我在 Ubuntu 12.04 服务器（在 EC2 上）上按照以下步骤配置 openswan 和 xl2tpd各种各样的 教程/文档这些文章似乎都表达了同样的意思，但最近这个。
但是，我尝试从 Windows（我已使用共享密钥和用户名/密码配置）进行连接，但失败了。日志显示已建立 IPsec 隧道，但什么也没发生。
以下是数据包转储和日志活动（系统日志中没有发生任何内容，因此没有 iptables 日志消息）：
$ sudo tcpdump -n host 64.236.139.254 and not port 22
21:00:49.843198 IP 64.236.139.254.26712 > 10.252.60.213.500: isakmp: phase 1 I ident
21:00:49.844815 IP 10.252.60.213.500 > 64.236.139.254.26712: isakmp: phase 1 R ident
21:00:49.928882 IP 64.236.139.254.26712 > 10.252.60.213.500: isakmp: phase 1 I ident
21:00:49.930819 IP 10.252.60.213.500 > 64.236.139.254.26712: isakmp: phase 1 R ident
21:00:49.972728 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 1 I ident[E]
21:00:49.973924 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 1 R ident[E]
21:00:50.000353 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:50.001429 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
21:00:50.030932 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:50.037256 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:50.055200 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
21:00:50.415676 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:50.415731 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
21:00:50.416605 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R inf[E]
21:00:53.055631 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:53.060694 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
21:00:53.088162 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:53.088180 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
21:00:53.088437 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R inf[E]
21:00:57.069750 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:57.070741 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
21:00:57.101194 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:00:57.101390 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
21:00:57.101817 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R inf[E]
21:01:05.087873 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:01:05.089292 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
21:01:05.117423 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:01:05.117815 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
21:01:05.118026 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R inf[E]
21:01:09.122471 IP 10.252.60.213.4500 > 64.236.139.254.26724: isakmp-nat-keep-alive
21:01:09.122664 IP 10.252.60.213.4500 > 64.236.139.254.26724: isakmp-nat-keep-alive
21:01:09.301582 IP 64.236.139.254.26724 > 10.252.60.213.4500: isakmp-nat-keep-alive
21:01:15.180248 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:01:15.181699 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
21:01:15.288574 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
21:01:15.288612 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
21:01:15.289452 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R inf[E]
21:01:25.229928 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
21:01:25.230090 IP 64.236.139.254.26724 > 10.252.60.213.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
21:01:25.233650 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R inf[E]
21:01:25.251769 IP 10.252.60.213.4500 > 64.236.139.254.26724: NONESP-encap: isakmp: phase 2/others R inf[E]
$ tail -fn0 /var/log/syslog
Feb 6 21:00:30 ip-10-252-60-213 kernel: [11977313.441315] device eth0 entered promiscuous mode
$ tail -fn0 /var/log/auth.log
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: ignoring unknown Vendor ID payload [01528bbbc00696121849ab9a1c5b2a5100000001]
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: ignoring Vendor ID payload [MS NT5 ISAKMPOAKLEY 00000009]
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: received Vendor ID payload [RFC 3947] method set to=109
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n] meth=106, but already using method 109
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: ignoring Vendor ID payload [FRAGMENTATION]
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: ignoring Vendor ID payload [MS-Negotiation Discovery Capable]
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: ignoring Vendor ID payload [Vid-Initial-Contact]
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26712: ignoring Vendor ID payload [IKE CGA version 1]
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: responding to Main Mode from unknown peer 64.236.139.254
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: OAKLEY_GROUP 20 not supported. Attribute OAKLEY_GROUP_DESCRIPTION
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: OAKLEY_GROUP 19 not supported. Attribute OAKLEY_GROUP_DESCRIPTION
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: transition from state STATE_MAIN_R0 to state STATE_MAIN_R1
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: STATE_MAIN_R1: sent MR1, expecting MI2
