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From "Daan Hoogland (JIRA)" <>
Subject [jira] [Reopened] (CLOUDSTACK-6485) [vpc] new private gateway network is registered wrong in network table
Date Sat, 10 May 2014 22:06:24 GMT


Daan Hoogland reopened CLOUDSTACK-6485:

The implemented solution causes regression in gateway creation. needs investigation. considering
revert of the change but the root cause is not clear yet.

> [vpc] new private gateway network is registered wrong in network table
> ----------------------------------------------------------------------
>                 Key: CLOUDSTACK-6485
>                 URL:
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Virtual Router
>    Affects Versions: 4.2.1, 4.3.0, 4.4.0, 4.3.1
>            Reporter: Anton Opgenoort
>            Assignee: Daan Hoogland
> When creating a private gateway for a VPC router on a network not yet known to Cloudstack,
Cloudstack ‘documents’ this network in the networks table.
> For normal guest networks, which should be associated with a single VPC, Cloudstack includes
the VPC_ID in the database. The VPC_ID field is used to provision all networks and nics on
a VPC router when it is created. Since this table is all about network provisioning it makes
sense to ‘document’ the network cidr and gateway present in that nework. For guest tiers
this usually is the VPC router itself, so the interface IP’s on a VPC router are the gateway
IP’s found in the networks table.
> Unfortunately the VPC_ID is also recorded for the private gateway network when it is
first created. So the first VPC to be plugged on the private gateway network also has that
same network associated as a guest network tier, instead of just a private gateway network.
> This by itself will not quickly become a problem, because private gateways are first
plugged on a running vpc router which is not likely to be recreated any time soon after that.
> But as soon as this first ever VPC router on the private gateway network is recreated
due to a destroy of the VPC Router, all associated networks are looked up in the networks
> Because the private gateway network is ‘documented’ with the actual upstream gateway
used by the VPC router defintion, the VPC router provisions a NIC on the private gateway network
using the IP address of the actual upstream gateway creating an IP conflict on the private
gateway network, effectively breaking down the upstream gateway functionality for all attached
private gateways of other vpc's.

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