I tried to setup a vpn channel with L2TP, but no chance.
See log:
2007:11:14-15:31:43 (none) l2tpd[26895]: Linux version 2.6.16.43-54-default on a i686, listening on IP address 0.0.0.0, port 1701
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: received Vendor ID payload [RFC 3947]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [4df37928e9fc4fd1b3262170d515c662]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [8f8d83826d246b6fc7a8a6a428c11de8]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [439b59f8ba676c4c7737ae22eab8f582]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [4d1e0e136deafa34c4f3ea9f02ec7285]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [80d0bb3def54565ee84645d4c85ce3ee]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [9909b64eed937c6573de52ace952fa6b]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [draft-ietf-ipsec-nat-t-ike-03]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: ignoring Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n]
2007:11:14-15:34:27 (none) pluto[14293]: packet from XX.XX.XX.XX:25: received Vendor ID payload [Dead Peer Detection]
2007:11:14-15:34:27 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: responding to Main Mode from unknown peer XX.XX.XX.XX:25
2007:11:14-15:34:27 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: multiple ipsec.secrets entries with distinct secrets match endpoints: first secret used
2007:11:14-15:34:28 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: NAT-Traversal: Result using RFC 3947: peer is NATed
2007:11:14-15:34:28 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: multiple ipsec.secrets entries with distinct secrets match endpoints: first secret used
2007:11:14-15:34:28 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:28 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:28 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:32 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:32 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:32 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:34 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:34 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:34 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:38 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:38 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:38 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:40 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:40 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:40 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:44 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:44 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:44 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:47 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:47 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:47 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:50 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:50 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:50 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:52 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:52 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:52 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:55 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:55 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:55 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
2007:11:14-15:34:59 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: byte 2 of ISAKMP Identification Payload must be zero, but is not
2007:11:14-15:34:59 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: probable authentication failure (mismatch of preshared secrets?): malformed payload in packet
2007:11:14-15:34:59 (none) pluto[14293]: "D_REF_pKxgrUttBe_1"[1] XX.XX.XX.XX:25 #408: sending encrypted notification PAYLOAD_MALFORMED to XX.XX.XX.XX:25
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