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: NAT-Traversal: Result using RFC 3947 (NAT-Traversal): both are NATed
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: transition from state STATE_MAIN_R1 to state STATE_MAIN_R2
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: STATE_MAIN_R2: sent MR2, expecting MI3
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: Main mode peer ID is ID_IPV4_ADDR: '10.0.2.15'
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[15] 64.236.139.254 #50: switched from "L2TP-PSK-NAT" to "L2TP-PSK-NAT"
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: deleting connection "L2TP-PSK-NAT" instance with peer 64.236.139.254 {isakmp=#0/ipsec=#0}
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: transition from state STATE_MAIN_R2 to state STATE_MAIN_R3
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: new NAT mapping for #50, was 64.236.139.254:26712, now 64.236.139.254:26724
Feb 6 21:00:49 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: STATE_MAIN_R3: sent MR3, ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=aes_256 prf=oakley_sha group=modp2048}
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: the peer proposed: 54.245.182.129/32:17/1701 -> 10.0.2.15/32:17/0
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: NAT-Traversal: received 2 NAT-OA. using first, ignoring others
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #51: responding to Quick Mode proposal {msgid:01000000}
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #51: us: 10.252.60.213<10.252.60.213>[+S=C]:17/1701
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #51: them: 64.236.139.254[10.0.2.15,+S=C]:17/1701===10.0.2.15/32
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #51: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #51: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #51: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #51: STATE_QUICK_R2: IPsec SA established transport mode {ESP/NAT=>0xed4ff6b8 <0x9232de04 xfrm=AES_128-HMAC_SHA1 NATOA=10.0.2.15 NATD=64.236.139.254:26724 DPD=none}
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: the peer proposed: 54.245.182.129/32:17/1701 -> 10.0.2.15/32:17/1701
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: NAT-Traversal: received 2 NAT-OA. using first, ignoring others
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: responding to Quick Mode proposal {msgid:02000000}
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: us: 10.252.60.213<10.252.60.213>[+S=C]:17/1701
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: them: 64.236.139.254[10.0.2.15,+S=C]:17/1701===10.0.2.15/32
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: keeping refhim=4294901761 during rekey
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #52: STATE_QUICK_R2: IPsec SA established transport mode {ESP/NAT=>0xb245cb36 <0x76292945 xfrm=AES_128-HMAC_SHA1 NATOA=10.0.2.15 NATD=64.236.139.254:26724 DPD=none}
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received Delete SA(0xed4ff6b8) payload: deleting IPSEC State #51
Feb 6 21:00:50 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received and ignored informational message
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: the peer proposed: 54.245.182.129/32:17/1701 -> 10.0.2.15/32:17/1701
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: NAT-Traversal: received 2 NAT-OA. using first, ignoring others
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: responding to Quick Mode proposal {msgid:03000000}
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: us: 10.252.60.213<10.252.60.213>[+S=C]:17/1701
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: them: 64.236.139.254[10.0.2.15,+S=C]:17/1701===10.0.2.15/32
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: keeping refhim=4294901761 during rekey
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #53: STATE_QUICK_R2: IPsec SA established transport mode {ESP/NAT=>0xb6953c9c <0x3331cb4f xfrm=AES_128-HMAC_SHA1 NATOA=10.0.2.15 NATD=64.236.139.254:26724 DPD=none}
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received Delete SA(0xb245cb36) payload: deleting IPSEC State #52
Feb 6 21:00:53 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received and ignored informational message
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: the peer proposed: 54.245.182.129/32:17/1701 -> 10.0.2.15/32:17/1701
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: NAT-Traversal: received 2 NAT-OA. using first, ignoring others
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: responding to Quick Mode proposal {msgid:04000000}
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: us: 10.252.60.213<10.252.60.213>[+S=C]:17/1701
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: them: 64.236.139.254[10.0.2.15,+S=C]:17/1701===10.0.2.15/32
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: keeping refhim=4294901761 during rekey
