networking protocol_error ai_generated partial

MLDv2: no multicast listener report received for group ff02::1:ff00:1234 on eth0

ID: networking/mldv2-query-no-report

Also available as: JSON · Markdown · 中文

82%Fix Rate

84%Confidence

1Evidence

2024-08-22First Seen

Version Compatibility

Version	Status	Introduced	Deprecated	Notes
Linux kernel 6.5	active	—	—	—
OpenWrt 23.05	active	—	—	—
Cisco IOS XE 17.9	active	—	—	—

Root Cause

The multicast querier sent an MLDv2 query for a specific IPv6 group but received no listener report, indicating no active listeners on the segment.

generic

中文

多播查询器发送了针对特定IPv6组的MLDv2查询，但未收到任何监听者报告，表明该网段上没有活跃的监听者。

Official Documentation

https://datatracker.ietf.org/doc/html/rfc3810

Workarounds

85% success Verify multicast application is running and listening: netstat -an | grep -E 'ff02::1:ff00:1234' ; if missing, restart the application that joins the group
```
Verify multicast application is running and listening: netstat -an | grep -E 'ff02::1:ff00:1234' ; if missing, restart the application that joins the group
```
80% success Check firewall rules on the host that may block MLD reports: sudo ip6tables -L -n | grep mld ; add allow rule if needed: ip6tables -A INPUT -p icmpv6 --icmpv6-type 143 -j ACCEPT
```
Check firewall rules on the host that may block MLD reports: sudo ip6tables -L -n | grep mld ; add allow rule if needed: ip6tables -A INPUT -p icmpv6 --icmpv6-type 143 -j ACCEPT
```

中文步骤

Verify multicast application is running and listening: netstat -an | grep -E 'ff02::1:ff00:1234' ; if missing, restart the application that joins the group

Check firewall rules on the host that may block MLD reports: sudo ip6tables -L -n | grep mld ; add allow rule if needed: ip6tables -A INPUT -p icmpv6 --icmpv6-type 143 -j ACCEPT

Dead Ends

Common approaches that don't work:

80% fail
If no listeners exist, increasing the interval only delays detection; it does not create listeners.
70% fail
This may cause flooding but does not fix the missing report; the issue is at the host level.