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DHCP Option (66) Not working

Allan Pumphrey

Hi, I'm trying to config PXE booting but DHCP Option (66) is missing when I inspect the boot sequence via TCPDump. I have had a look thru the forums but have not found a solution. Has anyone been able to get PXE boot working on a XG appliance?

 

 

UPDATE: I spoke to Sophos support and they suggest a Business Application DNAT rule to forward traffic that comes to the XG's LAN IP on port UDP 69 (TFTP) to the "TFTP Server" which did the trick!

 



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    I am also having issues with this.  The DNAT trick didn't work for me.

    Looking on the XG @ /cfs/system/dhcp/dhcpd.conf you can see the options set, but not sure they are the correct ones.  For ISC DHCP the value of "next-server" and "filename" are required for some device types.  Those values are not set in the configuration file and is likely causing the issue.  I tested with ISC DHCP on a Linux server and it worked correctly with configuration below.

    # XG - /cfs/system/dhcp/dhcpd.conf (Not Working)

    option tftp-server-name "10.10.10.10";
    option bootfile-name "pxelinux.0";

    # Linux Server - /etc/dhcpd.conf (Working)

    next-server 10.10.10.10; #  DHCP server ip
    filename "pxelinux.0";

    For now the XG is not usable as a DHCP server for our environment, which is quite disappointing.

  • 0 in reply to Bracey Summers

    We ended up using the XG DHCP for assigning an IP Addresses only. Then we used Matchbox (Coreos/Kubernetes) to manage our PXE / iPXE requirements (via the Kubernetes Master Node(s)) which works really well for us. But agreed, it was disappointing that XG DHCP does not work as expected.

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