Date: Mon, 26 Nov 2018 16:12:28 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 233535] Machines lost ping6 after adding same IPv6 address Message-ID: <bug-233535-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D233535 Bug ID: 233535 Summary: Machines lost ping6 after adding same IPv6 address Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: slavash@FreeBSD.org Setup: 2 hosts connected back-to-back=20 # uname -rv 13.0-CURRENT FreeBSD 13.0-CURRENT r340922 GENERIC-NODEBUG Steps to reproduce: 1. Configure IPv6 address on both hosts: HOST A: ifconfig igb0 inet6 2002::1 HOST B: ifconfig igb0 inet6 2002::2 2. Ping to make sure all works: # ping6 2002::2 PING6(56=3D40+8+8 bytes) 2002::1 --> 2002::2 16 bytes from 2002::2, icmp_seq=3D0 hlim=3D64 time=3D0.101 ms 16 bytes from 2002::2, icmp_seq=3D1 hlim=3D64 time=3D0.085 ms ^C --- 2002::2 ping6 statistics --- 2 packets transmitted, 2 packets received, 0.0% packet loss round-trip min/avg/max/std-dev =3D 0.085/0.093/0.101/0.008 ms 3. On both hosts configure the same IP=20 HOST A: ifconfig igb0 inet6 2002::1 HOST B: ifconfig igb0 inet6 2002::2 4. Check ping again # ping6 2002::2 PING6(56=3D40+8+8 bytes) 2002::1 --> 2002::2 ^C --- 2002::2 ping6 statistics --- 7 packets transmitted, 0 packets received, 100.0% packet loss Few notes: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 1. Seems like sometimes need to do step 3 multiple times. 2. Pinging from the other side, may resolve the issue. 3. Issue is reproducing on other NIC vendors. >From tcpdump, I see that the other side is getting the NS messages, but nev= er replies: # tcpdump -nei igb0 host 2002::1 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on igb0, link-type EN10MB (Ethernet), capture size 262144 bytes 18:10:10.176317 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 18:10:11.196325 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 18:10:12.343345 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 18:10:13.377329 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 18:10:14.382334 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 18:10:15.533880 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 18:10:16.583342 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 18:10:17.603347 0c:c4:7a:a8:b7:f6 > 33:33:ff:00:00:02, ethertype IPv6 (0x86= dd), length 86: 2002::1 > ff02::1:ff00:2: ICMP6, neighbor solicitation, who has 2002::2, length 32 ^C 8 packets captured 41 packets received by filter 0 packets dropped by kernel --=20 You are receiving this mail because: You are the assignee for the bug.=
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