There's also net.ipv4.conf.interface.arp_filter. I found it quite confusing to identify exactly which of all of these should be tweaked. I run arp_ignore=1 and

There's also net.ipv4.conf.interface.arp_filter. I found it quite confusing to identify exactly which of all of these should be tweaked. I run arp_ignore=1 and arp_filter=1 on my router to avoid the behavior and it seems to work.