[ipxe-devel] BOOTP_FL_BROADCAST 0x8000 trouble

[Juergen Brunk]

Hi Dev-Team

I'm working on a iPXE solution and unfortunately I've run into trouble with the DHCP part. I've checked the forum and found a unanswered question: 
" So how can I ensure that iPXE uses #define BOOTP_FL_BROADCAST 0x8000 when doing DHCP?" 
This discribe my problem exactly.

See the tcpdump here:
***********************************************************************************************************************
Test with standard PXE:
=======================

[root@ ~]# tcpdump -lenx -s 1500 port bootps or port bootpc | dhcpdump
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 1500 bytes
TCPdump 3.8.x output
  TIME: 09:27:32.866541
    IP: > (00:0c:29:fb:2c:f5) >  (Broadcast)
    OP: 1 (BOOTPREQUEST)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: 2afb2cf5
  SECS: 4
 FLAGS: 7f80				<<<=== !

Test with iPXE:
===============

listening on eth0, link-type EN10MB (Ethernet), capture size 1500 bytes
TCPdump 3.8.x output
  TIME: 09:29:49.850330
    IP: > (00:0c:29:fb:2c:f5) >  (Broadcast)
    OP: 1 (BOOTPREQUEST)
 HTYPE: 1 (Ethernet)
  HLEN: 6
  HOPS: 0
   XID: d63ee953
  SECS: 4
 FLAGS: 0				<<<=== !
***********************************************************************************************************************
I'm using the newest release of iPXE and working in a VMWare environment. Here is my included ipxe-script:

#!ipxe

echo
echo +----- RCH adjusted area -----+
echo
dhcp net0 || echo DHCP error

set timeout 5000

:start
menu iPXE boot menu

item --gap -- ------------------------- select desired task ------------------------------
item --default --key x exit     Exit iPXE and continue BIOS boot
item           --key i install  Install/reinstall OS
item           --key r rescue   Boot a rescue system
item --gap -- ------------------------- Advanced options -------------------------------
item --key c config Configure settings
item shell Drop to iPXE shell
item reboot Reboot computer
item
choose --timeout ${timeout} selected || goto cancel
set timeout 0
goto ${selected}

:cancel
echo You cancelled the menu, dropping you to a shell

:shell
echo Type exit to get the back to the menu
shell
set timeout 0
goto start

:reboot
reboot

:exit
exit

:config
config
goto start

:install
echo
echo Please type the hostname
read hn
set hostname ${hn}
chain tftp:// xxx.xxx.xxx.xxx /pxelinux.cfg/${hn} || goto menu_ip

:rescue
chain tftp:// xxx.xxx.xxx.xxx /pxelinux.cfg/rescue || shell

:menu_ip
echo
echo Please type the IP adresss
read ip
set net0/ip ${ip}
chain tftp://xxx.xxx.xxx.xxx/pxelinux.0 || shell
***********************************************************************************************************************

Without this flag our firewall block such traffic - and unfurtunately it's not option to change something in the firewall.
I'm not a C-Guru and tried to find the problem insite the src c-files but without success. Could you give me an advice how to ensure that the "FLAGS 7f80" is also set with iPXE?



Kind Regards
Jürgen Brunk