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Re: [Rdo-list] Outbound packet traffic with nova-network

On 06/26/2013 11:58 PM, Michael Solberg wrote:
> Hi list.
> I'm having some trouble with my network setup and I thought maybe the
> group could help.  I have three compute nodes with two network
> interfaces.  There's a private network (fixed range) on
> eth1 and a network (floating range) on eth0 on these nodes.
> Networking works as expected.  Connectivity is good on the 192 network
> and traffic is forwarded from the floating range inbound to the fixed
> range correctly.  That is, I can ssh into an instance from the outside
> world using the floating address.  However, when traffic is leaving the
> instance, it doesn't seem to get translated.  Here's a concrete example:
> Instance has a fixed address of
> Instance is assigned a floating address of
> Instance is running on a hypervisor with the address
> Pings from the instance to return fine, but pings from the
> instance out to the internet don't work.  When I run a tcpdump, I see
> that the pings reach the destination with the source address set to
> [root 10 17 12 11 ~]# tcpdump -n -i eth0 icmp
> tcpdump: WARNING: eth0: no IPv4 address assigned
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
> 23:55:38.238739 IP > ICMP echo request, id
> 45321, seq 1, length 64
> 23:55:38.238774 IP > ICMP echo reply, id
> 45321, seq 1, length 64
> Is this expected?  If so, is there any way to get nova-network to
> translate the outbound traffic so that it looks like it's coming from
> instead of

Can you provide more information on your network topology?  What
nova-network mode are you using?

Your example is for "pings from the instance out to the internet", but
you're pinging an address ( that's on the same private
network as the compute node (  My guess is that is
confusing things.

Russell Bryant

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