enable SSU2 and disable SSU by default

libi2pd/Config.cpp

@@ -64,7 +64,7 @@ namespace config {
 			("bandwidth", value<std::string>()->default_value(""),            "Transit traffic bandwidth limit: integer in KBps or letters: L (32), O (256), P (2048), X (>9000)")
 			("share", value<int>()->default_value(100),                       "Limit of transit traffic from max bandwidth in percents. (default: 100)")
 			("ntcp", bool_switch()->default_value(false),                     "Ignored. Always false")
-			("ssu", bool_switch()->default_value(true),                       "Enable SSU transport (default: enabled)")
+			("ssu", bool_switch()->default_value(false),                      "Enable SSU transport (default: disabled)")
 			("ntcpproxy", value<std::string>()->default_value(""),            "Ignored")
 #ifdef _WIN32
 			("svcctl", value<std::string>()->default_value(""),               "Ignored")
@@ -274,8 +274,8 @@ namespace config {
 
 		options_description ssu2("SSU2 Options");
 		ssu2.add_options()
-			("ssu2.enabled", value<bool>()->default_value(false),         "Enable SSU2 (default: disabled)")
-			("ssu2.published", value<bool>()->default_value(false),        "Publish SSU2 (default: disabled)")
+			("ssu2.enabled", value<bool>()->default_value(true),         "Enable SSU2 (default: enabled)")
+			("ssu2.published", value<bool>()->default_value(true),        "Publish SSU2 (default: enabled)")
 			("ssu2.port", value<uint16_t>()->default_value(0),            "Port to listen for incoming SSU2 packets (default: auto)")
 		;
 

libi2pd/Transports.cpp

@@ -1074,6 +1074,8 @@ namespace transport
 		bool ssu; i2p::config::GetOption("ssu", ssu);
 		if (!ssu) i2p::context.RemoveSSUAddress (); // TODO: remove later
 		bool ssu2; i2p::config::GetOption("ssu2.enabled", ssu2);
+		if (ssu2 && i2p::config::IsDefault ("ssu2.enabled") && !ipv4 && !ipv6)
+			ssu2 = false; // don't enable ssu2 for yggdrasil only router
 		if (ssu2)
 		{
 			uint16_t ssu2port; i2p::config::GetOption("ssu2.port", ssu2port);