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a60fb26
(Get the code!)
Rodolfo - I will post a reproducer, my devstack went sideways that I was testing on, but it clearly showed the issue. I only had to add a single route on the external gateway router, and a default route on the nested router going to the internal interface of that router.
Cascading routers like this is perfectly normal, and something customers do today. And everything works fine if you attach a floating IP, it's only default SNAT that is broken.
The other thing to note is that this works fine with ML2/OVS, as the router with the external gateway will SNAT everything that arrives on its internal interface, irregardless of the source IP. OVN changes this by only programming these SNAT rules for subnets directly attached to the router. I didn't feel like programming a SNAT rule for 0.0.0.0/0 was a good idea, which is why I proposed the patch.