random clients stall out at Error: Ioctl/1.1a failed: Bad file descriptor

[Tom Wolfe]

As a followup to my last plea for hyelp, I have done the following 
significant changes to a default install:

1) changed dhcpd.conf

tom at ed1:~$ cat /etc/ltsp/dhcpd.conf
#changed subnet to .100.0
authoritative;

subnet 192.168.100.0 netmask 255.255.255.0 {
     range 192.168.100.20 192.168.100.250;
     option domain-name "morleyschool.ed";
     option domain-name-servers 192.168.192.12;
     option broadcast-address 192.168.100.255;
     option routers 192.168.100.254;
#    next-server 192.168.100.1;
#    get-lease-hostnames true;
     option subnet-mask 255.255.255.0;
     option root-path "/opt/ltsp/i386";
     if substring( option vendor-class-identifier, 0, 9 ) = "PXEClient" {
         filename "/ltsp/i386/pxelinux.0";
     } else {
         filename "/ltsp/i386/nbi.img";
     }
}

2) changed the interfaces as follows:

tom at ed1:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
#primary interface - changed from dhcp
#to static as follows
#iface eth0 inet dhcp
iface eth0 inet static
     address 192.168.192.101
     netmask 255.255.252.0
     network 192.168.192.0
     broadcast 192.168.195.255

#secondary interface - changed subnet
#to .100.0
auto eth1
iface eth1 inet static
     address 192.168.100.254
     netmask 255.255.255.0
     network 192.168.100.0
     broadcast 192.168.100.255
       up iptables-restore < /etc/ltsp/nat.conf

3) followed the how-to for enabling NAT: 
https://wiki.ubuntu.com/ThinClientHowtoNAT
... and added a cron job to set the frigging ip_forward to 1 every minute 
because it seems to like being a 0 instead:
sudo sh -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'

4) followed the how-to for Active Directory:
https://help.ubuntu.com/community/ActiveDirectoryWinbindHowto
Note that I also checked out the Likewise Open way but I didn't like it 
and reverted to the more traditional approach described above.

5) installed ubuntu-restricted-extras for multimedia & internet browsing 
support (which, wow, works fantastic)

thanks in advance for any help with this folks.

Regards,
Tom Wolfe

---
      Tom Wolfe, Technology Coordinator 	twolfe at sawback.com
      Stoney Educational Authority	tel: (403) 881-2755
      Box 238, Morley AB, T0L 1N0	fax: (403) 881-2793
Morley Community School | Chief Jacob Bearspaw School | Ta-otha School


On Fri, 5 Dec 2008, Tom Wolfe wrote:

> Hi again,
>
> I'm now having problems with a few seemingly random clients that do not
> boot up but fail at the following:
>
> on tty8:
> * Starting basic networking
> * Starting kernel event manager
> * Loading hardware drivers
> * Loading kernel modules
> * Loading manual drivers
> * Setting up LTSP Client
> Disconnecting: que, disconnect, sock, done
> [	27.484772] nbd0: Receive control failed (result -32)
>
> on tty1:
> IP-Config: eth0 hardware address ... etc. etc.
>
> address: 192.168.100.31 broadcast: 192.168.100.255 netmask: 255.255.255.0
> gateway: 192.168.100.254 dns0: 192.168.192.12 dns1: 0.0.0.0
> domain: morleyschool.ed
> rootserver: 192.168.100.254 rootpath: /opt/ltsp/i386
> filename: /ltsp/i386/nbi.img
> Negotiation: ..size = 156428KB
> bs=1024, sz=156428
> Kernel call returned: Broken pipe Reconnecting
> Negotiation: ..size = 156428KB
> Error: Ioctl/1.1a failed: Bad file descriptor
>
> ----
> I get the tty1 error on all machines even ones that succeed in booting up
> (I'm using one of those right now in fact). But the ones that fail stop
> with the message above (tty8). There doesn't seem to be any rhyme or
> reason to which clients fail -- for example, a few Dell Optiplex GX115
> work, a few don't; a few IBM Netvista work, a few don't.
>
> Any advice?
>
> Regards,
> Tom Wolfe
>
> ---
>      Tom Wolfe, Technology Coordinator 	twolfe at sawback.com
>      Stoney Educational Authority	tel: (403) 881-2755
>      Box 238, Morley AB, T0L 1N0	fax: (403) 881-2793
> Morley Community School | Chief Jacob Bearspaw School | Ta-otha School
>
> -- 
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>