[ovirt-users] virt-in-virt problem: DHCP failing for a container in a oVirt VM

Simone Tiraboschi stirabos at redhat.com
Mon May 9 03:53:53 EDT 2016


On Sat, May 7, 2016 at 11:06 AM, Yaniv Kaul <ykaul at redhat.com> wrote:
>
>
> On Fri, May 6, 2016 at 11:07 PM, Will Dennis <wdennis at nec-labs.com> wrote:
>>
>> That’s in iptables, right? I have iptables disabled on my oVirt nodes...
>
>
> No, it's a L2 filter libvirt sets up, I believe using ebtables.
> Y.


There is also a specific VDSM hook to address this configuration:
https://github.com/oVirt/vdsm/tree/master/vdsm_hooks/macspoof

>>
>>
>>
>> From: Yaniv Kaul [mailto:ykaul at redhat.com]
>> Sent: Friday, May 06, 2016 3:50 PM
>> To: Will Dennis
>> Subject: Re: [ovirt-users] virt-in-virt problem: DHCP failing for a
>> container in a oVirt VM
>>
>>
>>
>> Long shot - you need to disable the EnableMACAntiSpoofingFilterRules .
>>
>> Y.
>>
>>
>>
>> On Fri, May 6, 2016 at 8:27 PM, Will Dennis <wdennis at nec-labs.com> wrote:
>>
>> Hi all,
>>
>>
>>
>> Have an interesting problem – I am running a VM in oVirt that is running
>> Proxmox VE 4.1 OS, which I have spun up a container on.  The container is
>> set for DHCP, and I have verified that it is sending Discover packets as
>> normal, and that these packets are making it out of the Proxmox VM to the
>> oVirt bridge (which is attached to a VLAN sub-interface of a bond
>> interface.) However, these packets do NOT make it past the oVirt bridge. The
>> interesting thing is that the Proxmox VM (as well as any other VM I spin up
>> on oVirt) works fine with DHCP. (I also have other oVirt VMs instantiated
>> which are using LXD to spin up containers, and I have the same problem with
>> those as well.) I checked a bunch of stuff, and the only clue I could find
>> is that it seems that the oVirt bridge is not learning the MAC for the
>> container on the VM, even though it does learn the VM’s MAC, but I can
>> capture DHCP traffic coming from the container off the ‘vnet0’ interface
>> which is joined to that bridge...
>>
>>
>>
>> Info:
>>
>>
>>
>> ===== off Proxmox VM =====
>>
>>
>>
>> Container's MAC address: 32:62:65:61:65:33
>>
>>
>>
>> root at proxmox-02:~# ip link sh
>>
>> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
>> DEFAULT group default
>>
>>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>>
>> 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
>> master vmbr0 state UP mode DEFAULT group default qlen 1000
>>
>>     link/ether 00:1a:4a:16:01:57 brd ff:ff:ff:ff:ff:ff
>>
>> 3: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
>> UP mode DEFAULT group default
>>
>>     link/ether 00:1a:4a:16:01:57 brd ff:ff:ff:ff:ff:ff
>>
>> 7: veth100i0 at if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
>> pfifo_fast master vmbr0 state UP mode DEFAULT group default qlen 1000
>>
>>     link/ether fe:50:4f:3c:bd:b8 brd ff:ff:ff:ff:ff:ff link-netnsid 0
>> <<< veth connection to container
>>
>>
>>
>> root at proxmox-02:~# brctl showmacs vmbr0
>>
>> port no mac addr                is local?       ageing timer
>>
>>   1     00:12:3f:24:a4:54       no               112.88
>>
>>   1     00:1a:4a:16:01:56       no                 0.02
>>
>>   1     00:1a:4a:16:01:57       yes                0.00
>>
>>   1     00:1a:4a:16:01:57       yes                0.00
>>
>>   1     00:24:50:dd:a2:05       no                 1.37
>>
>>   1     18:03:73:e3:be:5a       no                21.04
>>
>>   1     18:03:73:e3:ca:24       no                 4.23
