Github user dsclose commented on the issue:
https://github.com/apache/cloudstack/pull/1519
I'd recommend merging this if the tests are passing. There is an issue with
hairpin NATs which can be solved by adding a route to the guest subnet (scope
link) in each routing table. This is easy to do on Redundant routers (as routes
are handled in one spot in the transition to master) but needs a bit more work
on standalone routers - it looks like the guest subnet and device need to be
passed down from CsIP.process all the way to CsAddress.post_change_config.
Unfortunately I won't be available to do further work on this PR.
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