I setup the my debian pc as cleint to my l2tp server and when run the command:
ipsec auto --up mypc

ERROR: "mypc" #1: sendto on ppp0 to 217.111.94.149:500 failed in STATE_MAIN_I2. Errno 105: No buffer space available
"mypc" #1: STATE_MAIN_I3: sent MI3, expecting MR3
"mypc" #1: discarding duplicate packet; already STATE_MAIN_I3
"mypc" #1: Main mode peer ID is ID_IPV4_ADDR: '217.111.94.149'
"mypc" #1: transition from state STATE_MAIN_I3 to state STATE_MAIN_I4
"mypc" #1: STATE_MAIN_I4: ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=aes_128 prf=oakley_sha group=modp2048}
"mypc" #2: initiating Quick Mode PSK+ENCRYPT+DONTREKEY+UP+IKEv2ALLOW+SAREFTRACK {using isakmp#1 msgid:03e2c4a2 proposal=defaults pfsgroup=no-pfs}
"mypc" #2: transition from state STATE_QUICK_I1 to state STATE_QUICK_I2
ERROR: "mypc" #2: sendto on ppp0 to 217.111.94.149:500 failed in STATE_QUICK_I1. Errno 105: No buffer space available
"mypc" #2: STATE_QUICK_I2: sent QI2, IPsec SA established transport mode {ESP=>0xc1c38349 <0x3905a985 xfrm=AES_128-HMAC_SHA1 NATOA=none NATD=none DPD=none}
"mypc" #2: retransmitting in response to duplicate packet; already STATE_QUICK_I2
The log above show that connection is estableshed with my l2tp server, but i didn't see any changes, is there any further steps to do or how i can use now this l2tp tunnel?