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this PR does / why we need it**:\r\n\r\nIncoming UDP packets not reach newly deployed services when old connection's state in conntrack is not cleared. When a packet arrives, it will not go through NAT table again, because it is not \"the first\" packet. The PR fix the issue\r\n\r\n**Which issue this PR fixes** \r\nFixes #31983\r\nxref https://github.com/docker/docker/issues/8795\r\n\r\n<!-- Reviewable:start -->\r\n\r\n---\r\n\r\nThis change is [<img src=\"https://reviewable.kubernetes.io/review_button.svg\" height=\"34\" align=\"absmiddle\" alt=\"Reviewable\"/>](https://reviewable.kubernetes.io/reviews/kubernetes/kubernetes/32561)\r\n\r\n<!-- Reviewable:end -->\r\n"},"comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/issues/comments/264334089","html_url":"https://github.com/kubernetes/kubernetes/pull/32561#issuecomment-264334089","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/32561","id":264334089,"user":{"login":"k8s-merge-robot","id":13653959,"avatar_url":"https://avatars.githubusercontent.com/u/13653959?v=3","gravatar_id":"","url":"https://api.github.com/users/k8s-merge-robot","html_url":"https://github.com/k8s-merge-robot","followers_url":"https://api.github.com/users/k8s-merge-robot/followers","following_url":"https://api.github.com/users/k8s-merge-robot/following{/other_user}","gists_url":"https://api.github.com/users/k8s-merge-robot/gists{/gist_id}","starred_url":"https://api.github.com/users/k8s-merge-robot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/k8s-merge-robot/subscriptions","organizations_url":"https://api.github.com/users/k8s-merge-robot/orgs","repos_url":"https://api.github.com/users/k8s-merge-robot/repos","events_url":"https://api.github.com/users/k8s-merge-robot/events{/privacy}","received_events_url":"https://api.github.com/users/k8s-merge-robot/received_events","type":"User","site_admin":false},"created_at":"2016-12-02T00:02:03Z","updated_at":"2016-12-02T00:02:03Z","body":"Automatic merge from submit-queue"}}
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