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From Milind Parikh <>
Subject Re: IP address resolution in MultiDC setup (EC2)/VIP
Date Tue, 26 Apr 2011 17:56:12 GMT
At the risk of repeating the previous conclusions:

(a) This configuration obviates the need for a patch that I had posted
earlier. This is a good thing.
(b) The reported latency(@Sasha) is less than ordinary latencies in EC2. The
reasons behind this are not well understood. However I wouldn't look a gift
horse in the mouth.
(c) This configuration provides cloud provider independence for those
interested in such things; although YMMV in context of (b).
(d) This configuration can be run instead of the security configurations in
C0.8 for certain use-cases for secure communications.


On Tue, Apr 26, 2011 at 1:20 PM, Sasha Dolgy <> wrote:

> Ok, on each node, I have configured the listen address for cassandra
> as the VIP interface (tunXXX). This allows other cassandra instances
> to connect ONLY through the VPN network. The listen address is not
> configured for the eth0 interface (EC2).
> rpc_address is set to so that it can listen on all interfaces.
> if it's left blank, it will default to the value of the listen
> configuration ... which would
> mean all appserver -> cassandra traffic would be routed through the
> VPN connection (not what I want).
> When looking at netstat, I see the following on a node:
> tcp 0 0* LISTEN
> tcp 0 0* LISTEN
> 9160 allows clients to connect to the environment to GET/PUT data
> while the VPN interface is for node to node, secured, communication.
> As you see, I'm not referencing the EC2 IP anywhere in the
> configuration.  This allows me to leverage rackspace, amazon or any
> other services provider ... so long as my vpn tunnels are configured
> appropriate for each endpoint / environment.
> -sd
> On Tue, Apr 26, 2011 at 3:55 PM, pankaj soni <>
> wrote:
> > Hi,
> > I have a question regarding Vyatta or any providing VIP in general. While
> > routing through gateway do we bind it to ec2 nodes private IP or public
> IP?
> > Also, in general could you explain how VIP might help for I am new
> towards
> > this side of field.
> >
> > thanks

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