IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 18 July 2012   (all times are UTC)

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01:43
<laurei>
pnfs or dnbd for server failover running fat clients, has this been discussed?
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01:59
<laurei>
my idea is to run multiple ltsp servers that present a single read only dnbd/pnfs file system to the fat clients, so that not only is the load distributed but having a server fail will not be noticed by clients
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02:45
<dsugar100>
Anyone around for a quick question - I'm seeing an error after login on my client:
02:45
compiz[32400]: segfault at 800000038 ip 00007f56e354ef38 sp 00007fff8afc0f30 error 4 in libGL.so.1.2[7f56e3532000+5d000]
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04:24
<qwebirc18138>
Slam my name is M Mudasser Khan
04:24
i need some help regardining LTSP
04:24
i have ubuntu 10.04
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04:28
<qwebirc18138>
hello telex
04:29
hello is any body here
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04:41
<qwebirc18138>
hello any body here
04:41
plz tel me if any one here
04:41
oh hello oh hello oh hello ???????????????????????????????
04:41
looking some help about ltsp
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07:22
<laurei>
alkisg i got pretty deep into btrfs, sounds great
07:25
<alkisg>
laurei: cool, did you do anything fancy with it?
07:27
<laurei>
heh no just admired it :)
07:28
i wanted to run another crazy idea by you from 0143 in the log
07:29
<alkisg>
Server failover? What about the ssh connection?
07:36
<laurei>
i have a crude failover at the moment with two ltsp servers and have set up isc dhcp failovers, its working great, with ldap and nfs homes, if a server crashes then the client might have to reboot but at least will always get to reconnect to the second server
07:37
tested works great
07:37
ssh connection?
07:37
<alkisg>
LTSP uses it for authentication, but you say you're using LDAP, so nm there
07:38
Ah, unless you're only using LDAP for the server...
07:38
and not for the chroot
07:38
<laurei>
ldap is for everything
07:39
<alkisg>
So you're NOT using ldm?
07:39
<laurei>
im just thinking that the only thing that stands in the way of seamless failover is having the nbd image (or nfs) served by some kind of redundant file system, or is there something im missing?
07:39
I'm using fat clients so I'm assume ldm isnt needed here
07:40
<alkisg>
LTSP fat clients use ldm by default
07:40
Unless you're using some custom fat client implementation of your own
07:40
<laurei>
yeah its stock
07:40
<alkisg>
SSH then
07:40
Not LDAP
07:40
<laurei>
so ssh is standing in the way then?
07:41
<alkisg>
I'm not sure what happens when the ssh login connection dies on fat clients
07:41
<laurei>
so ssh is connecting to ldap via the server?
07:42
<alkisg>
Client ldm => uses ssh connection to the server to authenticate
07:42
Server => uses ldap to authenticate the user
07:42
Why don't you invest in some kind of VM teleporting?
07:42
<laurei>
that does make sense. so if i have ldap in the chroot then ssh isn't needed at all?
07:43
<alkisg>
You'd need another DM for LDAP in the chroot, as LDM doesn't support it
07:45
<laurei>
ahh ok supposing i have nfs_home enabled then ssh is really only for auth?
07:45
<alkisg>
Yes, and for ltsp_remoteapps etc
07:45
(for fat clients, while for thin everything goes through the ssh connection)
07:48
<laurei>
i think fat clients will be more popular in the future, would you agree / disagree?
07:50
<alkisg>
I think so too, but it's just a personal opinion, not a ...developer one :)
07:52
<laurei>
haha cool thin clients to me are like the equivelant of 8 track players
07:52
i do have my servers based in vms but not sure if teleporting is the way to go, ive seen them move really slowly, and haven't seen that used in a failover situation in any type of automated fashion
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09:46
<hace>
currently setting ltsp cluster with windows 2008 as application server
09:46
anyone know what license i need for client?
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11:15
<qwebirc84234>
slam
11:16
any one here and i m looking some ltsp
11:16
any one here
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11:30
<Hyperbyte>
Sure. What do you need help with qwebirc84234? #fail
11:32
<knipwim>
take it easy Hyperbyte :)
11:33* ogra_ likes if users are so patient, saves a lot of support work :)
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11:54
<Hyperbyte>
knipwim, oh, I'm taking it very easy. :)
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12:14
<[GuS]>
Hi guys!