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #54: STATE_QUICK_R2: IPsec SA established transport mode {ESP/NAT=>0x2ca92f36 <0x86256756 xfrm=AES_128-HMAC_SHA1 NATOA=10.0.2.15 NATD=64.236.139.254:26724 DPD=none}
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received Delete SA(0xb6953c9c) payload: deleting IPSEC State #53
Feb 6 21:00:57 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received and ignored informational message
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: the peer proposed: 54.245.182.129/32:17/1701 -> 10.0.2.15/32:17/1701
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: NAT-Traversal: received 2 NAT-OA. using first, ignoring others
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: responding to Quick Mode proposal {msgid:05000000}
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: us: 10.252.60.213<10.252.60.213>[+S=C]:17/1701
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: them: 64.236.139.254[10.0.2.15,+S=C]:17/1701===10.0.2.15/32
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: keeping refhim=4294901761 during rekey
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #55: STATE_QUICK_R2: IPsec SA established transport mode {ESP/NAT=>0x8df1a782 <0x61eed691 xfrm=AES_128-HMAC_SHA1 NATOA=10.0.2.15 NATD=64.236.139.254:26724 DPD=none}
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received Delete SA(0x2ca92f36) payload: deleting IPSEC State #54
Feb 6 21:01:05 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received and ignored informational message
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: the peer proposed: 54.245.182.129/32:17/1701 -> 10.0.2.15/32:17/1701
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: NAT-Traversal: received 2 NAT-OA. using first, ignoring others
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: responding to Quick Mode proposal {msgid:06000000}
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: us: 10.252.60.213<10.252.60.213>[+S=C]:17/1701
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: them: 64.236.139.254[10.0.2.15,+S=C]:17/1701===10.0.2.15/32
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: keeping refhim=4294901761 during rekey
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: transition from state STATE_QUICK_R0 to state STATE_QUICK_R1
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: STATE_QUICK_R1: sent QR1, inbound IPsec SA installed, expecting QI2
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: transition from state STATE_QUICK_R1 to state STATE_QUICK_R2
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #56: STATE_QUICK_R2: IPsec SA established transport mode {ESP/NAT=>0x021d5dde <0xc9c31f90 xfrm=AES_128-HMAC_SHA1 NATOA=10.0.2.15 NATD=64.236.139.254:26724 DPD=none}
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received Delete SA(0x8df1a782) payload: deleting IPSEC State #55
Feb 6 21:01:15 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received and ignored informational message
Feb 6 21:01:25 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received Delete SA(0x021d5dde) payload: deleting IPSEC State #56
Feb 6 21:01:25 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: ERROR: netlink XFRM_MSG_DELPOLICY response for flow eroute_connection delete included errno 2: No such file or directory
Feb 6 21:01:25 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received and ignored informational message
Feb 6 21:01:25 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254 #50: received Delete SA payload: deleting ISAKMP State #50
Feb 6 21:01:25 ip-10-252-60-213 pluto[1464]: "L2TP-PSK-NAT"[16] 64.236.139.254: deleting connection "L2TP-PSK-NAT" instance with peer 64.236.139.254 {isakmp=#0/ipsec=#0}
Feb 6 21:01:25 ip-10-252-60-213 pluto[1464]: packet from 64.236.139.254:26724: received and ignored informational message
此后似乎什么也没有发生，Windows 放弃了。
这是我在客户端看到的数据包 - 我看到完全相同的数据包，因此没有任何内容被过滤掉：
$ sudo tcpdump -i wlan3 -n host $ip and not port 22
12:59:16.170388 IP 10.66.230.208.53383 > 54.245.182.129.500: isakmp: phase 1 I ident
12:59:16.197972 IP 54.245.182.129.500 > 10.66.230.208.53383: isakmp: phase 1 R ident
12:59:16.255396 IP 10.66.230.208.53383 > 54.245.182.129.500: isakmp: phase 1 I ident
12:59:16.282917 IP 54.245.182.129.500 > 10.66.230.208.53383: isakmp: phase 1 R ident
12:59:16.299043 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 1 I ident[E]
12:59:16.326840 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 1 R ident[E]
12:59:16.328144 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:16.357804 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
12:59:16.358888 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:16.362385 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:16.741818 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
12:59:16.743117 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:16.743396 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
