datapath: add missing interface MAC configuration for BPFOverlay config#44513
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ti-mo merged 1 commit intocilium:mainfrom Mar 4, 2026
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datapath: add missing interface MAC configuration for BPFOverlay config#44513ti-mo merged 1 commit intocilium:mainfrom
ti-mo merged 1 commit intocilium:mainfrom
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The InterfaceMAC field is not filled from the tunnel dev's MAC address. Because of this the BPF program for the overlay resolves to 00:00:00:00:00:00, sending this broken response to the VTEP ARP lookup request. Fixes: cilium#44453 Signed-off-by: akos011221 <orbanakos2001@gmail.com>
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The InterfaceMAC field is not filled from the tunnel dev's MAC address. Because of this the BPF program for the overlay resolves to 00:00:00:00:00:00, sending this broken response to the VTEP ARP lookup request.
It seems to be that the root cause was d296e0d removing the compile time option -DTHIS_INTERFACE_MAC for bpf_overlay.c, but the MAC field was not set in the replacement Go struct.
Fixes: #44453
Fixes: d296e0d