Asus RT-N15U и L2TP: гадание по логам

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Купил (не для себя) роутер Asus RT-N15U. Пытаюсь подключиться с последней официальной прошивкой (2.1.1.1.78) к местному провайдеру по L2TP, а он следующее выдаёт в лог:

Jan  1 00:00:16 RT-N15U syslog.info syslogd started: BusyBox v1.7.2 
 Jan  1 00:00:16 RT-N15U user.notice igmp[1884]: igmp started!  
 Jan  1 00:00:19 RT-N15U user.emerg WAN Connection: WAN was exceptionally disconnected. 
 Jan  1 00:00:19 RT-N15U user.emerg wanduck: Enable QIS rule 
 Jan  1 00:00:19 RT-N15U user.emerg wanduck: Short udp_timeout 
 Jan  1 00:00:19 RT-N15U user.emerg USB storage: [rc] insmod usb-storage 
 Jan  1 00:00:20 RT-N15U user.notice igmp[1884]:  interface 172.16.0.1, DOWNSTREAM ver=0x16 name=br0 index=7  
 Jan  1 00:00:20 RT-N15U user.notice igmp[1884]:  interface 192.168.xxx.xxx, UPSTREAM ver=0x16 name=eth0 index=3  
 Jan  1 00:00:21 RT-N15U user.emerg wanduck: Enable QIS rule(SIGUSR2) 
 Jan  1 00:00:21 RT-N15U user.emerg wanduck: Short udp_timeout 
 Jan  1 00:00:21 RT-N15U daemon.info pppd[1953]: Plugin pppol2tp.so loaded. 
 Jan  1 00:00:21 RT-N15U daemon.notice pppd[1953]: pppd 2.4.2 started by admin, uid 0 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: using channel 1 
 Jan  1 00:00:21 RT-N15U daemon.info pppd[1953]: Using interface ppp0 
 Jan  1 00:00:21 RT-N15U daemon.notice pppd[1953]: Connect: ppp0 <-->  
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: PPPoL2TP options: debugmask 0 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: sent [LCP ConfReq id=0x1 <magic 0xd10f44a4>] 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: rcvd [LCP ConfReq id=0x1 <mru 1464> <auth chap MD5> <magic 0xdc45c0ab>] 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: sent [LCP ConfAck id=0x1 <mru 1464> <auth chap MD5> <magic 0xdc45c0ab>] 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: rcvd [LCP ConfAck id=0x1 <magic 0xd10f44a4>] 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: PPPoL2TP options: debugmask 0 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: sent [LCP EchoReq id=0x0 magic=0xd10f44a4] 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: rcvd [CHAP Challenge id=0x1 <db2a34ee0a237f4d3f4310428c0f18b7>, name = "ASR1006-fvpn"] 
 Jan  1 00:00:21 RT-N15U daemon.debug pppd[1953]: sent [CHAP Response id=0x1 <b0c72df743277cf8f84b15ac032bd5d4>, name = "blabla"] 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: rcvd [CHAP Success id=0x1 ""] 
 Jan  1 00:00:22 RT-N15U daemon.info pppd[1953]: CHAP authentication succeeded 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: sent [IPCP ConfReq id=0x1 <addr 0.0.0.0>] 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: rcvd [IPCP ConfReq id=0x1 <addr 172.16.0.1>] 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: sent [IPCP ConfAck id=0x1 <addr 172.16.0.1>] 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: rcvd [IPCP ConfNak id=0x1 <addr xxx.xxx.xxx.xxx>] 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: sent [IPCP ConfReq id=0x2 <addr xxx.xxx.xxx.xxx>] 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: rcvd [IPCP ConfAck id=0x2 <addr xxx.xxx.xxx.xxx>] 
 Jan  1 00:00:22 RT-N15U daemon.notice pppd[1953]: local  IP address xxx.xxx.xxx.xxx 
 Jan  1 00:00:22 RT-N15U daemon.notice pppd[1953]: remote IP address 172.16.0.1 
 Jan  1 00:00:22 RT-N15U daemon.debug pppd[1953]: Script /tmp/ppp/ip-up started (pid 1957) 
 Jan  1 00:00:22 RT-N15U user.emerg NTPCLIENT: host:[time.nist.gov ] 
 Jan  1 00:00:23 RT-N15U user.emerg WAN Connection: WAN was restored. 
 Jan  1 00:00:23 RT-N15U user.emerg wanduck: Disable QIS rule(D2C) 
 Jan  1 00:00:23 RT-N15U user.emerg wanduck: Restore udp_timeout 
 Jan  1 00:00:24 RT-N15U user.emerg L2TP: connect to ISP 
 Jan  1 00:00:24 RT-N15U daemon.debug pppd[1953]: Script /tmp/ppp/ip-up finished (pid 1957), status = 0x0 
 Jan  1 00:00:24 RT-N15U user.emerg LED: Turn off LED_USB 
 Jan  1 00:00:24 RT-N15U user.emerg LED: Turn off LED_WPS 
 Jan  1 00:00:24 RT-N15U user.emerg RC SYSTEM: IDLE 
 Jan  1 00:00:24 RT-N15U user.emerg RC SYSTEM: START other services 
 Jan  1 00:00:24 RT-N15U user.emerg RC NETWORK: load delayed_services 
 Jan  1 00:00:33 RT-N15U user.emerg RC RADIO: 2.4G RADIO OFF

И подключение не происходит. Можно догадаться, имея только эту информацию, в чём может быть проблема?

С xl2tpd на Ubuntu и другими роутерами, с которыми сталкивался, проблемы с подключением к данному провайдеру не наблюдал.