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Message #181151
[Bug 1584042] Re: Hyper-V NIC cannot pass IPv6 UDP packets by default until protocol offload is disabled
root@Client:/home/ssi# uname -a
Linux Client 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
root@Client:/home/ssi# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: denial
root@Client:/home/ssi# lsblk -o NAME,SIZE
NAME SIZE
fd0 4K
sda 15G
├─sda1 487M
├─sda2 1K
└─sda5 14.5G
├─Client--vg-root 13.5G
└─Client--vg-swap_1 1G
sr0 1024M
root@Client:/home/ssi# lspci
00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (AGP disabled) (rev 03)
00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 01)
00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual VGA
root@Client:/home/ssi# lshw -sanitize
computer
description: Computer
width: 64 bits
capabilities: smbios-2.3 vsyscall32
*-core
description: Motherboard
physical id: 0
*-memory
description: System memory
physical id: 0
size: 983MiB
*-cpu
product: Intel(R) Xeon(R) CPU E5507 @ 2.27GHz
vendor: Intel Corp.
physical id: 1
bus info: cpu@0
width: 64 bits
capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx x86-64 constant_tsc rep_good nopl pni ssse3 cx16 sse4_1 sse4_2 popcnt hypervisor lahf_lm
*-pci
description: Host bridge
product: 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (AGP disabled)
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 03
width: 32 bits
clock: 33MHz
*-isa
description: ISA bridge
product: 82371AB/EB/MB PIIX4 ISA
vendor: Intel Corporation
physical id: 7
bus info: pci@0000:00:07.0
version: 01
width: 32 bits
clock: 33MHz
capabilities: isa bus_master
configuration: latency=0
*-ide
description: IDE interface
product: 82371AB/EB/MB PIIX4 IDE
vendor: Intel Corporation
physical id: 7.1
bus info: pci@0000:00:07.1
version: 01
width: 32 bits
clock: 33MHz
capabilities: ide bus_master
configuration: driver=ata_piix latency=0
resources: irq:0 ioport:1f0(size=8) ioport:3f6 ioport:170(size=8) ioport:376 ioport:ffa0(size=16)
*-bridge UNCLAIMED
description: Bridge
product: 82371AB/EB/MB PIIX4 ACPI
vendor: Intel Corporation
physical id: 7.3
bus info: pci@0000:00:07.3
version: 02
width: 32 bits
clock: 33MHz
capabilities: bridge
configuration: latency=0
*-display
description: VGA compatible controller
product: Hyper-V virtual VGA
vendor: Microsoft Corporation
physical id: 8
bus info: pci@0000:00:08.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: vga_controller bus_master rom
configuration: driver=hyperv_fb latency=0
resources: irq:11 memory:f8000000-fbffffff
*-scsi:0
physical id: 2
logical name: scsi1
capabilities: emulated
*-cdrom
description: DVD reader
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/cdrom
logical name: /dev/dvd
logical name: /dev/sr0
capabilities: audio dvd
configuration: status=nodisc
*-scsi:1
physical id: 3
logical name: scsi2
*-disk
description: SCSI Disk
physical id: 0.0.0
bus info: scsi@2:0.0.0
logical name: /dev/sda
size: 15GiB (16GB)
capabilities: partitioned partitioned:dos
configuration: logicalsectorsize=512 sectorsize=4096 signature=053b3857
*-volume:0
description: Linux filesystem partition
vendor: Linux
physical id: 1
bus info: scsi@2:0.0.0,1
logical name: /dev/sda1
logical name: /boot
version: 1.0
serial: [REMOVED]
size: 487MiB
capacity: 487MiB
capabilities: primary bootable extended_attributes large_files ext2 initialized
configuration: filesystem=ext2 lastmountpoint=/boot modified=2016-05-27 06:13:26 mount.fstype=ext2 mount.options=rw,relatime,block_validity,barrier,user_xattr,acl,stripe=4 mounted=2016-05-27 03:14:05 state=mounted
*-volume:1
description: Extended partition
physical id: 2
bus info: scsi@2:0.0.0,2
logical name: /dev/sda2
size: 14GiB
capacity: 14GiB
capabilities: primary extended partitioned partitioned:extended
*-logicalvolume
description: Linux LVM Physical Volume partition
physical id: 5
logical name: /dev/sda5
serial: [REMOVED]
size: 14GiB
capacity: 14GiB
capabilities: multi lvm2
*-network
description: Ethernet interface
physical id: 1
logical name: eth0
serial: [REMOVED]
capabilities: ethernet physical
configuration: broadcast=yes driver=hv_netvsc firmware=N/A link=yes multicast=yes
--
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Packages, which is subscribed to linux in Ubuntu.
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:
Confirmed
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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