Hi,

If you are creating isolated network with your /27 cidr and deploying vm in 
that , default gateway on the vm will always points to ip address configured on 
the virtual routers guest interface. So for the vms to point to the gateway in 
/27 cidr, create a shared network and deploy vm in that.

Thanks,
Sanjeev

-----Original Message-----
From: Bryan Manske [mailto:br...@manske.org] 
Sent: Friday, October 18, 2013 1:20 AM
To: users@cloudstack.apache.org
Subject: Public IPs on Guest VMs within CloudStack 4.2.0

All,

Now I'm curious about public IPs on Guest VMs within CloudStack 4.2.0.

I have one IPv4 /27 for Public IPs and that's working fine.  Now what I want to 
do is assign a live IP address from another /27 to a Guest VM, which appears to 
work but can't actually touch the default gateway.

So here's the rub: The default gateway is actually provided as a virtual IP on 
two VRRP nodes (for A/B redundancy) by my upstream provider.  I can ping the 
two VRRP routers, I can see the VM has the proper IP address, netmask, and 
default gateway; and I can configure the VM with a proper IP config which never 
finds the default gateway IP.  The arp cache sees the local MAC address and 
incomplete for the gateway.

So now I'm thinking; according to cloudstack, is the default gateway plumbed on 
a virtual router?  If so, how does THAT route out to the world?

I also have a /64 of IPv6 space, /96 of which I have configured in a network 
offering which has the same upstream infrastructure situation.  Same lack of 
functionality there.

So how do I configure my Guest real IP netblocks?  Is it okay to be looking for 
a default gateway IP on a my provider's core router or do I need to have them 
statically route that netblock to something like the cloudstack management host?

Of course I could also have the network offering wrong or incomplete.

Any thoughts or pointers to documentation would be appreciated.

I can tell I'm making progress because I keep dealing with progressively higher 
level errors. :)

Thanks.

Bryan Manske


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