fail2ban restarts upon WAN DHCP lease renewal

[andy2301]

Thanks @peci1 for the script and making it easy to install/configure fail2ban on OpenWRT!

I recently found that fail2ban on OpenWRT constantly restarts itself (sometimes 30min or 1-2 hours). And After checking the system.log I found an exact correlation between the fail2ban restart time and the WAN IP DHCP lease renewal time. Unfortunately I cannot control the DHCP lease interval of the WAN service provider. Is there a way to instruct fail2ban to not restart upon WAN IP lease renewal (the WAN IP is the same)? I assume the firewall is auto-reloaded upon WAN IP lease renewal, causing fail2ban to restart.

--- system.log ---

Mon Sep 22 09:11:54 2025 daemon.notice netifd: wan (16548): udhcpc: sending renew to server y.y.y.y
Mon Sep 22 09:11:54 2025 daemon.notice netifd: wan (16548): udhcpc: lease of x.x.x.x obtained from y.y.y.y, lease time 3600

--- fail2ban.log ---

2025-09-22 09:11:57,809 fail2ban.server         [13043]: INFO    Shutdown in progress...
2025-09-22 09:11:57,811 fail2ban.observer       [13043]: INFO    Observer stop ... try to end queue 5 seconds
2025-09-22 09:11:57,834 fail2ban.observer       [13043]: INFO    Observer stopped, 0 events remaining.
2025-09-22 09:11:57,876 fail2ban.server         [13043]: INFO    Stopping all jails

[peci1]

Thanks for the report. Does the restart cause any issues? I'd just take it as a normal part of the firewall reloading process.