Bug 1732765

Summary: UEFI HTTP boot over IPv6 does not work
Product: Red Hat Enterprise Linux 7 Reporter: Lukas Zapletal <lzap>
Component: grub2Assignee: Javier Martinez Canillas <fmartine>
Status: ON_QA --- QA Contact: Release Test Team <release-test-team>
Severity: high Docs Contact:
Priority: high    
Version: 7.9CC: fmartine, jwboyer, lmiksik, pjanda, tbowling
Target Milestone: rcKeywords: TestCaseNeeded
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Fixed In Version: grub2-2.02-0.82.el7 Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
Libvirt VM screenshot none

Description Lukas Zapletal 2019-07-24 10:07:22 UTC

I am trying to configure UEFI HTTP Boot over IPv6 with Grub2. Here is my dhcp config:

option dhcp6.bootfile-url code 59 = string;
option dhcp6.vendor-class code 16 = {integer 32, integer 16, string};

subnet6 2001:db8:f00f:cafe::/64 {
 range6 2001:db8:f00f:cafe::42:10 2001:db8:f00f:cafe::42:99;
 option dhcp6.bootfile-url "http://[2001:db8:f00f:cafe::1]/httpboot/grub2/grubx64.efi";
 option dhcp6.name-servers 2001:db8:f00f:cafe::1;
 option dhcp6.vendor-class 0 10 "HTTPClient";

Grub2 loads fine, loads configuration which is:

set default=0
set timeout=10
menuentry 'Kickstart default PXEGrub2' {
  linuxefi boot/centos-local-proxy-NpAPvFVIy69k-vmlinuz ks=http://sat66.nat.lan/unattended/provision?token=d716ee59-fabf-40f6-8b21-9a6a14c47c2e  network ksdevice=bootif ks.device=bootif BOOTIF=00-00-c0-3a-d1-01-8f kssendmac ks.sendmac inst.ks.sendmac BOOTIF=01-$net_default_mac
  initrdefi boot/centos-local-proxy-NpAPvFVIy69k-initrd.img

However after the timeout there is a network error. Depending on bootfile-url it's different:

For http://[2001:db8:f00f:cafe::1] I get: unrecognised network address '2001:db8:f00f:cafe::1', unsupported uefi http status code 0x11, fail to receive a reponse! status=104

For http://ipv6_only_hostname I get: unrecognised network address 'ipv6_only_hostname'

Is IPv6 supported in this scenario? Thanks.

Comment 2 Lukas Zapletal 2020-01-28 13:38:21 UTC
With most recent grub2-2.02-0.80.el7 I only get "unrecognised network address" error. Looks like there is a message "Press any key to continue..." and after a short delay the system boots up. I made a photo of this.

Not sure if this is relevant, but *randomly* grub2 also fails to load the file with "invalid magic number". This happens on LAN and this is HTTP Boot so unlikely a TFTP packet drop. Attaching too.

Comment 3 Lukas Zapletal 2020-02-26 09:56:58 UTC
Created attachment 1665899 [details]
Libvirt VM screenshot

Comment 4 Javier Martinez Canillas 2020-03-07 10:59:50 UTC
I was able to reproduce this issue and the problem was that GRUB was not enclosing the literal IPv6 address in square brackets when writing the Host field of the HTTP request header.

Comment 9 Petr Janda 2020-03-25 11:50:23 UTC
Reproduced on RHEL-7.8-20200225.1 x86_64 Server