12:59:16.769431 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R inf[E]
12:59:19.383010 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:19.414362 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
12:59:19.415559 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
...
12:59:31.441952 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R oakley-quick[E]
12:59:31.443878 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:31.444124 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
12:59:31.476359 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R inf[E]
12:59:35.499825 IP 54.245.182.129.4500 > 10.66.230.208.53200: isakmp-nat-keep-alive
12:59:35.500068 IP 54.245.182.129.4500 > 10.66.230.208.53200: isakmp-nat-keep-alive
12:59:35.629175 IP 10.66.230.208.53200 > 54.245.182.129.4500: isakmp-nat-keep-alive
12:59:41.429705 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:41.534606 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R oakley-quick[E].537423 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I oakley-quick[E]
12:59:41.537675 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
12:59:41.642367 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R inf[E]
12:59:51.482628 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
12:59:51.482836 IP 10.66.230.208.53200 > 54.245.182.129.4500: NONESP-encap: isakmp: phase 2/others I inf[E]
12:59:51.587334 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R inf[E]
12:59:51.604347 IP 54.245.182.129.4500 > 10.66.230.208.53200: NONESP-encap: isakmp: phase 2/others R inf[E]
实际情况如下：
+ sudo ipsec verify
Checking your system to see if IPsec got installed and started correctly:
Version check and ipsec on-path [OK]
Linux Openswan U2.6.37/K3.2.0-37-virtual (netkey)
Checking for IPsec support in kernel [OK]
SAref kernel support [N/A]
NETKEY: Testing XFRM related proc values [OK]
[OK]
[OK]
Checking that pluto is running [OK]
Pluto listening for IKE on udp 500 [OK]
Pluto listening for NAT-T on udp 4500 [OK]
Checking for 'ip' command [OK]
Checking /bin/sh is not /bin/dash [WARNING]
Checking for 'iptables' command [OK]
Opportunistic Encryption Support [DISABLED]
+ ifconfig
eth0 Link encap:Ethernet HWaddr 22:00:0a:fc:3c:d5
inet addr:10.252.60.213 Bcast:10.252.60.255 Mask:255.255.255.192
inet6 addr: fe80::2000:aff:fefc:3cd5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4803 errors:0 dropped:0 overruns:0 frame:0
TX packets:3147 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:376849 (376.8 KB) TX bytes:628809 (628.8 KB)
Interrupt:25
eth0:0 Link encap:Ethernet HWaddr 22:00:0a:fc:3c:d5
inet addr:172.22.1.1 Bcast:172.22.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:25
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
+ sudo iptables -t nat -L
Chain PREROUTING (policy ACCEPT)
target prot opt source destination
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
MASQUERADE all -- anywhere anywhere
LOG all -- anywhere anywhere LOG level warning prefix "blah blah: "
+ sudo egrep -v '^[[:space:]]*(#|$)' /etc/ipsec.conf
version 2.0 # conforms to second version of ipsec.conf specification
config setup
dumpdir=/var/run/pluto/
nat_traversal=yes
virtual_private=%v4:172.16.0.0/12
oe=off
protostack=auto
conn L2TP-PSK-NAT
rightsubnet=vhost:%priv
also=L2TP-PSK-noNAT
conn L2TP-PSK-noNAT
authby=secret
pfs=no
auto=add
keyingtries=3
rekey=no
ikelifetime=8h
keylife=1h
type=transport
left=10.252.60.213
leftprotoport=17/1701
right=%any
rightprotoport=17/%any
forceencaps=yes
+ sudo cat /etc/ppp/options.xl2tpd
require-mschap-v2
ms-dns 8.8.8.8
ms-dns 8.8.4.4
asyncmap 0
auth
crtscts
lock
hide-password
modem
debug
name l2tpd
proxyarp
lcp-echo-interval 30
lcp-echo-failure 4
+ sudo cat /proc/sys/net/ipv4/ip_forward /proc/sys/net/ipv4/conf/*/{accept,send}_redirects
1
0
0
0
0
0
0
0
==> /proc/sys/net/ipv4/conf/lo/send_redirects <==
0
+ grep -v '^;' /etc/xl2tpd/xl2tpd.conf
[global]
ipsec saref = no
debug avp = yes
debug network = yes
debug packet = yes
debug state = yes
debug tunnel = yes
[lns default]
ip range = 172.22.1.2-172.22.1.99
local ip = 172.22.1.1
refuse chap = yes
refuse pap = yes
require authentication = yes
ppp debug = yes
pppoptfile = /etc/ppp/options.xl2tpd
length bit = yes
+ sudo cat /etc/ipsec.secrets
include /var/lib/openswan/ipsec.secrets.inc
10.252.60.213 %any: PSK "MYSHAREDSECRET"
+ sudo cat /etc/ppp/chap-secrets
# client server secret IP addresses
yang l2tpd MYPASSWORD *
答案1
嗯，那太糟糕了。
我在最后一个地方找到了解决方案：客户端。Windows 默认不支持 IPsec NAT-T，当服务器位于 NAT 后面时（如本例所示），就会使用 IPsec NAT-T。您必须添加注册表项才能启用此功能 - 请参阅http://support.microsoft.com/kb/926179/en-us（仍然适用于 Windows 8）。然后一切正常。
我如何找到它：这个帖子，而这是我通过 Google 搜索得到的第二个结果openswan ipsec STATE_QUICK_R2: IPsec SA established transport mode ESP/NAT。
答案2
在 ipsec.conf 中，left 不能是您的公共 IP，而是您的服务器看到的任何 IP，因此在本例中为 10.252.194.250。这样它就可以“匹配”左侧/右侧连接。其中 left=you，right=%any。
答案3
我也遇到了类似的问题。
我的服务器没有 NAT，所以不需要这部分，所以删除了它：
conn L2TP-PSK-NAT
rightsubnet=vhost:%priv
also=L2TP-PSK-noNAT
完成后，必须将 NAT Traversel 设置为是。
nat_traversal=yes