Okay I have played around with this even more and its just not going to work without fixing isc-dhcp itself. Here is an example configuration, where the gateway is set in one shared-network and not in the other. When the machine boots it gets the gateway from the other shared- network.
http://paste.ubuntu.com/15273844/ Now if you re-order the configuration and place the one without the gateway first it works as expected. But this will not work as the ordering can never correct as described in my previous comment. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu. https://bugs.launchpad.net/bugs/1521618 Title: wrong subnet in DHCP answer when multiple networks are present Status in MAAS: Triaged 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. To manage notifications about this bug go to: https://bugs.launchpad.net/maas/+bug/1521618/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
