[Bug 1521618] Re: wrong subnet in DHCP answer when multiple networks are present

[Blake Rouse]

** Changed in: maas
       Status: Triaged => In Progress

** Also affects: maas/1.9
   Importance: Undecided
       Status: New

** Changed in: maas/1.9
       Status: New => In Progress

** Changed in: maas/1.9
    Milestone: None => 1.9.3

** Changed in: maas/1.9
   Importance: Undecided => High

** Changed in: maas
   Importance: Critical => High

** Changed in: maas
     Assignee: (unassigned) => Blake Rouse (blake-rouse)

** Changed in: maas/1.9
     Assignee: (unassigned) => Trent Lloyd (lathiat)

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Title:
  wrong subnet in DHCP answer when multiple networks are present

Status in MAAS:
  In Progress
Status in MAAS 1.9 series:
  In Progress
Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  So I have 3 interfaces with 3, non-overlapping subnets defined in my
  maas cluster controller.

  The idea would be that there is a provisioning network (10.6.0.0/16)
  to do the actual provisioning and once the node gets deployed it is
  using a different network (because the provisioning network is only
  1x1Gbit while the production network is bonded (LACP) 10Gbit).

  However, when I boot up a fresh, new node to add to MAAS, it gets the
  following DHCP reply:

  ip=10.6.239.3:10.6.250.250:9.4.113.254:255.255.255.0

  So instead of picking up the /16 subnet correctly for the 10.6.239.3
  IP, it picks up the /24 from the network where it gets it's default
  gateway from.

  Is this a bug or my understanding of how MAAS should behave when there
  are multiple networks flawed?

  Here is my /var/lib/maas/dhcpd.conf:

  subnet 9.4.113.0 netmask 255.255.255.0 {
         if option arch = 00:0E {
            filename "pxelinux.0";
            option path-prefix "ppc64el/";
         } elsif option arch = 00:07 {
            filename "bootx64.efi";
         } elsif option arch = 00:0B {
            filename "grubaa64.efi";
         } elsif option arch = 00:0C {
            filename "bootppc64.bin";
         } else {
            filename "pxelinux.0";
         }
         interface "eth0";
         ignore-client-uids true;
         option subnet-mask 255.255.255.0;
         option broadcast-address 9.4.113.255;
         option domain-name-servers 9.4.113.251;
         option domain-name "i.zc2.ibm.com";
         option routers 9.4.113.254;
         option ntp-servers ntp.ubuntu.com;
         range dynamic-bootp 9.4.113.150 9.4.113.190;
         class "PXE" {
            match if substring (option vendor-class-identifier, 0, 3) = "PXE";
            default-lease-time 30;
            max-lease-time 30;
         }
  }
  subnet 10.6.0.0 netmask 255.255.0.0 {
         if option arch = 00:0E {
            filename "pxelinux.0";
            option path-prefix "ppc64el/";
         } elsif option arch = 00:07 {
            filename "bootx64.efi";
         } elsif option arch = 00:0B {
            filename "grubaa64.efi";
         } elsif option arch = 00:0C {
            filename "bootppc64.bin";
         } else {
            filename "pxelinux.0";
         }
         interface "eth1";
         ignore-client-uids true;
         option subnet-mask 255.255.0.0;
         option broadcast-address 10.6.255.255;
         option domain-name-servers 9.4.113.251;
         option domain-name "i.zc2.ibm.com";
         option ntp-servers ntp.ubuntu.com;
         range dynamic-bootp 10.6.239.0 10.6.239.239;
         class "PXE" {
            match if substring (option vendor-class-identifier, 0, 3) = "PXE";
            default-lease-time 30;
            max-lease-time 30;
         }
  }

  Here is "subnets read":

  [
      {
          "dns_servers": [],
          "name": "9.4.113.0/24",
          "space": "space-0",
          "vlan": {
              "name": "untagged",
              "resource_uri": "/MAAS/api/1.0/vlans/0/",
              "fabric": "fabric-0",
              "vid": 0,
              "id": 0
          },
          "gateway_ip": "9.4.113.254",
          "cidr": "9.4.113.0/24",
          "id": 1,
          "resource_uri": "/MAAS/api/1.0/subnets/1/"
      },
      {
          "dns_servers": [],
          "name": "10.7.0.0/16",
          "space": "space-0",
          "vlan": {
              "name": "untagged",
              "resource_uri": "/MAAS/api/1.0/vlans/5001/",
              "fabric": "fabric-1",
              "vid": 0,
              "id": 5001
          },
          "gateway_ip": null,
          "cidr": "10.7.0.0/16",
          "id": 2,
          "resource_uri": "/MAAS/api/1.0/subnets/2/"
      },
      {
          "dns_servers": [],
          "name": "10.6.0.0/16",
          "space": "space-0",
          "vlan": {
              "name": "untagged",
              "resource_uri": "/MAAS/api/1.0/vlans/5002/",
              "fabric": "fabric-2",
              "vid": 0,
              "id": 5002
          },
          "gateway_ip": null,
          "cidr": "10.6.0.0/16",
          "id": 3,
          "resource_uri": "/MAAS/api/1.0/subnets/3/"
      }
  ]

  Running 1.9.0~rc2+bzr4509-0ubuntu1~trusty1.

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