Date: Thu, 21 Apr 2022 09:15:06 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 263288] IPv6 system not responding to Neighbor Solicitation Message-ID: <bug-263288-7501-C28uNhjv6K@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-263288-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-263288-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D263288 --- Comment #11 from Zhenlei Huang <zlei.huang@gmail.com> --- (In reply to wcarson.bugzilla from comment #10) > However in the above debug message it added an extra :1 after ff02 in the= =20 > destination that does not appear in the tcpdump. Is that normal? It may be the embedded form of IPv6 link-local scoped address, see https://docs.freebsd.org/en/books/developers-handbook/ipv6/#ipv6-scope-inde= x . If your host is not for production, try turn on 'net.inet6.icmp6.nd6_onlink_ns_rfc4861' to see if it helps. # sysctl net.inet6.icmp6.nd6_onlink_ns_rfc4861=3D1 Be aware that knob is to prevent CVE-2008-2476, see also https://www.freebsd.org/security/advisories/FreeBSD-SA-08:10.nd6.asc. The symptom is weird, and I could not reproduce it. Do you have multiple fibs? Check these: # sysctl net.fibs # sysctl net.add_addr_allfibs # ifconfig em0 | grep fib It will also be helpful if you provide traffic dumps. # tcpdump -nvi em0 'icmp6' -w dump.pcap and then=20 # service rtsold restart && sleep 3 && ndp -c && ping6 ipv6.google.com --=20 You are receiving this mail because: You are the assignee for the bug.=
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