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--- a/libupnpp/upnpplib.cxx +++ b/libupnpp/upnpplib.cxx @@ -130,7 +130,8 @@ } // If the interface name was not specified, we possibly use the - // supplied IP address. + // supplied IP address. If this is empty too, libupnp will choose + // by itself (the first adapter). if (ifname.empty()) strncpy(ip_address, inip.c_str(), ipalen);