12:15
i have a doub, can i specify a xorg file configuration for a workstation like used in ltsp4? (i am on Gentoo). Also, if the case, wheres the file has to be? (path)
12:17
<alkisg>
!lts.conf
12:17
<ltsp>
alkisg: lts.conf: http://manpages.ubuntu.com/lts.conf
12:17
<alkisg>
Read about X_CONF there
12:17
But in most cases it's *not* necessary, you can use X_* lts.conf options instead
12:18
<[GuS]>
alkisg: i know, but is to fix font corruption on a intel video card.
12:19
alkisg: i can add xorg options in ltsp?
12:19
ok, let me read the link
12:19
<alkisg>
Yup
12:19
What's the option you want to add?
12:19
<[GuS]>
alkisg: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/820881/comments/25
12:19
Those
12:20
<alkisg>
Sure, you can do that with X_OPTION* directives
12:20
<[GuS]>
Ahh great, thanks alkisg. I will try
12:20
<alkisg>
For i915.semaphores, you'd need pxelinux.cfg/01-mac-address
12:20
<[GuS]>
alkisg: yep, i know :)
12:20
Thanks
12:21
<alkisg>
"Heavy screen and font corruption when free memory is low on GMA950" ==> then it doesn't happen if you use NBD swap?
12:22
<[GuS]>
I do use it, and still happens
12:22
:(
12:22
Also using latest kernel, latest xorg-drivers...
12:23
is a Intel Corporation 82945G/GZ Integrated Graphics Controller, and i have 2 workstations with this same problem/card
12:24
<alkisg>
12.04?
12:25
<[GuS]>
alkisg: nope, LTSP
12:25
<alkisg>
Which distro?
12:25
<[GuS]>
Gentoo
12:25
<alkisg>
Sorry
12:25
Gentoo, ok
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12:30
<[GuS]>
alkisg: the slash in example X_OPTION_02 = "\"AnotherOption\" \"True\"" are necesary?
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12:31
<alkisg>
It works that way, not sure if they're necessary or not
12:31
<[GuS]>
ok
12:35
alkisg: great, that works. No more font corruption :)
12:52
<alkisg>
Cool
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15:08
<knipwim>
[GuS]: you can do a ltsp-chroot --arch=i686 --mount-all to mount the portage dirs
15:08
or create a /etc/ltsp/ltsp-chroot.conf on the server with the following vars
15:08
ARCH=i686
15:08
MOUNT_ALL=true
15:09
and then ltsp-chroot will always mount everything for /opt/ltsp/i686
15:09
<[GuS]>
knipwim: ok, thaks
15:09
<knipwim>
also it automatically unmount everything when you exit the chroot
15:09
<[GuS]>
thanks*
15:10
nice
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15:25
<knipwim>
[GuS]: just out of curiosity, which ltsp-server and kicktoo are you using?
15:26
<[GuS]>
ltsp 5.3.7 kicktoo 0.4.2
15:27
<knipwim>
the 5.4 at least deals with that /etc/ltsp_chroot problem
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16:06
<[GuS]>
knipwim: nice. I will test in my vbox Gentoo test VM
16:08
<knipwim>
[GuS]: and do you make a 5.3 client yet?
16:08
<[GuS]>
knipwim: nope, 5.2
16:08
knipwim: i had problems with 5.3 too. I dont remember which one..
16:08
<knipwim>
okay, i won't remove that one yet
16:08
<[GuS]>
With 5.2, the problem was about /etc/ltsp_chroot
16:09
ok
16:09
and the X that didnt boot was cause a broken lib, which solved with revdep-rebuild
16:09
<knipwim>
if you have details on the 5.3, send them to me
16:09
<[GuS]>
Ok
16:10* alkisg hasn't used PRINTER_0_DEVICE yet... but wouldn't it be much easier to have it autodetected/automatically exported, e.g. LTSP_PUBLISH_PRINTERS=True (=the default) instead?
16:11
<knipwim>
[GuS]: i can't fix any gentoo ltsp problems if i don't know
16:11
<[GuS]>
knipwim: i know :)
16:11
<alkisg>
Maybe even with an udev rule that matches all printers...
16:12
<[GuS]>
Just figured out after fix the /etc/ltsp_chroot
16:12
<knipwim>
:)
16:12
<alkisg>
So that hotplugging is supported as well
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16:12
<[GuS]>
Cuase otherwise, i wouldnt know...
16:12
<knipwim>
alkisg: i trust your judgement :)
16:12
not using printers anyway
16:13
<alkisg>
knipwim: till now, I was using CUPS, I've never used jetpipe, so I'm not experienced enough to judge that, but I do think it sounds saner...
