I... think that might be a VPN tunnel option.

config/tunconf.go

@@ -58,6 +58,7 @@ type Conf struct {
 	AccessList                []string
 	MessageReliability        string
 	exists                    bool
+	VPN                       bool
 }
 
 // Print returns and prints a formatted list of configured tunnel settings.

config/type.go

@@ -1,6 +1,9 @@
 package i2ptunconf
 
-import "strings"
+import (
+	"fmt"
+	"strings"
+)
 
 // GetType takes an argument and a default. If the argument differs from the
 // default, the argument is always returned. If the argument and default are
@@ -39,6 +42,9 @@ func (c *Conf) SetType(label ...string) {
 		if strings.Contains(v, "client") {
 			c.Client = true
 		}
+		if strings.Contains(v, "vpn") {
+			c.VPN = true
+		}
 		if c.Type == "server" || c.Type == "http" || c.Type == "client" || c.Type == "udpserver" || c.Type == "udpclient" {
 			c.Type = v
 		}
@@ -46,3 +52,10 @@ func (c *Conf) SetType(label ...string) {
 		c.Type = "server"
 	}
 }
+
+func (c *Conf) VPNServerMode() (bool, error) {
+	if c.VPN == true {
+		return !c.Client, nil
+	}
+	return false, fmt.Errorf("VPN mode not detected.")
+}