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

Will Dennis wdennis at nec-labs.com
Fri May 6 20:07:31 UTC 2016


That’s in iptables, right? I have iptables disabled on my oVirt nodes...

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<mailto: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<mailto: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<mailto: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<mailto: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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