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[Bug 1584042] Missing required logs.

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This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1584042

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1584042

Title:
  Hyper-V NIC cannot pass IPv6 UDP packets by default until protocol
  offload is disabled

Status in linux package in Ubuntu:
  Incomplete

Bug description:

  Hi,

  On a client server, I can't get a response from a name server in ipv6+udp. On the same server, it works fine in tcp.
  If I log on my name server, I can get a response from himself but, as a client, it can't get a response from another name server.

  here are the steps to reproduce : 
  - Create a new server using Ubuntu server 16.04. Set it to use ipv4 and use your preferred name server. Select absolutely nothing as functionality. 
  - check some nslookup and apt-get stuff to verify network is OK
  - add ipv6 to the interface and refer to an IPV6 nameserver. I have 3 and thats why I noticed the problem >> All 3 ipv6 nameservers are filling the 3 places in resolv.conf.
  - if you don't have 3 ipv6 nameservers, just add one and comment the line with the ipv4 name server.
  - verify your resolv.conf. Should only content ipv6 reference.
  - Now, you can't nslookup anymore... 
  - add some tests : "dig @ipv4server google.com" works but "dig @ipv6server google.com" don't

  
  Here a more tests : 

  
  Nameserver1 : Nameserver1.MyDomain :  XXX.YYY.ZZZ.250 / xxxx:yyyy:zzzz::250
  Client 		StandAloneServer.MyDomain		:   XXX.YYY.ZZZ.209 / xxxx:yyyy:zzzz::209

  With IPV4

  
  # dig @XXX.YYY.ZZZ.226 www.google.fr

  /var/log/named/queries.log on Nameserver1:
  20-May-2016 12:25:02.834 queries: info: client XXX.YYY.ZZZ.209#35116 (www.google.fr): query: www.google.fr IN A +E (XXX.YYY.ZZZ.226)

  Tcp Dump on Nameserver1:
  12:25:02.834092 IP StandAloneServer.MyDomain.35116 > Nameserver1.MyDomain.domain: 62949+ [1au] A? www.google.fr. (42)
  12:25:02.834395 IP Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35116: 62949 1/4/5 A 216.58.210.195 (204)

  Tcp Dump on Client
  12:25:02.668200 IP StandAloneServer.MyDomain.35116 > Nameserver1.MyDomain.domain: 62949+ [1au] A? www.google.fr. (42)
  12:25:02.669573 IP Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35116: 62949 1/4/5 A 216.58.210.195 (204)

  
  RESULT:

  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> @XXX.YYY.ZZZ.226 www.google.fr
  ; (1 server found)
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49591
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5
  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4096
  ;; QUESTION SECTION:
  ;www.google.fr.			IN	A
  ;; ANSWER SECTION:
  www.google.fr.		300	IN	A	216.58.210.195
  ;; AUTHORITY SECTION:
  google.fr.		171625	IN	NS	ns1.google.com.
  [TRUNCATED]



  WITH IPV6
  # dig @xxxx:yyyy:zzzz::226 www.google.fr 

  NOTE  : I only asked once, it created 3 queries with 5 secs
  d’intervalle environ

  /var/log/named/queries.log on Nameserver1:
  20-May-2016 12:32:34.902 queries: info: client xxxx:yyyy:zzzz::209#35362 (www.google.fr): query: www.google.fr IN A +E (xxxx:yyyy:zzzz::226)
  20-May-2016 12:32:39.902 queries: info: client xxxx:yyyy:zzzz::209#35362 (www.google.fr): query: www.google.fr IN A +E (xxxx:yyyy:zzzz::226)
  20-May-2016 12:32:44.902 queries: info: client xxxx:yyyy:zzzz::209#35362 (www.google.fr): query: www.google.fr IN A +E (xxxx:yyyy:zzzz::226)

  Tcp Dump on Nameserver1:
  12:32:34.902598 IP6 StandAloneServer.MyDomain.35362 > Nameserver1.MyDomain.domain: 23393+ [1au] A? www.google.fr. (42)
  12:32:34.902994 IP6 Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35362: 23393 1/4/5 A 216.58.210.195 (204)
  …
  12:32:39.902644 IP6 StandAloneServer.MyDomain.35362 > Nameserver1.MyDomain.domain: 23393+ [1au] A? www.google.fr. (42)
  12:32:39.902975 IP6 Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35362: 23393 1/4/5 A 216.58.210.195 (204)
  …
  12:32:39.902644 IP6 StandAloneServer.MyDomain.35362 > Nameserver1.MyDomain.domain: 23393+ [1au] A? www.google.fr. (42)
  12:32:39.902975 IP6 Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35362: 23393 1/4/5 A 216.58.210.195 (204)

  
  Tcp Dump on Client12:32:34.725312 IP6 StandAloneServer.MyDomain.35362 > Nameserver1.MyDomain.domain: 23393+ [1au] A? www.google.fr. (42)
  12:32:34.726036 IP6 Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35362: 23393 1/4/5 A 216.58.210.195 (204)
  …
  12:32:39.725199 IP6 StandAloneServer.MyDomain.35362 > Nameserver1.MyDomain.domain: 23393+ [1au] A? www.google.fr. (42)
  12:32:39.726045 IP6 Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35362: 23393 1/4/5 A 216.58.210.195 (204)
  …
  12:32:44.725288 IP6 StandAloneServer.MyDomain.35362 > Nameserver1.MyDomain.domain: 23393+ [1au] A? www.google.fr. (42)
  12:32:44.725944 IP6 Nameserver1.MyDomain.domain > StandAloneServer.MyDomain.35362: 23393 1/4/5 A 216.58.210.195 (204)

  
  RESULT

  
  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> @xxxx:yyyy:zzzz::226 www.google.fr
  ; (1 server found)
  ;; global options: +cmd
  ;; connection timed out; no servers could be reached

  
  but, if I do the same query with the tcp flag, all is OK : 

  
  # dig +tcp @xxxx:yyyy:zzzz::226 www.google.fr 

  ; <<>> DiG 9.10.3-P4-Ubuntu <<>> +tcp xxxx:yyyy:zzzz::226 www.google.fr
  ; (1 server found)
  ;; global options: +cmd
  ;; Got answer:
  ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41105
  ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5

  ;; OPT PSEUDOSECTION:
  ; EDNS: version: 0, flags:; udp: 4096
  ;; QUESTION SECTION:
  ;www.google.fr.			IN	A

  ;; ANSWER SECTION:
  www.google.fr.		300	IN	A	216.58.210.195

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