Date: Tue, 21 Oct 2025 19:34:44 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 290407] IPv6 MLD (Multicast Listener Discovery) packets do not contain Router Alert Message-ID: <bug-290407-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290407 Bug ID: 290407 Summary: IPv6 MLD (Multicast Listener Discovery) packets do not contain Router Alert Product: Base System Version: 15.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: dennypage@me.com IPv6 Multicast Listener Discovery packets, specifically Multicast Listener Reports, do not contain a Router Alert option as required by the Multicast Listener Discovery RFCs. The lack of a Router Alert option causes Listener Report packets to be discarded by receivers. Specifics from the RFCs: * RFC 2710 (MLDv1) Section 3: All MLD messages described in this document are sent with a link-local IPv6 Source Address, an IPv6 Hop Limit of 1, and an IPv6 Router Alert option [RTR-ALERT: RFC2711] in a Hop-by-Hop Options header. * RFC 3810 & RFC 9777 (MLDv2) Section 5: All MLDv2 messages described in this document MUST be sent with a link-local IPv6 Source Address, an IPv6 Hop Limit of 1, and an IPv6 Router Alert option [RFC2711] in a Hop-by-Hop Options header. * RFC 3810 & RFC 9777 (MLDv2) Section 7.4: Upon reception of an MLD message that contains a Report, the router checks if the source address of the message is a valid link-local address, if the Hop Limit is set to 1, and if the Router Alert option is present in the Hop-by-Hop Options header of the IPv6 packet. If any of these checks fail, the packet is dropped. -- You are receiving this mail because: You are the assignee for the bug.home | help
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