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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-key

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https://bugs.launchpad.net/bugs/1502238

Title:
  bridge does not forward neighbor solicitation packets

Status in linux package in Ubuntu:
  Triaged

Bug description:
  3 hosts involved here:
  kailan is connected to a cisco switch, which is also connected to kurrat (eth3), which is running a bridge with tigernut connected to eth1.

  kurrat's controllers are 06:00.0 Ethernet controller: Intel
  Corporation 82574L Gigabit Network Connection, using the e1000e driver
  (3.13.0-65-generic kernel)

  (while kailan is doing a ping6
  2601:282:8100:3500:82ee:73ff:fe99:368d):

  +kurrat 324 : sudo tcpdump -eni eth3 ip6 and not tcp and not udp
  tcpdump: WARNING: eth3: no IPv4 address assigned
  tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
  listening on eth3, link-type EN10MB (Ethernet), capture size 65535 bytes
  10:39:16.080888 00:1c:c0:83:32:40 > 33:33:ff:99:36:8d, ethertype IPv6 (0x86dd), length 86: 2601:282:8100:3500::1 > ff02::1:ff99:368d: ICMP6, neighbor solicitation, who has 2601:282:8100:3500:82ee:73ff:fe99:368d, length 32
  10:39:16.431484 00:1c:c0:83:32:40 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 110: fe80::21c:c0ff:fe83:3240 > ff02::1: ICMP6, router advertisement, length 56
  10:39:17.077446 00:1c:c0:83:32:40 > 33:33:ff:99:36:8d, ethertype IPv6 (0x86dd), length 86: 2601:282:8100:3500::1 > ff02::1:ff99:368d: ICMP6, neighbor solicitation, who has 2601:282:8100:3500:82ee:73ff:fe99:368d, length 32
  10:39:18.077457 00:1c:c0:83:32:40 > 33:33:ff:99:36:8d, ethertype IPv6 (0x86dd), length 86: 2601:282:8100:3500::1 > ff02::1:ff99:368d: ICMP6, neighbor solicitation, who has 2601:282:8100:3500:82ee:73ff:fe99:368d, length 32
  10:39:19.095034 00:1c:c0:83:32:40 > 33:33:ff:99:36:8d, ethertype IPv6 (0x86dd), length 86: 2601:282:8100:3500::1 > ff02::1:ff99:368d: ICMP6, neighbor solicitation, who has 2601:282:8100:3500:82ee:73ff:fe99:368d, length 32
  10:39:20.093436 00:1c:c0:83:32:40 > 33:33:ff:99:36:8d, ethertype IPv6 (0x86dd), length 86: 2601:282:8100:3500::1 > ff02::1:ff99:368d: ICMP6, neighbor solicitation, who has 2601:282:8100:3500:82ee:73ff:fe99:368d, length 32
  10:39:21.093425 00:1c:c0:83:32:40 > 33:33:ff:99:36:8d, ethertype IPv6 (0x86dd), length 86: 2601:282:8100:3500::1 > ff02::1:ff99:368d: ICMP6, neighbor solicitation, who has 2601:282:8100:3500:82ee:73ff:fe99:368d, length 32
  10:39:21.430000 00:1c:c0:83:32:40 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 110: fe80::21c:c0ff:fe83:3240 > ff02::1: ICMP6, router advertisement, length 56
  10:39:22.111042 00:1c:c0:83:32:40 > 33:33:ff:99:36:8d, ethertype IPv6 (0x86dd), length 86: 2601:282:8100:3500::1 > ff02::1:ff99:368d: ICMP6, neighbor solicitation, who has 2601:282:8100:3500:82ee:73ff:fe99:368d, length 32
  ^C
  10 packets captured
  11 packets received by filter
  0 packets dropped by kernel
  +kurrat 325 : sudo tcpdump -eni eth1 ip6 and not tcp and not udp
  tcpdump: WARNING: eth1: no IPv4 address assigned
  tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
  listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
  10:39:28.201110 00:1c:c0:83:32:40 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 110: fe80::21c:c0ff:fe83:3240 > ff02::1: ICMP6, router advertisement, length 56
  10:39:31.552677 00:1c:c0:83:32:40 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 110: fe80::21c:c0ff:fe83:3240 > ff02::1: ICMP6, router advertisement, length 56
  10:39:38.103919 08:10:78:fc:b3:d2 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 90: fe80::a10:78ff:fefc:b3d2 > ff02::1: HBH ICMP6, multicast listener query v2 [gaddr ::], length 28
  10:39:39.663357 00:1c:c0:83:32:40 > 33:33:00:00:00:01, ethertype IPv6 (0x86dd), length 110: fe80::21c:c0ff:fe83:3240 > ff02::1: ICMP6, router advertisement, length 56
  ^C
  4 packets captured
  4 packets received by filter
  0 packets dropped by kernel
  1 packet dropped by interface
  +kurrat 326 : uname -a
  Linux kurrat 3.13.0-65-generic #105-Ubuntu SMP Mon Sep 21 18:50:58 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  Adding a host route for the 2001:: IP via the link IP on kailan works
  as a workaround, but the neighbor solicitiation packets are clearly
  not getting through the bridge.

  No firewall is configured on kurrat.

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