16:13* [GuS] in my work, we use many printers in our clients, which use LTSP
16:13
<alkisg>
stgraber: ? ^
16:15
ogra_: ? ^
16:15
<ogra_>
i dont know how the code changed during the rewrite
16:16* ogra_ hasnt touched jetpipe since he created it :P
16:16
<alkisg>
ogra_: but does it sound sane to use udev to publish any connected printers with jetpipe by default?
16:16
<ogra_>
i know that usblp0 always wroked ootb thogh
16:16
as long as we are sure we're a thin client, why not
16:16
<alkisg>
Cool
16:17
<ogra_>
i wouldnt do that on a fat client or normal desktop
16:17
<alkisg>
Why not on a fat client?
16:17
<ogra_>
well, probably even on a fat client but make it configurable easily
16:17
i see fat clients more like normal desktops
16:18
while thin clients are just kbd/mouse/monitor extenders for the server
16:18
<alkisg>
I'm using CUPS printer sharing with fat clients, but it does require a couple of extra steps, while jetpipe doesn't,
16:18
<ogra_>
right
16:18
<alkisg>
...do you think there would be any drawbacks (e.g. some printers not working) if they used jetpipe too?
16:18
We could easily disable cupsd on fat clients by default...
16:18
<ogra_>
well, feel free to do as you like, i just wouldnt like it on by default on normal desktops :)
16:19
<alkisg>
Of course :)
16:19
Ty for the feedback :)
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16:22
<stgraber>
alkisg: moving jetpipe to a udev hook sounds good (as long as there's a parameter that you need to set for that to happen)
16:24
<alkisg>
stgraber: why not LTSP_PUBLISH_PRINTERS=*True* by default?
16:24
Isn't it more common to want the printers published to the ltsp server, than not?
16:26
<stgraber>
I don't like the idea of someone being able to scan port 9100 of a badly configured network and trigger prints on all the printers of the network
16:26
there are also quite a few viruses for printers (modifying firmware so that they are indefinitely broken or even overheat in some cases) that I wouldn't like to work out of the box
16:29
<alkisg>
stgraber: what if we were using iptables to only allow access from the server?
16:30
<stgraber>
alkisg: that'd be reasonable. Would need quite some tricks to work with ltsp-cluster and people overriding LDM_SERVER, but yeah, I think I'd be fine with that
16:33
<alkisg>
Cool, I think we could add all LDM_SERVERs on boot time, and upon login
16:33
I'll have a look into this
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17:48
<[GuS]>
knipwim: btw, what could be this error? http://img861.imageshack.us/img861/2218/ltsp1.png it appears when booting
17:49
knipwim: also i think cause of that the lts.conf is not being copied, so i have to put it under the chroot to work.
18:00
<knipwim>
[GuS]: good one, i just noticed it too
18:01
i planned to look at it later though
18:02
i noticed i have it in my current install also, but the client is booting
18:03
<[GuS]>
knipwim: ok
18:03
I dont know then why the lts.conf does not get copied. i've applied what the wiki says, about using curl.
18:04
And i've installed curl in the chroot
18:04
<knipwim>
and it still doesn't work?
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18:40
<thebwt>
So I'm doing a awkward ltsp configuration, and trying to figure out where things are breaking down. We need to use 'ipxe' to manually specify a path to the pxelinux.0 file (can't use dhcp). So this part works, the kernel is loaded over apache, but after that it tries to grab pxelinux.cfg profiles over tftp, which seems to fail. Is the tftp data somehow tied to the assumed dhcp address (which we don't use)?
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18:41
<thebwt>
I can manually tftp into the server, but I feel like the pxelinux binary has the wrong tftp info, and I'm not sure where to change that
18:42
<alkisg>
thebwt: do you need to use pxelinux? Just point ipxe to the kernel directly...
18:42
<muppis>
You specify static IP?
18:42
<thebwt>
muppis: nope, it's dhcp. But it has a hostname
18:42
alkisg: the kernel directly doesn't seem to work in the past.. let me try again
18:42
alkisg: thats vmlinuz right?
18:43
<alkisg>
thebwt: it does work, if you need the ipxe command line for that I can look it up for you...
18:43
vmlinuz/initrd.img
18:43
<thebwt>
that would be awesome!
18:43
going to try initrd and kernel directly with those
18:45
<alkisg>
dhcp net0
18:45
# Put the LTSP server IP in the following line
18:45
set next-server 10.160.31.10
18:45
kernel tftp://${next-server}/ltsp/i386/vmlinuz ro initrd=initrd.img nbdroot=${next-server}:2000 nbd_proxy=false
18:45
initrd tftp://${next-server}/ltsp/i386/initrd.img
18:45
boot vmlinuz
18:45
That's for tftp, change it to http
18:45
Also put the correct command line there
18:46
And you can put the ip info too, moment...
