HuaweiTech/warden — pull request #2 by tsjsdbd (2014-06-16 01:28:11+00:00)
Title: Container net reachable check should be more robust

"4.2.2.1" is an exact internet IP, it can not be reached if behind a http proxy environment, for "ping" packet will not use the http proxy. If container can reach the DEA's gateway, that also mean net out is OK.