Re: [PATCH] net:ipv4: Packet is not forwarded if bc_forwarding not configured on ingress interface
From: David Ahern
Date: Sun Feb 28 2021 - 22:21:26 EST
On 2/28/21 5:53 PM, Henry Shen wrote:
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When an IPv4 packet with a destination address of broadcast is received
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on an ingress interface, it will not be forwarded out of the egress
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interface if the ingress interface is not configured with bc_forwarding
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but the egress interface is. If both the ingress and egress interfaces
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are configured with bc_forwarding, the packet can be forwarded
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successfully.
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This patch is to be inline with Cisco's implementation that packet can be
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forwarded if ingress interface is NOT configured with bc_forwarding,
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but egress interface is.
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In Linux, forwarding decisions are made based on the ingress device, not
the egress device.