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Comment by vbernat | Hacker News Reader

I don't know if this is a typo in the article, but I didn't know that RP filtering would influence how ARP is working. I think it would be better to solve the problem at the root by asking Linux to be more like other OS with:

    sysctl -qw net.ipv4.conf.all.arp_announce=2
    sysctl -qw net.ipv4.conf.all.arp_ignore=1

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This is preventing ARP flux, which is a different issue

https://lwn.net/Articles/45373/

https://serverfault.com/questions/834512/why-does-linux-answ...

https://access.redhat.com/solutions/31284

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.

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