总部与分支机构建立IPSEC VPN
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问题描述：
现IPSEC VPN安全数据流已建立完成，IPSEC 的隧道也可以正常使用；安全上的策略已全部放行，
现阶段源地址为172.20.0.240，可以正常访问172.16.1.1/24 192.168.6.0/24,网段，
但是源地址为172.16.1.1/24 、192.168.6.0/24 访问172.20.0.200，及下行地址均无法ping通过，这个是什么原因？有大神了解吗 ？
组网及组网描述：
- 2019-11-20提问
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最佳答案
看下感兴趣流的配置
ACL配置是否拒绝掉
两端有无去对端的路由
debug&抓包
- 2019-11-20回答
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-本部：------------------------------ Interface: GigabitEthernet1/0/15 ------------------------------- ----------------------------- IPsec policy: peer1 Sequence number: 10 Mode: ISAKMP ----------------------------- Tunnel id: 1 Encapsulation mode: tunnel Perfect Forward Secrecy: Inside VPN: Extended Sequence Numbers enable: N Traffic Flow Confidentiality enable: N Path MTU: 1444 Tunnel: local address: 60.174.195.3 remote address: 60.168.150.192 Flow: sour addr: 172.20.0.0/255.255.255.0 port: 0 protocol: ip dest addr: 172.16.1.0/255.255.255.0 port: 0 protocol: ip [Inbound ESP SAs] SPI: 227384064 (0x0d8d9b00) Connection ID: 133143986184 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/921 Max received sequence-number: 0 Anti-replay check enable: Y Anti-replay window size: 64 UDP encapsulation used for NAT traversal: N Status: Active [Outbound ESP SAs] SPI: 1073550679 (0x3ffd1557) Connection ID: 150323855369 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/921 Max sent sequence-number: 0 UDP encapsulation used for NAT traversal: N Status: Active ----------------------------- IPsec policy: peer1 Sequence number: 10 Mode: ISAKMP ----------------------------- Tunnel id: 0 Encapsulation mode: tunnel Perfect Forward Secrecy: Inside VPN: Extended Sequence Numbers enable: N Traffic Flow Confidentiality enable: N Path MTU: 1444 Tunnel: local address: 60.174.195.3 remote address: 60.168.150.192 Flow: sour addr: 172.20.0.0/255.255.255.0 port: 0 protocol: ip dest addr: 192.168.6.0/255.255.255.0 port: 0 protocol: ip [Inbound ESP SAs] SPI: 3893830416 (0xe8172310) Connection ID: 81604378634 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/1182 Max received sequence-number: 0 Anti-replay check enable: Y Anti-replay window size: 64 UDP encapsulation used for NAT traversal: N Status: Active [Outbound ESP SAs] SPI: 431071358 (0x19b1a07e) Connection ID: 81604378635 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/1182 Max sent sequence-number: 0 UDP encapsulation used for NAT traversal: N Status: Active 分支：------------------------------- Interface: GigabitEthernet1/0/1 ------------------------------- ----------------------------- IPsec policy: peer2 Sequence number: 10 Mode: ISAKMP ----------------------------- Tunnel id: 1 Encapsulation mode: tunnel Perfect Forward Secrecy: Inside VPN: Extended Sequence Numbers enable: N Traffic Flow Confidentiality enable: N Path MTU: 1444 Tunnel: local address: 60.168.150.192 remote address: 60.174.195.3 Flow: sour addr: 172.16.1.0/255.255.255.0 port: 0 protocol: ip dest addr: 172.20.0.0/255.255.255.0 port: 0 protocol: ip [Inbound ESP SAs] SPI: 1073550679 (0x3ffd1557) Connection ID: 133143986184 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/911 Max received sequence-number: 0 Anti-replay check enable: Y Anti-replay window size: 64 UDP encapsulation used for NAT traversal: N Status: Active [Outbound ESP SAs] SPI: 227384064 (0x0d8d9b00) Connection ID: 133143986185 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/911 Max sent sequence-number: 0 UDP encapsulation used for NAT traversal: N Status: Active ----------------------------- IPsec policy: peer2 Sequence number: 10 Mode: ISAKMP ----------------------------- Tunnel id: 0 Encapsulation mode: tunnel Perfect Forward Secrecy: Inside VPN: Extended Sequence Numbers enable: N Traffic Flow Confidentiality enable: N Path MTU: 1444 Tunnel: local address: 60.168.150.192 remote address: 60.174.195.3 Flow: sour addr: 192.168.6.0/255.255.255.0 port: 0 protocol: ip dest addr: 172.20.0.0/255.255.255.0 port: 0 protocol: ip [Inbound ESP SAs] SPI: 431071358 (0x19b1a07e) Connection ID: 81604378634 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/1171 Max received sequence-number: 0 Anti-replay check enable: Y Anti-replay window size: 64 UDP encapsulation used for NAT traversal: N Status: Active [Outbound ESP SAs] SPI: 3893830416 (0xe8172310) Connection ID: 81604378635 Transform set: ESP-ENCRYPT-3DES-CBC ESP-AUTH-MD5 SA duration (kilobytes/sec): 1843200/3600 SA remaining duration (kilobytes/sec): 1843200/1171 Max sent sequence-number: 0 UDP encapsulation used for NAT traversal: N Status: Active 路由都是正常的，
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内网口，下行接口修改MTU值吗 ？改成1400 吗？
内网接口修改MTU值，之后还是值172.20.0.200 地址不能访问，