This request is coming from [1].

The traffic from a nested router is not SNATed to the external network upper router. The environment is the following:

• Three networks. Two networks are tenant network (net1, net2), the third one is an external network (public).
• Two routers:
  • r2 (inner router) has two interfaces, one to "net1" and another one to "net2".
  • r1 (outer router) connected to "net1" and an external gw interface connected to "public"
• A vm connected to the inner network "net2"

A diagram of the deployment [2].

The following routes have been added:

• r1 (outer): destination=10.20.0.0/24,gateway=10.10.0.10 (destination: subnet "net2", gw: r2 net1 port)
• r2 (inner): destination=0.0.0.0/0,gateway=10.10.0.1 (destination: default route, gw: r1 net1 port)

The VM can ping to the external router GW port IP (10.218.0.221) but cannot ping to internet (cannot ping to 8.8.8.8, for example).

Attached in [3] are the following tables:

• logical router
• logical router port
• logical router static route
• nat

[1]https://bugs.launchpad.net/ubuntu/+source/neutron/+bug/2051935

[2]https://docs.google.com/presentation/d/1IR1XAb5dy3bsZsWKLome0blO9INyJ33D_6WXyA1O5GU/edit?usp=sharing

[3]https://paste.opendev.org/show/bwxuR55rW5UGr2wW1L1P/