排除与不使用边界网关协议的 Cisco IOS 客户网关设备的 AWS Site-to-Site VPN 连接故障

对 Cisco 客户网关设备的连接进行故障排除时，请考虑三件事：IKEIPsec、和隧道。您可以按任意顺序对这些区域进行故障排除，但我们建议您从IKE（网络堆栈底部）开始，然后向上移动。

IKE

使用以下命令。响应显示IKE配置正确的客户网关设备。


router# show crypto isakmp sa


IPv4 Crypto ISAKMP SA
dst             src             state          conn-id slot status
174.78.144.73 205.251.233.121 QM_IDLE           2001    0 ACTIVE
174.78.144.73 205.251.233.122 QM_IDLE           2002    0 ACTIVE

您应该可以看到包含隧道中所指定远程网关的 src 值的一行或多行。state 应为 QM_IDLE，status 应为 ACTIVE。缺少条目或任何处于其他状态的条目表示配置不IKE正确。

如需进一步排除故障，请运行下面的命令以启用可提供诊断信息的日志消息。


router# term mon
router# debug crypto isakmp

要禁用调试，请使用下面的命令。


router# no debug crypto isakmp

IPsec

使用以下命令。响应显示IPsec配置正确的客户网关设备。


router# show crypto ipsec sa


interface: Tunnel1
    Crypto map tag: Tunnel1-head-0, local addr 174.78.144.73

    protected vrf: (none)
    local  ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0)
    remote ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0)
    current_peer 72.21.209.225 port 500
     PERMIT, flags={origin_is_acl,}
     #pkts encaps: 149, #pkts encrypt: 149, #pkts digest: 149
     #pkts decaps: 146, #pkts decrypt: 146, #pkts verify: 146
     #pkts compressed: 0, #pkts decompressed: 0
     #pkts not compressed: 0, #pkts compr. failed: 0
     #pkts not decompressed: 0, #pkts decompress failed: 0
     #send errors 0, #recv errors 0

     local crypto endpt.: 174.78.144.73, remote crypto endpt.:205.251.233.121
     path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0
     current outbound spi: 0xB8357C22(3090512930)

     inbound esp sas:
      spi: 0x6ADB173(112046451)
       transform: esp-aes esp-sha-hmac ,
       in use settings ={Tunnel, }
       conn id: 1, flow_id: Motorola SEC 2.0:1, crypto map: Tunnel1-head-0
       sa timing: remaining key lifetime (k/sec): (4467148/3189)
       IV size: 16 bytes
       replay detection support: Y  replay window size: 128
       Status: ACTIVE

     inbound ah sas:

     inbound pcp sas:

     outbound esp sas:
      spi: 0xB8357C22(3090512930)
       transform: esp-aes esp-sha-hmac ,
       in use settings ={Tunnel, }
       conn id: 2, flow_id: Motorola SEC 2.0:2, crypto map: Tunnel1-head-0
       sa timing: remaining key lifetime (k/sec): (4467148/3189)
       IV size: 16 bytes
       replay detection support: Y  replay window size: 128
       Status: ACTIVE

     outbound ah sas:

     outbound pcp sas:

interface: Tunnel2
     Crypto map tag: Tunnel2-head-0, local addr 205.251.233.122

     protected vrf: (none)
     local  ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0)
     remote ident (addr/mask/prot/port): (0.0.0.0/0.0.0.0/0/0)
     current_peer 72.21.209.193 port 500
      PERMIT, flags={origin_is_acl,}
     #pkts encaps: 26, #pkts encrypt: 26, #pkts digest: 26
     #pkts decaps: 24, #pkts decrypt: 24, #pkts verify: 24
     #pkts compressed: 0, #pkts decompressed: 0
     #pkts not compressed: 0, #pkts compr. failed: 0
     #pkts not decompressed: 0, #pkts decompress failed: 0
     #send errors 0, #recv errors 0

     local crypto endpt.: 174.78.144.73, remote crypto endpt.:205.251.233.122
     path mtu 1500, ip mtu 1500, ip mtu idb FastEthernet0
     current outbound spi: 0xF59A3FF6(4120526838)

     inbound esp sas:
      spi: 0xB6720137(3060924727)
       transform: esp-aes esp-sha-hmac ,
       in use settings ={Tunnel, }
       conn id: 3, flow_id: Motorola SEC 2.0:3, crypto map: Tunnel2-head-0
       sa timing: remaining key lifetime (k/sec): (4387273/3492)
       IV size: 16 bytes
       replay detection support: Y  replay window size: 128
       Status: ACTIVE

