Junos OS

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DHCP helper and PXE Boot configuration

  • 1.  DHCP helper and PXE Boot configuration

    Posted 10-16-2018 06:17

    Hi Everyone,
    I am currently trying to setup a pxe boot. So far I have setup when we pxeboot our dell server it does successfully grab an IP address, but then failed with error "PXE-E11: ARP timeout"

     

    My dhcp helper configuration look as this:
    {master:0}[edit routing-instances users forwarding-options]
    lpaulin@4dc-core-01# show | display inheritance no-comments
    dhcp-relay {
    overrides {
    always-write-giaddr;
    }
    server-group {
    KRK-COBBLER {
    10.X.51.10;
    }
    }
    group PXEBOOT {
    active-server-group KRK-COBBLER;
    overrides {
    delete-binding-on-renegotiation;
    }
    relay-option {
    option-number 60;
    equals {
    ascii PXEClient {
    forward-only;
    }
    }
    }
    interface irb.2051;
    }
    }

     

    I have also try to enable to tftp helpper but does not seem to work either...
    lpaulin@4dc-core-01# show | display inheritance no-comments
    helpers {
    tftp {
    server 10.X.51.10;
    interface {
    irb.2051;
    }
    }
    }

     

    Am I missing something in the configuration? My switches are 2 QFX10K in Junos Fusion Datacenter topology.



  • 2.  RE: DHCP helper and PXE Boot configuration

    Posted 10-16-2018 12:13

    Do you need the options?
    I have working PXE with the following, does DHCP and PXE, only goes to the PXE server for PXE stuff.

     

    dhcp-relay {
    overrides {
    delete-binding-on-renegotiation;
    }
    server-group {
    DHCP-WITH-PXE {
    10.x.x.22; ---DHCP Server
    10.x.x.23; ---DHCP Server
    10.x.x.41;----PXE Server
    10.x.x.21; ----PXE Server
    }
    }
    group DHCP-CLIENT-PXE {
    active-server-group DHCP-WITH-PXE;
    interface irb.1001;
    interface irb.1111;
    interface irb.2661;
    }
    }



  • 3.  RE: DHCP helper and PXE Boot configuration

    Posted 10-17-2018 06:08

    Thanx @agarrison, 

    Already try a configuration similar like your and got the same result.  

     

    What I acutually found lately is that if I run continuous ping to the IP the server grab, once pxe say it acquire the IP the router can't ping it at al, even though that I can see it's mac address within the switching table. Also if boot the server within the OS, I can ping the host successfully. So this lead me to thing that either there's a issue with the pxe client or the switches does let pass pxe/tftp traffic properly.  

     

    Any thoughs about this ?  I am about to open a case with Juniper, though that I not convice if it's an issue with switches configuration or something else.