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linux:openwrt:issues:mt7621_arp_broadcast [2024/02/11 10:59] – created niziaklinux:openwrt:issues:mt7621_arp_broadcast [2025/01/22 17:25] (current) – niziak
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-====== MT7621 arp broadcast ======+====== MT7621 arp broadcast issue ======
  
 Symptoms: Symptoms:
-  * all wifi clients has internet access +  * all WiFi clients has internet access 
-  * after some time, cannot reach wifi client from another client+  * after some time, cannot reach WiFi client from another client (WiFi or Wired)
  
 Affected routers: Affected routers:
-  * Netgear R6220 MediaTek MT7621 ver:1 eco:3+  * My devices: Netgear R6220 MediaTek MT7621 ver:1 eco:3 
 +  * D-Link DIR-882 (MediaTek MT7621A SoC) 
 +  * Cudy WR2100, MT7621 chipset, MT7603E Wifi.
  
 Problem introduced by Kernel: [[https://lkml.org/lkml/2022/5/10/253|[PATCH v2] net: dsa: tag_mtk: add padding for tx packets]] Problem introduced by Kernel: [[https://lkml.org/lkml/2022/5/10/253|[PATCH v2] net: dsa: tag_mtk: add padding for tx packets]]
  
-OpenWrt issue: [[https://github.com/openwrt/openwrt/issues/11942| ARP/broadcast issues for wireless clients on Mediatek-based routers using OpenWrt as dumb AP in pfSense/OPNsense bridged LAN firewall setups on 22.03.3 release, present since OpenWrt 22.03.0-rc2 #11942 ]]+OpenWrt issue:  
 +  * [[https://github.com/openwrt/openwrt/issues/11942|ARP/broadcast issues for wireless clients on Mediatek-based routers using OpenWrt as dumb AP in pfSense/OPNsense bridged LAN firewall setups on 22.03.3 release, present since OpenWrt 22.03.0-rc2 #11942]] 
 +  * [[https://forum.openwrt.org/t/device-stops-passing-broadcast-packets-to-wireless-interfaces-after-24h-of-uptime/79426|Device stops passing broadcast packets to wireless interfaces after 24H of uptime]] 
 +  * Other chipsets - similar problem: [[https://github.com/openwrt/openwrt/issues/9555|ARP requests are not forwarded to Wifi Client after some time --> devices unreachable #9555]] 
 +  * Maybe related [[https://forum.openwrt.org/t/clients-in-same-wlan-cant-reach-each-other/2501|Clients in same WLAN can’t reach each other]]
  
-Fixed in:+  * [[https://github.com/openwrt/mt76/issues/598|broadcasts delivery problem #598]] 
 + 
 +Reported as fixed in:
   * r22186-9307c2753980   * r22186-9307c2753980
 +  * >= v22.03.4
 +
 +Problem still occurs in:
 +  * OpenWrt 23.05-SNAPSHOT r24041-a07a531329
 +
 +Potential fix: 
 +  * [[https://lore.kernel.org/linux-wireless/Z2Q9POuV-6MIdzRf@pilgrim/T/#t|Re: Potential Broadcast Issues After GTK Key Exchange on ath11k with IPQ8072A (QCN5024/QCN5054)]]
 +  * [[https://github.com/openwrt/openwrt/issues/9555#issuecomment-2563690019]]
 +
 +Workaround:
 +  * execute command `wifi` on remote OpenWrt