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18:46
<thebwt>
wow, thanks!
18:46
<alkisg>
thebwt: google translate that: http://alkisg.mysch.gr/steki/index.php?topic=1451.msg30596#msg30596
18:46
Recent ipxe versions support scripts as grub initrds
18:47
So you can put the script in a text file, if you didn't know that
18:47
<thebwt>
I saw stuff about that, needed to getting ti working manually before I started to play with that
18:48
but actaully.. it may be easier to troubleshoot if I jsut write a script
18:48
thanks so much, this has been killing me for that last day
18:48
<alkisg>
You're welcome
18:48
thebwt: btw, depending on your configuration, you might even not need ipxe
18:49
So if you want, you can describe your use case with more details...
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18:49
<alkisg>
There are things like e.g. proxydhcp that help a lot there
18:50
tftp is also used to fetch lts.conf, so it's preferred to http
18:50
<thebwt>
I work at a university, dhcp is out of our department. So getting things liekt his into our network is a bunch of red tape.
18:51
So I'm trying to compensate by not needing dhcp info
18:51
that's all
18:51
<alkisg>
!proxydhcp | echo thebwt:
18:51
<ltsp>
thebwt: I do not know about 'proxydhcp', but I do know about these similar topics: 'proxy-dhcp'
18:51
<alkisg>
!proxy-dhcp | echo thebwt:
18:51
<ltsp>
thebwt: proxy-dhcp: https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP
18:52
<alkisg>
So you can (re)use the university dhcp without touching it
18:52
That's much saner than the ipxe way, and it works with NIC boot roms too
18:52
<thebwt>
would this dhcp proxy have to act as a gateway for labs though?
18:53
<alkisg>
No
18:53
It's just a local helper that tells the clients about "next-server" and "boot-filename"
18:53
<thebwt>
neat...
18:53
thanks a ton
18:53
<alkisg>
And you can limit the clients it answers to from dnsmasq.conf
18:54
!forget proxy-dhcp
18:54
<ltsp>
alkisg: The operation succeeded.
18:55
<alkisg>
!learn proxydhcp as A proxy DHCP server is defined by the PXE specification as a server which sends auxiliary boot information to clients, like the boot filename, tftp server or rootpath, but leaves the task of IP leasing to the normal DHCP server. More info: https://help.ubuntu.com/community/UbuntuLTSP/ProxyDHCP
18:55
<ltsp>
alkisg: The operation succeeded.
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18:58
<Hyperbyte>
!nbdswap
18:58
<ltsp>
Hyperbyte: Error: "nbdswap" is not a valid command.
18:58
<alkisg>
Ouch some people edited that wiki page and put invalid info in it :(
18:58
<Hyperbyte>
alkisg, time to put it on the real LTSP wiki. ;-)
18:59
<alkisg>
Hyperbyte: afaik we're not putting distro-specific information to the LTSP wiki, do we?
18:59
<Hyperbyte>
Not entirely sure. I don't see why we wouldn't though.
18:59
We could have a general page explaining what ProxyDHCP is at least, with some pointers to which software to use and how to configure it
18:59
<alkisg>
Alex said that we want to leave the distro documentation to each distro site...
19:00
Well, then the pointer would still be that ubuntultsp wiki page, which now is invalid
19:00
<Hyperbyte>
Question - with fat clients, don't I -need- nbdswap?
19:01
<alkisg>
Hyperbyte: err, fats are not different than thins wrt swap
19:01
If you have enough RAM for your needs, you don't need swap, else you do
19:01
I always put 512MB nbd swap to both thin and fat clients
19:02
I think the most recent ltsp default is to enable NBD_SWAP automatically for clients with little RAM, little==different depending on if they're thin or fat
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19:22
<thebwt>
so during boot up, I'm getting "IP-Config: no response after `n` seconds, giving up" I think this si while it's trying to get nbd going
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19:28
<thebwt>
hmm seems to be general dhcp issues
19:28
woot
19:29
<[GuS]>
[15:04] <knipwim> and it still doesn't work? ---> No :(
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19:35
<[GuS]>
knipwim: I have a question. I use xdmcp instead of ldm, since here in my work, most of the thin clients login in other server instead of the one that has ltsp installed, case does not work if i use LDM.
