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From Geoff Higginbottom <>
Subject RE: Configuring static routes on VM
Date Wed, 06 Feb 2013 00:41:36 GMT
Hi Jeff,

If I have interpreted your requirements correctly, you want to send traffic from the Guest
Instances to a network which is probably within the Data Centre and not on the internet. 
The Default Gateway for the Guest VMs is the VPC Virtual Router, and the Gateway used by the
VPC Virtual Router, is the Public Network Gateway.

If you want to direct traffic destined for a particular CIDR, you can configure the VPC Virtual
Router to route the traffic via a different Gateway by using the 'Private Gateway' feature.

Imagine you have a set of physical servers running in the same DC, create a VPC Private Gateway,
and then create the Routing Rules for the required CIDR, specifying the alternate Gateway
IP which has L3 connectivity to the physical servers.  This will add a new Virtual Interface
onto the VPC Virtual Router, and create the routes so traffic is sent via the alternate Gateway
rather than the Public Network Gateway.  You will obviously need to update the routing rules
on alternate gateway so the traffic can flow back to the Guest VMs.


Geoff Higginbottom

D: +44 20 3603 0542 | S: +44 20 3603 0540 | M: +447968161581

-----Original Message-----
From: Chip Childers []
Sent: 05 February 2013 19:12
Subject: Re: Configuring static routes on VM

On Tue, Feb 05, 2013 at 10:47:15AM -0800, Chiradeep Vittal wrote:
> We could enhance the CloudStack API to support DHCP options per subnet.
> One DHCP option could be static routes.

+1 to that...  Jeff, want to open a feature request [1] for this?



> On 2/5/13 10:06 AM, "Chris Sears" <> wrote:
> >Hi Jeff,
> >
> >CloudStack currently does all in-guest network configuration via DHCP
> >and, as far as I can tell, no DHCP options are being set that would
> >push static routes.
> >
> >If you have a VM with multiple NICs, the DHCP server will hand out
> >IPs to each of them, while trying not to confuse the guest about the
> >default gateway. In an earlier discussion, it was mentioned that this
> >can be challenging due to differences in DHCP client of each guest OS:
> >
> >
> > - Chris
> >
> >On Tue, Feb 5, 2013 at 9:29 AM, Chip Childers
> ><>
> >wrote:
> >> On Mon, Feb 4, 2013 at 2:59 PM, Jeffrey McGovern
> >> <> wrote:
> >>> Hello,
> >>> I was wondering if there is a way to configure static routes on a
> >>>guest VM  after it has been provisioned via Cloudstack?
> >>
> >> Jeff,
> >>
> >> It may help if you provide a little more context to the question to
> >> help folks understand what you're looking to do.
> >>
> >> -chip
> >>

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