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🐛 Fix DHCPv6 PXE boot: use option6:61 for arch detection #917

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Merged
metal3-io-bot merged 2 commits into from
Mar 2, 2026
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🐛 Fix DHCPv6 PXE boot: use option6:61 for arch detection #917

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5810188
Fix DHCPv6 PXE boot: use option6:client-arch for architecture detection
holmboe Feb 16, 2026
4825130
Play it safe with option6:61 instead of option6:client-arch
holmboe Feb 19, 2026
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13 changes: 8 additions & 5 deletions ironic-config/dnsmasq.conf.j2
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Original file line number Diff line number Diff line change
Expand Up @@ -56,15 +56,18 @@ ra-param={{ env.PROVISIONING_INTERFACE }},0,0

dhcp-vendorclass=set:pxe6,enterprise:343,PXEClient
dhcp-userclass=set:ipxe6,iPXE
# option6:client-arch is not defined in dnsmasq upstream, resort to architecture
# detection via DHCPv6 option 61 (RFC 5970)
# Client is (i)PXE booting on EFI machine
dhcp-match=set:amd64,option:client-arch,7
dhcp-match=set:amd64,option:client-arch,9
dhcp-match=set:amd64,option6:61,7
dhcp-match=set:amd64,option6:61,9
dhcp-option=tag:pxe6,tag:amd64,option6:bootfile-url,tftp://{{ env.IRONIC_URL_HOST }}/snponly-x86_64.efi
# Client is (i)PXE booting on arm64 EFI machine
dhcp-match=set:arm64,option:client-arch,11
dhcp-match=set:arm64,option6:61,11
dhcp-option=tag:pxe6,tag:arm64,option6:bootfile-url,tftp://{{ env.IRONIC_URL_HOST }}/snponly-arm64.efi
# Client is running (i)PXE on BIOS machine
dhcp-option=tag:!pxe6,option6:bootfile-url,tftp://{{ env.IRONIC_URL_HOST }}/undionly.kpxe
# Fallback: serve x86_64 when PXE client is detected but architecture
# could not be determined. Legacy BIOS does not support IPv6 PXE.
dhcp-option=tag:pxe6,tag:!amd64,tag:!arm64,option6:bootfile-url,tftp://{{ env.IRONIC_URL_HOST }}/snponly-x86_64.efi
{%- if env.IPXE_TLS_SETUP != "true" %}
dhcp-option=tag:ipxe6,option6:bootfile-url,{{ env.IRONIC_HTTP_URL }}/boot.ipxe
{% endif %}
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