>>
>>   1     18:03:73:e3:cb:5b       no                48.41
>>
>>   1     18:03:73:e3:cc:e5       no                91.93
>>
>>   1     18:03:73:e3:cd:b8       no               151.04
>>
>>   1     18:03:73:e3:ce:43       no                 0.80
>>
>>   1     18:03:73:e3:d0:a4       no               290.74
>>
>>   1     18:03:73:e3:d4:26       no                34.06
>>
>>   1     18:03:73:e3:d5:3d       no                 6.36
>>
>>   1     18:03:73:e4:23:08       no                88.76
>>
>>   1     18:03:73:e4:25:92       no               111.86
>>
>>   1     18:03:73:e4:26:2f       no                 9.54
>>
>>   1     18:03:73:e4:2b:4c       no               114.86
>>
>>   1     18:03:73:e4:31:15       no               263.91
>>
>>   1     18:03:73:e4:6c:19       no                 6.36
>>
>>   1     18:03:73:e4:7e:0a       no               103.06
>>
>>   1     18:03:73:e8:16:e0       no                23.21
>>
>>   2     32:62:65:61:65:33       no                 5.08   <<< container’s
>> MAC learned on Proxmox bridge
>>
>>   1     34:17:eb:9b:e0:29       no               265.22
>>
>>   1     34:17:eb:9b:f8:ea       no               114.86
>>
>>   1     44:d3:ca:7e:3c:ff       no                 0.00
>>
>>   1     78:2b:cb:3b:ca:b9       no               284.70
>>
>>   1     78:2b:cb:92:cb:cb       no               279.70
>>
>>   1     78:2b:cb:93:08:a8       no               287.05
>>
>>   1     b8:ca:3a:7a:70:63       no                 4.83
>>
>>   1     f8:bc:12:69:bb:a3       no               121.82
>>
>>   2     fe:50:4f:3c:bd:b8       yes                0.00
>>
>>   2     fe:50:4f:3c:bd:b8       yes                0.00
>>
>>
>>
>> ===== off oVirt node that has Proxmox VM ====
>>
>>
>>
>> (relevant lines from ‘ip link show’)
>>
>> 2: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue
>> state UP mode DEFAULT
>>
>> 3: enp4s0f0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc
>> pfifo_fast master bond0 state UP mode DEFAULT qlen 1000
>>
>> 4: enp4s0f1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc
>> pfifo_fast master bond0 state UP mode DEFAULT qlen 1000
>>
>> 8: bond0.169 at bond0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
>> noqueue master 169-net state UP mode DEFAULT
>>
>> 10: bond0.180 at bond0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
>> noqueue master 180-net state UP mode DEFAULT
>>
>> 12: bond0.207 at bond0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc
>> noqueue master 207-net state UP mode DEFAULT
>>
>> 13: 207-net: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
>> state UP mode DEFAULT
>>
>> 30: vnet0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
>> master 207-net state UNKNOWN mode DEFAULT qlen 500 <<< veth connection to
>> Proxmox VM
>>
>> 31: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
>> master 207-net state UNKNOWN mode DEFAULT qlen 500
>>
>>
>>
>> [root at ovirt-node-03 ~]# brctl show
>>
>> bridge name     bridge id               STP enabled     interfaces
>>
>> 169-net         8000.0015177be9da       no              bond0.169
>>
>> 180-net         8000.0015177be9da       no              bond0.180
>>
>> 207-net         8000.0015177be9da       no              bond0.207
>>
>>                                                         vnet0
>>
>>                                                         vnet1
>>
>> ;vdsmdummy;     8000.000000000000       no
>>
>> ovirtmgmt       8000.00218535086a       no              enp12s0f0
