xuxian issues

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                                            xuxian

被加速主机NAT变成了PortRestrictedCone类型。。

Please create a separate PR for this issue. _Originally posted by @sergiud in https://github.com/google/glog/pull/631#discussion_r605574502_

make a new PR for https://github.com/google/glog/issues/633#issue-848901031

cla: yes