Enable receiving ICMP redirect message

Hello, I am using 22.03.5 and trying to enable receiving ICMP redirect.

Wiki says that accept_redirects at /etc/config/firewall control ICMP redirect.
I added option accept_redirects '1' on default section.
But no temporary route generated nor kernel parameter modified.

# ip route show cache
# sysctl net.ipv4 | grep redirects
net.ipv4.conf.all.accept_redirects = 0

I remove the line option accept_redirects '1' from /etc/config/firewall and
added net.ipv4.conf.all.accept_redirects = 1 at /etc/sysctl.conf.

# ip route show cache via dev br-lan.1
cache expires 290sec

This is expected result.

I'd like to know proper config to enable receiving ICMP redirect.

Thank you.