>>
>>
>>
>>
>>
>> [root at ovirt-node-03 ~]# tcpdump -i vnet0 -vvv -s 1500 '(port 67 or port
>> 68)'
>>
>> tcpdump: WARNING: vnet0: no IPv4 address assigned
>>
>> tcpdump: listening on vnet0, link-type EN10MB (Ethernet), capture size
>> 1500 bytes
>>
>> 12:52:07.628571 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto
>> UDP (17), length 328)
>>
>>     0.0.0.0.bootpc > 255.255.255.255.bootps: [udp sum ok] BOOTP/DHCP,
>> Request from 32:62:65:61:65:33 (oui Unknown), length 300, xid 0x9efc4849,
>> secs 94, Flags [none] (0x0000)
>>
>>           Client-Ethernet-Address 32:62:65:61:65:33 (oui Unknown)
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>
>>           Vendor-rfc1048 Extensions
>>
>>             Magic Cookie 0x63825363
>>
>>             DHCP-Message Option 53, length 1: Discover
>>
>>             Hostname Option 12, length 5: "test1"
>>
>>             Parameter-Request Option 55, length 13:
>>
>>               Subnet-Mask, BR, Time-Zone, Default-Gateway
>>
>>               Domain-Name, Domain-Name-Server, Option 119, Hostname
>>
>>               Netbios-Name-Server, Netbios-Scope, MTU,
>> Classless-Static-Route
>>
>>               NTP
>>
>>             END Option 255, length 0
>>
>>             PAD Option 0, length 0, occurs 34
>>
>>
>>
>>
>>
>> [root at ovirt-node-03 ~]# brctl showmacs 207-net
>>
>> port no mac addr                is local?       ageing timer
>>
>>   1     00:15:17:7b:e9:da       yes                0.00
>>
>>   1     00:15:17:7b:e9:da       yes                0.00
>>
>>   3     00:1a:4a:16:01:56       no                 0.11
>>
>>   2     00:1a:4a:16:01:57       no                 0.13  << Proxmox VM's
>> eth0 MAC learned
>>
>>   1     00:24:50:dd:a2:05       no                 1.05
>>
>>   1     18:03:73:e3:be:5a       no               198.87
>>
>>   1     18:03:73:e3:ca:24       no                60.01
>>
>>   1     18:03:73:e3:cb:5b       no                68.26
>>
>>   1     18:03:73:e3:cd:b8       no                41.39
>>
>>   1     18:03:73:e3:d4:26       no                57.25
>>
>>   1     18:03:73:e3:d5:3d       no               133.53
>>
>>   1     18:03:73:e4:23:08       no                34.28
>>
>>   1     18:03:73:e4:26:2f       no                20.10
>>
>>   1     18:03:73:e4:2b:4c       no                22.49
>>
>>   1     18:03:73:e4:6c:19       no                14.87
>>
>>   1     18:03:73:e4:7e:0a       no                54.46
>>
>>   1     18:03:73:e8:16:e0       no                28.71
>>
>>   1     34:17:eb:9b:f8:ea       no                22.49
>>
>>   1     44:d3:ca:7e:3c:ff       no                 0.60
>>
>>   1     78:2b:cb:3b:ca:b9       no               217.66
>>
>>   1     78:2b:cb:92:cb:cb       no               194.18
>>
>>   1     78:2b:cb:93:08:a8       no               102.49
>>
>>   1     b8:ca:3a:7a:70:63       no                 4.19
>>
>>   1     f8:bc:12:69:bb:a3       no               110.52
>>
>>   3     fe:1a:4a:16:01:56       yes                0.00  <<< veth
>> connection to Proxmox VM (veth0)
>>
>>   3     fe:1a:4a:16:01:56       yes                0.00
>>
>>   2     fe:1a:4a:16:01:57       yes                0.00
>>
>>   2     fe:1a:4a:16:01:57       yes                0.00
>>
>> (notice no other entries for port 3 – should be learning MAC
>> 32:62:65:61:65:33 from incoming traffic on vnet0)
>>
>>
>>
>> =====
>>
>>
>>
>>
>>
>>
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>>
>
>
>
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