Since updating my EdgeRouter-X (ER-X) from 23.05 to 24.10.2 I notice the following log messages where I have no idea where they are from.
Mon Sep 22 10:30:40 2025 kern.info kernel: [71708.347220] br-lan.1: left allmulticast mode
Mon Sep 22 10:30:40 2025 kern.info kernel: [71708.355892] br-lan: left allmulticast mode
Mon Sep 22 10:30:40 2025 kern.info kernel: [71708.478183] br-lan.1: entered allmulticast mode
Mon Sep 22 10:30:40 2025 kern.info kernel: [71708.487259] br-lan: entered allmulticast mode
Mon Sep 22 10:30:40 2025 kern.info kernel: [71708.496808] mtk_soc_eth 1e100000.ethernet eth0: left allmulticast mode
Mon Sep 22 10:30:40 2025 kern.info kernel: [71708.618071] mtk_soc_eth 1e100000.ethernet eth0: entered allmulticast mode
Mon Sep 22 10:33:22 2025 kern.info kernel: [71870.011464] br-lan.1: left allmulticast mode
Mon Sep 22 10:33:22 2025 kern.info kernel: [71870.020136] br-lan: left allmulticast mode
Mon Sep 22 10:33:22 2025 kern.info kernel: [71870.178551] br-lan.1: entered allmulticast mode
Mon Sep 22 10:33:22 2025 kern.info kernel: [71870.187629] br-lan: entered allmulticast mode
Mon Sep 22 10:33:22 2025 kern.info kernel: [71870.197134] mtk_soc_eth 1e100000.ethernet eth0: left allmulticast mode
Mon Sep 22 10:33:22 2025 kern.info kernel: [71870.318598] mtk_soc_eth 1e100000.ethernet eth0: entered allmulticast mode
Mon Sep 22 10:34:55 2025 kern.info kernel: [71963.374056] br-lan.1: left allmulticast mode
Mon Sep 22 10:34:55 2025 kern.info kernel: [71963.382790] br-lan: left allmulticast mode
Mon Sep 22 10:34:55 2025 kern.info kernel: [71963.488927] br-lan.1: entered allmulticast mode
Mon Sep 22 10:34:55 2025 kern.info kernel: [71963.498014] br-lan: entered allmulticast mode
Mon Sep 22 10:34:55 2025 kern.info kernel: [71963.507524] mtk_soc_eth 1e100000.ethernet eth0: left allmulticast mode
Mon Sep 22 10:34:55 2025 kern.info kernel: [71963.608877] mtk_soc_eth 1e100000.ethernet eth0: entered allmulticast mode
I am aware of that EEE issue on the MT7621 (https://github.com/openwrt/openwrt/issues/17351), but that is resolved in 24.10.2 so should not be related.
I also found another thread (Repeated logs for entered/left allmulticast mode - #10 by nicolas314) where they just installed and configured igmpproxy (but I’m not aware of using multicast at all).
Any ideas?