I went back to 388.2alpha1 again, becous the method I described in the post
https://www.snbforums.com/threads/a...available-for-select-models.84524/post-836943 didn't work today and the static entry
(192.168.50.254) at ff:ff:ff:ff:ff:ff [ether] PERM on br0 died several times in a row. I noticed a pattern here - if, after rebooting the router, the entry
(192.168.1.254) at ff:ff:ff:ff:ff:ff [ether] PERM on br0 in the console after the
arp -a command is above the entry
(192.168.50.254) at ff:ff:ff:ff:ff:ff [ether] PERM on br0, then the entry
(192.168.50.254) at ff:ff:ff:ff:ff:ff [ether] PERM on br0 does not die, and if it is below, then it dies . I thought it depends on the sequence of lines in the script, but it turned out not.
No need to thank. My diagnostic methods are very primitive, and may give food for thought to Merlin or anyone else with good knowledge in this area. I hope that soon this malfunction will be fixed by someone, and I will be able to update my RT-AX86U to a newer firmware version than 388.2alpha1. In the meantime, I can not afford it, because the work of static entries in ARP is very important to me.