vm+ipxe+pxeboot fail

[amine tay]

Thanks Doug for you reply,

Your answer helped a lot, I will try your patch and let you know if it
works.

Amine.


2014-05-06 17:40 GMT+02:00 Doug Ambrisko <ambrisko at ambrisko.com>:

> On Wed, Apr 30, 2014 at 10:10:07AM +0200, amine tay wrote:
> | Hi everyone,
> |
> | Lately I had some problems, trying to get FreeBSD to PXE boot. (Actually
> | I'm using a VMware virtual machine.) First I'm using iPXE 1.0.0 and then
> | load and launch the FreeBSD pxeboot
> | <http://man.freebsd.org/pxeboot>loader. But I'm getting this :
> | http://forums.freebsd.org/viewtopic.php?f=4&t=45901
> | When using isc-dhcp as DHCP server I'm getting the error but when using
> | dnsmasq everything works fine.
> |
> | The problem seems that the client when booting is sending 2 DHCP requests
> | and therefore gets two different IP addresses, the first one sent by the
> | ROM and the second one by the FreeBSD
> | pxeboot<http://man.freebsd.org/pxeboot>loader.
> |
> | I found somewhere in some posts that the pxe.c file is doing a second
> | bootprequest because it fails to get cached DHCP data from the ROM.
> |
> | Any help or more ideas would be appreciated.
>
> If you do a dump on the packets you can probably see the iPXE is sending
> a client ID and the pxeboot isn't.  So then ISC DHCP server doesn't like
> that and gives a different IP.  Then things don't match up anymore.
>
> This is a patch to fix libstand for iPXE but then seems to break HW PXE.
> However, I'm finding with some new eval. HW, PXE is starting to fail on
> something else.
>
> Index: bootp.c
> ===================================================================
> --- bootp.c     (revision 255868)
> +++ bootp.c     (working copy)
> @@ -146,8 +146,12 @@
>         if (flag & BOOTP_PXE) {
>                 bp->bp_vend[7] = TAG_CLASSID;
>                 bp->bp_vend[8] = 9;
> -               bcopy("PXEClient", &bp->bp_vend[9], 9);
> -               bp->bp_vend[18] = TAG_END;
> +               bcopy(bp->bp_chaddr, &bp->bp_vend[9], 9);
> +               bp->bp_vend[18] = TAG_CLIENTID;
> +               bp->bp_vend[19] = 7;    /* type and length */
> +               bp->bp_vend[20] = 1;    /* MAC */
> +               bcopy(d->myea, &bp->bp_vend[21], 6);
> +               bp->bp_vend[27] = TAG_END;
>         } else
>                 bp->bp_vend[7] = TAG_END;
>  #else
> @@ -190,7 +194,11 @@
>                         bp->bp_vend[25] = TAG_CLASSID;
>                         bp->bp_vend[26] = 9;
>                         bcopy("PXEClient", &bp->bp_vend[27], 9);
> -                       bp->bp_vend[36] = TAG_END;
> +                       bp->bp_vend[36] = TAG_CLIENTID;
> +                       bp->bp_vend[37] = 7;    /* type and length */
> +                       bp->bp_vend[38] = 1;    /* MAC */
> +                       bcopy(d->myea, &bp->bp_vend[39], 6);
> +                       bp->bp_vend[45] = TAG_END;
>                 } else
>                         bp->bp_vend[25] = TAG_END;
>
>
> You'll need to rebuild libstand.a, rebuild pxeboot with the new libstand.a.
> I haven't figure out how to determine if it needs it or not.  I ran into
> this when trying to PXE boot in VirtualBox and QEMU.  There might be
> an option in dhcpd.conf to disable this check for client ID.
>
> Thanks,
>
> Doug A.
>