IPv6 time-based firewall rules in fw3 do not work as expected — traffic always blocked regardless of schedule

[vika-kr]

Hello OpenWRT team,
I’m reporting an issue with fw3 related to IPv6 time-based firewall rules. When using scheduled rules (via start_time, stop_time, and weekdays) to allow or deny traffic, the behavior is inconsistent for IPv6 — traffic is always blocked, regardless of the configured time window.

Observation

• The rule is correctly translated into ip6tables using -m time, but the traffic does not follow the schedule.
• Even when an ACCEPT rule is configured with a time window, traffic is still blocked.
• This issue does not occur with IPv4 — only IPv6 is affected.
• The final DROP rule in the chain always takes precedence, suggesting the time match is not working for IPv6.

Example Rule:
ip6tables -A zone_wan_forward -p tcp -m tcp --dport 5000 -m time --timestart 12:00:00 --timestop 12:59:59 --kerneltz -m comment --comment "!fw3: test_ipv6" -j zone_lan_dest_ACCEPT

Expected behavior: traffic should be blocked only between 13:53 and 13:55.
Actual behavior: traffic is blocked outside the time window as well.

[brada4]

Likely UPNP unicast is blocked at your provider. Check with tcpdump if anything at all arrives on the port.