[FS#3616] LAN peers unreachable after a few hours

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Outré (ootrey) 

Attached to Project - OpenWrt/LEDE Project
Summary - LAN peers unreachable after a few hours
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Device: D-Link DIR-882 A1
Version: OpenWrt SNAPSHOT r15710-f5f01bcacd / LuCI Master git-21.029.67968-af1f961

After the router has been booted up for about a day, all LAN peers will become unreachable, but WAN works fine, resulting all LAN applications fail.

I ran a few tests. The Router was 192.168.1.1, a computer assigned 192.168.1.233 and another device 192.168.1.169.

Connection to the router was fine:
  > tracert 192.168.1.1
  Tracing route to OPENWRT.lan [192.168.1.1]
  over a maximum of 30 hops:
    1     2 ms     2 ms     2 ms  OPENWRT.lan [192.168.1.1]
  Trace complete.

Connection to itself was fine:
  > tracert 192.168.1.233
  Tracing route to WINDOWS.lan [192.168.1.233]
  over a maximum of 30 hops:
    1     ping 192.168.1.169
  Pinging 192.168.1.169 with 32 bytes of data:
  Reply from 192.168.1.169: bytes=32 time=4ms TTL=64
  Reply from 192.168.1.169: bytes=32 time=5ms TTL=64
  Reply from 192.168.1.169: bytes=32 time=4ms TTL=64
  Reply from 192.168.1.169: bytes=32 time=4ms TTL=64
  Ping statistics for 192.168.1.169:
      Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
  Approximate round trip times in milli-seconds:
      Minimum = 4ms, Maximum = 5ms, Average = 4ms

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3616

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