# Adding a second external network using gre, second network does not route?

I was successful in creating an initial gre-based external network using the following guide "Per-tenant Routers with Private Networks": http://docs.openstack.org/trunk/openstack-network/admin/content/app_demo_routers_with_private_networks.html (http://docs.openstack.org/trunk/opens...) . However, when I create a second external network and attempt to add a second tenant network, router, vm, etc. It does not seem to route. Are there any special steps to add the second external network that isn't mentioned in the documentation?

Here are the steps I used to create everything on the second network:

# NOTE: the first external network was 192.168.1.0/24

quantum net-create EXTERNAL_NETWORK2 --provider:network_type local --router:external true quantum subnet-create EXTERNAL_NETWORK2 --gateway 192.168.2.1 192.168.2.0/24

# NOTE: the first tenant network was 172.16.1.0/24

quantum net-create TENANT_NET2 quantum subnet-create TENANT_NET2 172.16.2.0/24 nova boot --image \${image_id} --flavor 1 --nic net-id=<tenant_net2 id=""> TESTVM quantum router-create TENANT_ROUTER2 quantum router-interface-add TENANT_ROUTER2 <tenant_net2 subnet="" id=""> quantum router-gateway-set TENANT_ROUTER2 EXTERNAL_NETWORK2 quantum floatingip-create EXTERNAL_NETWORK2 quantum floatingip-associate <floating ip="" id=""> <vm port="" id="">

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multiple external networks are useful because it does not need operator to connect all of the related devices on one network. the operator can have one external network on AT&T device, another one on another vendor's.

Even if u have only one vendor, but with many external networks, u can divide quantum network nodes according to the way of their connection to that network. for example you can let each external network host a certain subnet...

the cost is to give gateway_external_network_id in l3_agent.ini file.

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I installed using the ubuntu cloud archive packages, which only seems to only provide one agent, at least out of the box. Would I need to launch a separate agent manually? Also, would I need to setup a separate bridge if br-ex is already used? If so, would I be able to attach that new bridge to the same interface?

Thanks!

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you can run multiple agents per node, assuming you are running with namespaces enabled.

On Tue, Mar 5, 2013 at 9:11 AM, digitalwonk < question223386@answers.launchpad.net > wrote:

Status: Answered => Open


digitalwonk is still having a problem: Thanks for the response Yong.

The l3 log currently report the following error message repeatedly:

2013-03-04 14:14:56 ERROR [quantum.agent.l3_agent] Error running l3_nat daemon_loop Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 171, in daemon_loop self.do_single_loop() File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 202, in do_single_loop target_ex_net_id = self._fetch_external_net_id() File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 185, in _fetch_external_net_id raise Exception("must configure 'gateway_external_network_id' if " Exception: must configure 'gateway_external_network_id' if Quantum has more than one external network.

So, if I have two separate external subnets, is there no way to have both of them being used on the same network node? Or would I need to somehow setup a separate quantum network node?

If I have to specify only one gateway_external_network_id, then why would anyone have more than external networks?

Thank you, Edwin

~~~~~~~~~~~~~~~~~~~~~~~~~~~ Dan Wendlandt Nicira, Inc: http://www.nicira.com twitter: danwendlandt ~~~~~~~~~~~~~~~~~~~~~~~~~~~

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Thanks for the response Yong.

The l3 log currently report the following error message repeatedly:

2013-03-04 14:14:56 ERROR [quantum.agent.l3_agent] Error running l3_nat daemon_loop Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 171, in daemon_loop self.do_single_loop() File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 202, in do_single_loop target_ex_net_id = self._fetch_external_net_id() File "/usr/lib/python2.7/dist-packages/quantum/agent/l3_agent.py", line 185, in _fetch_external_net_id raise Exception("must configure 'gateway_external_network_id' if " Exception: must configure 'gateway_external_network_id' if Quantum has more than one external network.

So, if I have two separate external subnets, is there no way to have both of them being used on the same network node? Or would I need to somehow setup a separate quantum network node?

If I have to specify only one gateway_external_network_id, then why would anyone have more than external networks?

Thank you, Edwin

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can u show me your log of l3 agent? If u have two external networks, you need to specify the external_network_id in l3_agent.ini.

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