Just a thought: if the reason you are setting up two network interfaces on a system to connect to the same subnet is to use as much as possible of the bandwidth offered by the interfaces, would it not make more sense to configure them as parts of a trunk(4)?
-- Peter N. M. Hansteen, member of the first RFC 1149 implementation team https://bsdly.blogspot.com/ https://www.bsdly.net/ https://www.nuug.no/ "Remember to set the evil bit on all malicious network traffic" delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.