
> > > restarted. The error also says that the Server returned
> error -5.  Can
> > > someone suggest any remedy for this problem?
> > >
> > > Sincerely,
> > > Navin Boppuri
> > >
> >
> > --
> >
> ============================================================
> ===============
> > Cal Erickson                 MontaVista Software Inc.
> > Linux Consultant             1237 E. Arques Ave.
> > Phone (408) 328-0304         Sunnyvale CA 94085
> > Fax   (408) 328-9204         web http://www.mvista.com
> >
> ============================================================
> ===============
> >
> >
> >
>
>
> Mark S. Mathews
>
> AbsoluteValue Systems      Web:    http://www.linux-wlan.com
> P.O. Box 941149            e-mail: mark@linux-wlan.com
> Maitland, FL 32794-1149    Phone:  407.644.8582
> USA                        Fax:    407.539.1294
>
>
>


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: Neighbour Table Overflow on NFS Server

[Navin Boppuri]

Hello,

I seem to have solved my problem. I was working on some driver and while I
was setting up the interrupt stuff, I set up a wrong Interrupt Level, which,
I guess, was being used by the ethernet driver . This messed up the ethernet
driver and so the problems. I apologize to everyone for this. I appreciate
all the answers. I am totally new at writing drivers and hence, the hiccups.

Sincerely,
Navin Boppuri



>
> Hello again,
>
> I forgot to mention something. I sniffed the ethernet packets on the NFS
> Server machine. I see that a request comes in from my custom board to the
> NFS to the correct IP of the server. The HW Address of the board shows up
> correctly, but the HW Address of the Server in the request shows up an 0.
>
> ARP:
> Request from:
> 211.111.21.41 -->  08:09:87:l0:73:16      // ethernet info of the custom
> board
> 211.111.21.43 -->  00:00:00:00:00:00     // ethernet info of the nfs
server
>
> Does this look like some ARP problem? I am not sure about that since my
TFTP
> request for the zImage works just fine and the arp tables in the server
show
> up the board info correctly.
>
> Any ideas?
>
> ----- Original Message -----
> From: "Chris Hallinan" <clh@net1plus.com>
> To: <nboppuri@trinetcommunication.com>
> Cc: <linuxppc-embedded@lists.linuxppc.org>
> Sent: Friday, December 29, 2000 12:46 PM
> Subject: RE: Neighbour Table Overflow on NFS Server
>
>
> >
> > Can't say I know exactly what it means (internally to the
> > kernel/driver) but we ALWAYS get this message when the
> > Ethernet cable is disconnected.  I would suspect physical
> > connections: check your cable,hub, etc.  In our experience,
> > it seems to indicate that the Ethernet driver is incapable
> > of completing transmit operations.
> >
> > -Chris Hallinan
> >
> > -----Original Message-----
> > From: owner-linuxppc-embedded@lists.linuxppc.org
> > [mailto:owner-linuxppc-embedded@lists.linuxppc.org]On Behalf
> > Of Mark S. Mathews
> > Sent: Friday, December 29, 2000 1:03 AM
> > To: Cal Erickson
> > Cc: Navin Boppuri; linuxppc-embedded@lists.linuxppc.org
> > Subject: Re: Neighbour Table Overflow on NFS Server
> >
> >
> > I may be completely off-base here, but I seem to recall
> > getting some of
> > these a long time ago.  At the time I think it was cause by
> > a lack of a
> > loopback device and routes.
> >
> > -Mark
> >
> > On Thu, 28 Dec 2000, Cal Erickson wrote:
> >
> > >
> > > Navin,
> > >  The message "neighbour table overflow" is the result of
> > some
> > > changes to the IP stack software in Linux version 2.2.x +.
> > This
> > > simply means that you are unable to connect to your NFS
> > > server.  It may be related to the driver, but it may also
> > be
> > > related to other issues, such as NFS server not running or
> > > incorrectly installed, no physical connectivity to NFS
> > server,
> > > etc.  Check the configuration of your NFS server and IP
> > > network before diving into the driver.
> > >
> > > Cal Erickson
> > >
> > > Navin Boppuri wrote:
> > >
> > > > Hello,
> > > >
> > > > I have been debugging my custom 823 board. I have an NFS
> > Server setup on
> > > > which my kernel on the board mounts. I have using this
> > server without any
> > > > problems for more than a month. All of the sudden, my
> > NFS Server complains
> > > > of "Neighbour Table overflow" . The NFS Server was not
> > modified, nor
> > > > restarted. The error also says that the Server returned
> > error -5.  Can
> > > > someone suggest any remedy for this problem?
> > > >
> > > > Sincerely,
> > > > Navin Boppuri
> > > >
> > >
> > > --
> > >
> > ============================================================
> > ===============
> > > Cal Erickson                 MontaVista Software Inc.
> > > Linux Consultant             1237 E. Arques Ave.
> > > Phone (408) 328-0304         Sunnyvale CA 94085
> > > Fax   (408) 328-9204         web http://www.mvista.com
> > >
> > ============================================================
> > ===============
> > >
> > >
> > >
> >
> >
> > Mark S. Mathews
> >
> > AbsoluteValue Systems      Web:    http://www.linux-wlan.com
> > P.O. Box 941149            e-mail: mark@linux-wlan.com
> > Maitland, FL 32794-1149    Phone:  407.644.8582
> > USA                        Fax:    407.539.1294
> >
> >
> >
>
>
>


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: Neighbour Table Overflow on NFS Server

[clark]

Hello,

         Have you recompiled your kernel lately? You might have changed the
SCC number for your Ethernet interface by accident. I did this once and
went nuts trying to figure out what was wrong. Try changing it and see if
it works. If not change it back and continue to go nuts. ;-)

         Good Luck


At 02:54 PM 12/28/00 +0000, you wrote:

>Hello,
>
>I have been debugging my custom 823 board. I have an NFS Server setup on
>which my kernel on the board mounts. I have using this server without any
>problems for more than a month. All of the sudden, my NFS Server complains
>of "Neighbour Table overflow" . The NFS Server was not modified, nor
>restarted. The error also says that the Server returned error -5.  Can
>someone suggest any remedy for this problem?
>
>Sincerely,
>Navin Boppuri
>
>

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** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Neighbour Table Overflow on NFS Server

[Navin Boppuri]

Hello everyone,

Thank you very much for all your replies. From all the answers, I can
understand that there can be two main reasons,

   1) The connection to the server is messy due to either physical
connectivity issues or server issues
   2) Ethernet driver is messy.

Taking into account the first problem, I tried changing ethernet cables, hub
etc. but it did not help. The network is working just fine. We are able to
connect to the Internet, and to other machines in our network. Everything
else works fine. The funny thing is that I do a tftp of the zImage and that
part of it works just fine. It seems to be the NFS Server that fails. Now, I
did not change any settings in the NFS server from the last time it worked,
which was just a day back.

The strangest thing is that none of the NFS Server's I tried setting up on
my other linux machines seem to be working.

I am sure the ethernet driver is fine since the tftp works just fine. It's
been doing well from quite some time.

With all these factors, it has become very difficult to pinpoint to a
particular cause of failure. I am in the process of testing an important
driver till this popped up.

Thank you,
Navin Boppuri


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