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[Zhao Yi <zhaoyi44@xxxxxxxxxxx>]

Public bug reported:

I found a small bug: ping the external network ip, clear external-
gateway and then set the external-gateway back, the ping connection is
not recoverd due to conntrack.

here is the detailed operations:
1. make sure a vm is connected to a router: "router1", and the router is connected to an external network.
2. ping the external network in a vm, it should be successful:
# ping 8.8.8.8
3. clear the external-gateway, now the ping connection is dropped.
# neutron router-gateway-clear router1
4. set the external-gateway back, "public" is an external network.
# neutron router-gateway-set router1 public

Now, I found the ping connection is not recovered, my investigation
shows this is due to conntrack state issue.

** Affects: neutron
     Importance: Undecided
     Assignee: Zhao Yi (zhaoyi44)
         Status: New


** Tags: l3

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https://bugs.launchpad.net/bugs/1488730

Title:
  ping the external network ip, clear external-gateway and then set the
  external-gateway back, the connection is not recoverd due to conntrack

Status in neutron:
  New

Bug description:
  I found a small bug: ping the external network ip, clear external-
  gateway and then set the external-gateway back, the ping connection is
  not recoverd due to conntrack.

  here is the detailed operations:
  1. make sure a vm is connected to a router: "router1", and the router is connected to an external network.
  2. ping the external network in a vm, it should be successful:
  # ping 8.8.8.8
  3. clear the external-gateway, now the ping connection is dropped.
  # neutron router-gateway-clear router1
  4. set the external-gateway back, "public" is an external network.
  # neutron router-gateway-set router1 public

  Now, I found the ping connection is not recovered, my investigation
  shows this is due to conntrack state issue.

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