     inbound ah sas:

     inbound pcp sas:

     outbound esp sas:
      spi: 0xF59A3FF6(4120526838)
       transform: esp-aes esp-sha-hmac ,
       in use settings ={Tunnel, }
       conn id: 4, flow_id: Motorola SEC 2.0:4, crypto map: Tunnel2-head-0
       sa timing: remaining key lifetime (k/sec): (4387273/3492)
       IV size: 16 bytes
       replay detection support: Y  replay window size: 128
       Status: ACTIVE

     outbound ah sas:

     outbound pcp sas:

对于每个隧道接口，您均应看到传入 esp sas 和传出 esp sas。这假设 SA 已列出（例如spi: 0x48B456A6），状态为ACTIVE，并且配置IPsec正确。

如需进一步排除故障，请使用下面的命令启用调试。


router# debug crypto ipsec

要禁用调试，请使用下面的命令。


router# no debug crypto ipsec

隧道

首先，检查必要的防火墙规则是否已布置到位。有关更多信息，请参阅 AWS Site-to-Site VPN 客户网关设备的防火墙规则。

如果您的防火墙规则设置正确，则请使用下面的命令继续排除故障。


router# show interfaces tun1


Tunnel1 is up, line protocol is up 
  Hardware is Tunnel
  Internet address is 169.254.249.18/30
  MTU 17867 bytes, BW 100 Kbit/sec, DLY 50000 usec, 
    reliability 255/255, txload 2/255, rxload 1/255
  Encapsulation TUNNEL, loopback not set
  Keepalive not set
  Tunnel source 174.78.144.73, destination 205.251.233.121
  Tunnel protocol/transport IPSEC/IP
  Tunnel TTL 255
  Tunnel transport MTU 1427 bytes
  Tunnel transmit bandwidth 8000 (kbps)
  Tunnel receive bandwidth 8000 (kbps)
  Tunnel protection via IPSec (profile "ipsec-vpn-92df3bfb-0")
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  5 minute input rate 0 bits/sec, 1 packets/sec
  5 minute output rate 1000 bits/sec, 1 packets/sec
    407 packets input, 30010 bytes, 0 no buffer
    Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

确保 line protocol 已运行。检查隧道源 IP 地址、源接口和目的地分别匹配客户网关设备外部 IP 地址、接口和虚拟私有网关外部 IP 地址的隧道配置。确保 Tunnel protection through IPSec 已存在。在两个隧道接口上运行命令。要解决任何问题，请查看配置并检查与客户网关设备的物理连接。

您也可以使用下面的命令，将 169.254.249.18 替换为您的虚拟专用网关的内部 IP 地址。


router# ping 169.254.249.18 df-bit size 1410


Type escape sequence to abort.
Sending 5, 1410-byte ICMP Echos to 169.254.249.18, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!

您应该可以看到五个感叹号。

路由

要查看您的静态路由表，请使用下面的命令。


router# sh ip route static


     1.0.0.0/8 is variably subnetted
S       10.0.0.0/16 is directly connected, Tunnel1
is directly connected, Tunnel2

您应该看到VPCCIDR通过两条隧道的静态路由都存在。如果它不存在，请添加静态路由，如下所示。


router# ip route 10.0.0.0 255.255.0.0 Tunnel1 track 100 
router# ip route 10.0.0.0 255.255.0.0 Tunnel2 track 200

检查显示SLA器


router# show ip sla statistics 100


IPSLAs Latest Operation Statistics

IPSLA operation id: 100
        Latest RTT: 128 milliseconds
Latest operation start time: *18:08:02.155 UTC Wed Jul  15 2012
Latest operation return code: OK
Number of successes: 3
Number of failures: 0
Operation time to live: Forever


router# show ip sla statistics 200


IPSLAs Latest Operation Statistics

IPSLA operation id: 200
        Latest RTT: 128 milliseconds
Latest operation start time: *18:08:02.155 UTC Wed Jul  15 2012
Latest operation return code: OK
Number of successes: 3
Number of failures: 0
Operation time to live: Forever

的值Number of successes表示SLA显示器是否已成功设置。

如需进一步排查问题，请核查配置。

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