19:35
even when in that other server, i have installed ldminfo
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19:43
<thebwt>
alkisg: nbd seem to think that the line "nbdroot=${next-server}:2000 nbd_proxy=false" is "insuficient information" when I alt-f7 to look at the log, the name is set to 2000, the port and device are left blank
19:43
<alkisg>
thebwt: use the command line from your /var/lib/tftpboot/ltsp/i386/pxeinux.cfg/default
19:43
That nbdroot=... was the old command line, for 10.04
19:44
<thebwt>
roger
19:56
<[GuS]>
Well, time to go home. Thanks all! cheers.
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20:28
<jamyl>
hello peoples :)
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21:06
<Hyperbyte>
jamyl, hi!
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21:08
<dhanasekaran>
Hi Guys I am unable download kernel from tftpd-hpa server
21:08
please guys help
21:09
<alkisg>
!tftp
21:09
<ltsp>
alkisg: tftp: Here's a page to help you troubleshoot TFTP problems in Ubuntu: https://help.ubuntu.com/community/UbuntuLTSP/Troubleshooting/TFTP
21:09
<dhanasekaran>
I tried 'mode binary' then 'get /i386/pxelinux.0' Not working
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21:10
<dhanasekaran>
alkisg, I write TFTP_DIRECTORY="/opt/ltsp" in /etc/default/tftpd-hpa
21:10
<alkisg>
Why?
21:10
Put your /etc/default/tftpd-hpa as it was
21:11
<dhanasekaran>
But unable to download the kernel from server
21:12
alkisg, this my config file http://pastebin.com/L9N7enzN
21:13
alkisg, I put all files in /opt/ltsp location'
21:13
<alkisg>
dhanasekaran: why?
21:13
<dhanasekaran>
I try to download file to local machine show root ~ # tftp 192.168.70.25
21:13
tftp> mode binary
21:13
tftp> get netboor.tar
21:13
Transfer timed out.
21:14
<alkisg>
Then you'd need to notify LTSP that your kernels are NOT in /var/lib/tftpboot/ltsp/i386 as they're supposed to be
21:14
dhanasekaran: please don't write what you're trying; try what I'm writing
21:14
Put back the defaults, don't mess up your configuration
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21:15
<dhanasekaran>
alkisg, netboot.tar in /opt/ltsp location
21:15
I try to download connection timed out error
21:16
<alkisg>
Which distro/version are you using?
21:16
<dhanasekaran>
ubuntu 12.04 64-bit
21:17
alkisg, tftp-hpa 5.2
21:18
alkisg, any configuration mistake i done it?
21:18
<alkisg>
dhanasekaran: yes
21:19
You shouldn't modify your /etc/default/tftpd-hpa, put it back as it was
21:19
<dhanasekaran>
alkisg, please guide me.. I am new guys try ltsp
21:19
<alkisg>
Also, don't use .tar files, they cannot be used for booting
21:19
I did guide you
21:19
I told you 4 times to restore your /etc/default/tftpd-hpa as it was
21:19
<dhanasekaran>
alkisg, thanks , I did it restored
21:20
<alkisg>
OK, now restart the tftpd-hpa service
21:20* alkisg heads off to bed, someone might continue with any other problems that you may still have...
21:20
<dhanasekaran>
tftpd-hpa stop/waiting
21:20
tftpd-hpa start/running
21:20
ok done it
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21:30
<dhanasekaran>
Guys Any one help me Transfer timed out. Tftpd-hpa
21:30
Guys Any one help me Transfer timed out. Tftpd-hpa
21:30
Guys Any one help me Transfer timed out. Tftpd-hpa
21:31
<||cw>
anything in the server logs?
21:34
<dhanasekaran>
||cw, I am new guys to ltsp.. please guide me How to resolve this issue.
21:35
<||cw>
if you tftp is timing out, it's not an ltsp issue, it's a server/tftp/client/networking issue
21:35
can you get any file at all from tftp?
21:35
<dhanasekaran>
no
21:36
but in my client ping ing server working
21:36
server reachable in client end
21:36
<||cw>
that doens't mean you don't have a network issue
21:37
<dhanasekaran>
||cw, yes
21:37
<||cw>
you need an error from the server side too, syslog? debug mode?
21:37
I've never needed to debug tftp before
21:37
<dhanasekaran>
how to go debug mode
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21:39
<dhanasekaran>
||cw, I am using ubutnu 12.04 64-bit
21:41
<||cw>
man tftpd-hpa ?
21:41
<dhanasekaran>
||cw, I read But Not working I tried 'mode binary' then 'get /i386/pxelinux.0'
21:43
<||cw>
it's standard linux trouble shooting stuffs. I dont' really have time to train you. sorry.
21:43
<dhanasekaran>
||cw, thanks ...
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