[Dnsmasq-discuss] PXE question

Tue Jan 22 18:51:21 GMT 2013

On Tue, Jan 22, 2013 at 07:41:02PM +0100, sam at sltosis.org wrote:
> 
> 
> Hello,
> 
> I recently bought a laptop with UEFI, this has been somewhat painfull until
> now, so I may be doing something wrong!
> 
> 
> Anyway, there seems to have two PXE modes on this laptop, the legacy one and
> the one with UEFI.  In some of my desperates attempts to boot the thing
> via(on?) UEFI, I've setup dnsmasq to act as a PXE server(followed the
> documentation on edubuntu.org[1]):
> 
> 
> parts of dnsmasq.conf:
> dhcp-range=eth1,10.10.10.10,10.10.10.15,255.255.255.0
> enable-tftp=eth1
> tftp-secure
> tftp-root=/var/tftp
> dhcp-vendorclass=set:dopxe,PXEClient
> dhcp-boot=tag:dopxe,bootx64-ubumini.efi
> 
> (by the way: dnsmaqsq is running as the user 'dnsmasq', but it will serve files
> it doesn't own despite the 'tftp-secure' directive - dnsmasq 2.62 on a debian
> testing box-)
> 
> Now what's weird is that when I boot through the "UEFI: IPv4 Realtek Ethernet
> Controller" menu item, I can see this in dnsmasq log:
> 
> 
> Jan 22 17:51:57 dellwork dnsmasq-dhcp[30855]: 1296261650 available DHCP range: 10.10.10.10 -- 10.10.10.15
> Jan 22 17:51:57 dellwork dnsmasq-dhcp[30855]: 1296261650 vendor class: PXEClient:Arch:00007:UNDI:003016
> Jan 22 17:51:57 dellwork dnsmasq-dhcp[30855]: 1296261650 DHCPDISCOVER(eth1) 50:46:5d:4a:a3:70
> Jan 22 17:51:57 dellwork dnsmasq-dhcp[30855]: 1296261650 tags: dopxe, eth1
> Jan 22 17:51:57 dellwork dnsmasq-dhcp[30855]: 1296261650 DHCPOFFER(eth1) 10.10.10.12 50:46:5d:4a:a3:70
> ...
> Jan 22 17:52:01 dellwork dnsmasq-dhcp[30855]: 1296261650 sent size:  4 option:  3 router  10.10.10.1
> Jan 22 17:52:01 dellwork dnsmasq-dhcp[30855]: 1296261650 sent size:  4 option:  6 dns-server  10.10.10.1
> Jan 22 17:52:01 dellwork dnsmasq-tftp[30855]: error 8 User aborted the transfer received from 10.10.10.12
> Jan 22 17:52:01 dellwork dnsmasq-tftp[30855]: failed sending /var/tftp/bootx64-ubumini.efi to 10.10.10.12
> Jan 22 17:52:09 dellwork dnsmasq-tftp[30855]: sent /var/tftp/bootx64-ubumini.efi to 10.10.10.12
> Jan 22 17:53:12 dellwork dnsmasq-tftp[30855]: sent /var/tftp/bootx64-ubumini.efi to 10.10.10.12
> 
> 
> Notice how the transfer is apparently aborted but continues anyway. this leads
> me to a new grub error (it's not the grub installed on the local disk) but it
> probably also means the transfer went correctly.
> 

I forgot to mention it does also happen in the 'legacy' PXE mode:

dnsmasq-tftp[6102]: error 0 TFTP Aborted received from 10.10.10.12
dnsmasq-tftp[6102]: failed sending /var/tftp/pxelinux.0 to 10.10.10.12
dnsmasq-tftp[6102]: sent /var/tftp/pxelinux.0 to 10.10.10.12
dnsmasq-tftp[6102]: file /var/tftp/pxelinux.cfg/51544358-4a31-4a30-4532
dnsmasq-tftp[6102]: file /var/tftp/pxelinux.cfg/01-50-46-5d-4a-a3-70 no
dnsmasq-tftp[6102]: file /var/tftp/pxelinux.cfg/0A0A0A0C not found
...
dnsmasq-tftp[6102]: file /var/tftp/pxelinux.cfg/0 not found
dnsmasq-tftp[6102]: sent /var/tftp/pxelinux.cfg/default to 10.10.10.12
dnsmasq-tftp[6102]: sent /var/tftp/debian-installer/amd64/boot-screens/
...
dnsmasq-tftp[6102]: sent /var/tftp/pxelinux.cfg/default to 10.10.10.12

Again, it works correctly despite the error.

> I've tested this with atftpd instead of dnsmasq for the tftp server and atftpd
> did not yield anything about the transfer being aborted. Although atftpd may
> just be less verbose about it, I end up with the same grub error
> message(meaning I'm still struggling to get this UEFI thing  working but I
> don't think that's related)
> 
> 
> Here is the output from atftpd just in case:
> 
> 
> 
> $ sudo atftpd -v --logfile - --no-fork --user dnsmasq --daemon --bind-address 10.10.10.1 /var/tftp/
> atftpd[5033.-1507137792]: Advanced Trivial FTP server started (0.7)
> atftpd[5033.-1507137792]:   running in daemon mode on port 69
> atftpd[5033.-1507137792]:   bound to IP address 10.10.10.1 only
> atftpd[5033.-1507137792]:   logging level: 6
> atftpd[5033.-1507137792]:   directory: /var/tftp//
> atftpd[5033.-1507137792]:   user: dnsmasq.nogroup
> atftpd[5033.-1507137792]:   log file: -
> atftpd[5033.-1507137792]:   not forcing to listen on local interfaces.
> atftpd[5033.-1507137792]:   server timeout: Not used
> atftpd[5033.-1507137792]:   tftp retry timeout: 5
> atftpd[5033.-1507137792]:   maximum number of thread: 100
> atftpd[5033.-1507137792]:   option timeout:   enabled
> atftpd[5033.-1507137792]:   option tzise:     enabled
> atftpd[5033.-1507137792]:   option blksize:   enabled
> atftpd[5033.-1507137792]:   option multicast: enabled
> atftpd[5033.-1507137792]:      address range: 239.255.0.0-255
> atftpd[5033.-1507137792]:      port range:    1758
> atftpd[5033.-1528297728]: socket may listen on any address, including broadcast
> atftpd[5033.-1528297728]: Serving bootx64-ubumini.efi to 10.10.10.12:1957
> atftpd[5033.-1528297728]: tsize option -> 36801024
> atftpd[5033.-1528297728]: blksize option -> 1468
> atftpd[5033.-1528297728]: Server thread exiting
> atftpd[5033.-1528297728]: socket may listen on any address, including broadcast
> atftpd[5033.-1528297728]: Serving bootx64-ubumini.efi to 10.10.10.12:1958
> atftpd[5033.-1528297728]: blksize option -> 1468
> atftpd[5033.-1528297728]: Server thread exiting
> 
> 
> 
> Obvious question then: why dnsmasq thinks the transfer was aborted?
> 
> 
> If you need more info, just tell me and Ill do my best!
> 
> 
> Thanks!
> 
> 
> 
> [1] -> https://wiki.edubuntu.org/UEFI/PXE-netboot-install
> 
> 
> PS: laptop is an asus x401a, anyone got it working with linux&UEFI ready to
> share some information with me offlist? :)
> 
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