由於 OpenVPN 是使用憑證的認証方式，所以必須先利用一部電腦(Windows 或 Linux)來產生主機與用戶端所需的不同憑證檔，以下將說明如何在 Linux 上產生這些憑證檔。
找一台 Linux，從官網下載 OpenVPN 安裝檔
http://openvpn.net/index.php/downloads.html
$wget http://openvpn.net/release/openvpn-2.0.9.tar.gz
$tar xzf openvpn-2.0.9.tar.gz
$cd openvpn-2.0.9/
$cd easy-rsa/
$vi vars
"}" expected: /content/body/p[3]/span, line 4, column 17 (click for details)MindTouch.Deki.Script.Compiler.DekiScriptParserException: "}" expected: /content/body/p[3]/span, line 4, column 17
at MindTouch.Deki.Script.Compiler.Errors.SynErr (System.String origin, Int32 line, Int32 col, Int32 n) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.SynErr (Int32 n) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.Expect (Int32 n) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.Map (MindTouch.Deki.Script.Expr.Location& location, MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.Primary (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.Unary (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.MulExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.AddExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.ConcatExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.RelExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.EqlExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.AndExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.OrExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.NullCoalescingExpr (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.TernaryExpression (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.Expression (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.Statements (MindTouch.Deki.Script.Expr.DekiScriptExpression& expr) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.DekiScript () [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.Parser.Parse () [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.DekiScriptParser.Parse (Location location, System.IO.Stream source) [0x00000] in <filename unknown>:0
at MindTouch.Deki.Script.Compiler.DekiScriptParser.Parse (System.Xml.XmlElement current, System.Collections.Generic.List`1 list) [0x00000] in <filename unknown>:0
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