CentOS - Feb 2019 - Network switch to IPV6 after PXE boot

I'm trying to autoinstall a DELL 9030 desktop with CentOS7 using PXE and
Kikstart. I fall in a strange problem (I have several other laptop or
desktop using this install process without any problem, kernel and
initrd are from a Centos 7.4 iso)

- PXE boot start and the desktop load the kernel and the inirtd file

- the kernel is booted and at this time the led of the network switch
goes down for the port used by the desktop.

- then I have a message "no carrier detected on interface em1"

- followed by " IPv6 ADDRCONF(NETDEV_CHANGED): em1: link become ready
(and of course the led goes back to green on the switch)

But I have no IPV6 network setup!

How can I force to IPV4 setup to load the kikstart file ?

I've tried do switch from legacy boot to UEFI boot (my local server
setup can answer requests for the two options), update the BIOS of the
desktop...


Any help is welcome


Patrick

On Mon, Feb 18, 2019 at 06:36:10PM +0100, Patrick B?gou wrote:
...
> 
> - PXE boot start and the desktop load the kernel and the inirtd file
> 
> - the kernel is booted and at this time the led of the network switch
> goes down for the port used by the desktop.
> 
> - then I have a message "no carrier detected on interface em1"
> 
> - followed by " IPv6 ADDRCONF(NETDEV_CHANGED): em1: link become ready
> (and of course the led goes back to green on the switch)
just add "nicdelay=50 linksleep=50" to your kickstart script
(adapt the 50 secondes to your needs)

Cheers

Tru

-- 
Tru Huynh 
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBEFA581B
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Le 18/02/2019 ? 18:58, Tru Huynh a ?crit?:
> On Mon, Feb 18, 2019 at 06:36:10PM +0100, Patrick B?gou wrote:
> ...
>> - PXE boot start and the desktop load the kernel and the inirtd file
>>
>> - the kernel is booted and at this time the led of the network switch
>> goes down for the port used by the desktop.
>>
>> - then I have a message "no carrier detected on interface
em1"
>>
>> - followed by " IPv6 ADDRCONF(NETDEV_CHANGED): em1: link become
ready
>> (and of course the led goes back to green on the switch)
> just add "nicdelay=50 linksleep=50" to your kickstart script
> (adapt the 50 secondes to your needs)
>
> Cheers
>
> Tru
>
I Tru,

Thanks for your answer. This morning I spent a long time testing but it
is still not working. "Googling" with? *nicdelay* show me some
interesting documentations about anaconda. I also try:

*ipv6.disable=1*, do disable the IPv6 setup, and *inst.waitfornet=30*
options.

However when the kernel boot I never get any DHCP request to my server.
I can see the DHCP request at PXE boot time, and it works, but none
after dowlnoading vmlinuz and initrd.img.

The only solution was to provide the network setup the grub.cfg file and
a waitfornet instruction:

set timeout=5
? ? menuentry 'Centos7-UEFI-most-most8pc19' {
??? linuxefi centos74/vmlinuz *inst.waitfornet=30 ipv6.disable=1
ip=**/<desktop
IP>/**::**/<gateway>/**:**/<mask>/**:**/<hostname>/**:em1:none
*inst.repo=http:///<server IP>//centos74 inst.ks=http:///<server
IP>//Kickstart7/optiplex9030_uefi_fr.cfg devfs=nomount
??? echo "Loading centos74/initrd.img"
??? initrdefi centos74/initrd.img
??? echo "Booting installation kernel"
}

Realy strange as I boot and autoinstall many other PC from these server.
I also notice that network is set to 100MbFD even if I have Gigabit
switch. May be something related to the e1000 driver provided at boot time.

Patrick