udpxy отправляет 500 ошибку

[rewuxiin]

впервые пробую пробросить multicast траффик
udpxy - установил, запустил, пытаюсь из виртуальной машины открыть vlc url - ошибка
читаю лог udpxy

Код: [Выделить]

2015-08-29 12:04:06.275955 MSK S(3078) acting on accepted socket [8] (1/1)
2015-08-29 12:04:06.275980 MSK S(3078) Reading command from socket [8]
2015-08-29 12:04:06.276015 MSK S(3078) HTTP buffer [64 bytes] received
GET /udp/195.162.90.74:4000 HTTP/1.0
Host: 192.168.1.100:8011
2015-08-29 12:04:06.276078 MSK S(3078) Request=[udp/195.162.90.74:4000], length=[22]
2015-08-29 12:04:06.276103 MSK S(3078) Command [udp] with params [195.162.90.74:4000] read from socket=[8]
2015-08-29 12:04:06.276127 MSK S(3078) udp_relay : new_socket=[8] param=[195.162.90.74:4000]
2015-08-29 12:04:06.276305 MSK S(3078) Added client: pid=[4039], maddr=[195.162.90.74], mport=[4000], saddr=[192.168.1.110], sport=[1422]
2015-08-29 12:04:06.276298 MSK S(3078) Client process=[4039] started for socket=[8]
2015-08-29 12:04:06.276348 MSK S(3078) process_requests: closing accepted socket [8]
2015-08-29 12:04:06.276358 MSK c(4039) min socket buffer = [65536], max space to use = [1500], Rmsgs = [1]
2015-08-29 12:04:06.276380 MSK c(4039) Setting up multicast listener
2015-08-29 12:04:06.276382 MSK S(3078) Processed [1/1] accepted sockets
newly-accepted sockets [1]: -1
2015-08-29 12:04:06.276408 MSK c(4039) current receive buffer size is [212992] bytes for socket [5]
2015-08-29 12:04:06.276421 MSK S(3078) All accepted sockets processed
2015-08-29 12:04:06.276440 MSK S(3078) Waiting for input from [2] fd's, NO timeout
2015-08-29 12:04:06.276455 MSK c(4039) setup_mcast_listener: bind: Cannot assign requested address
2015-08-29 12:04:06.276485 MSK c(4039) Sent HTTP response code=[500], reason=[Service error] to socket=[8]
HTTP/1.1 500 Service error
Server: udpxy 1.0-23.0 (prod) standard [Linux 3.16.0-46-generic x86_64]
Content-Type:application/octet-stream
первый вопрос - необходим ли второй сетевой интерфейс для проброса или же здесь идет просто преобразование и я могу работать с одной сетевой картой?

второй вопрос(если первый не дает уже на него ответ) - че ж за ошибка такая?