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sending ICMP redirects for multiple on-interface nets
Since 220.127.116.11, ip_forward() has only sent ICMP redirects when the
destination address is in the same subnet as a (random?) address
on the interface. ip_input.c:1385
I have multiple subnets on the same interface, and redirects are not
generated for traffic to another same-interface subnet.
Is this check even needed? Or do we need to iterate through all the
IPv4 networks on the interface checking for a match?
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