一 组网拓扑两端终端实现内网互通通过ipv4 over ipv4隧道实现二 设备配置2.1 R1设备配置sysname R1#ip unreachables enableip ttl-expires enable#lldp global enable#acl advanced 3000description NATrule 100 permit ip#interface GigabitEthernet0/0port link-mode routecombo enable copperip address 192.168.1.1 255.255.255.0#interface GigabitEthernet0/1port link-mode routecombo enable copperip address 202.1.1.2 255.255.255.0nat outbound 3000#interface Tunnel1 mode ipv4-ipv4ip address 2.2.2.1 255.255.255.252source 202.1.1.2destination 203.1.1.2keepalive 10 3#ip route-static 0.0.0.0 0 202.1.1.1ip route-static 192.168.2.0 24 Tunnel1#2.2 R2设备配置sysname R2#ip unreachables enableip ttl-expires enable#lldp global enable#acl advanced 3000description NATrule 100 permit ip#interface GigabitEthernet0/0port link-mode routedescription NATcombo enable copperip address 203.1.1.2 255.255.255.0nat outbound 3000#interface GigabitEthernet0/1port link-mode routecombo enable copperip address 192.168.2.1 255.255.255.0#interface Tunnel1 mode ipv4-ipv4ip address 2.2.2.2 255.255.255.252source 203.1.1.2destination 202.1.1.2keepalive 10 3#ip route-static 0.0.0.0 0 203.1.1.1ip route-static 192.168.1.0 24 Tunnel1#2.3 ISP设备配置sysname ISP#ip unreachables enableip ttl-expires enable#lldp global enable#interface LoopBack0ip address 8.8.8.8 255.255.255.255#interface GigabitEthernet0/0port link-mode routecombo enable copperip address 202.1.1.1 255.255.255.0#interface GigabitEthernet0/1port link-mode routecombo enable copperip address 203.1.1.1 255.255.255.0#2.4 PC1设备配置sysname PC1#ip unreachables enableip ttl-expires enable#lldp global enable#interface GigabitEthernet0/0port link-mode routecombo enable copperip address 192.168.1.2 255.255.255.0#ip route-static 0.0.0.0 0 192.168.1.1#2.5 PC2设备配置sysname PC2#ip unreachables enableip ttl-expires enable#lldp global enable#interface GigabitEthernet0/0port link-mode routecombo enable copperip address 192.168.3.2 255.255.255.0#ip route-static 0.0.0.0 0 192.16821.1#三 业务测试和IPV4 Over IPV4抓包3.1 PC1业务测试PC1ping 192.168.2.2Ping 192.168.2.2 (192.168.2.2): 56 data bytes, press CTRLC to break56 bytes from 192.168.2.2: icmp_seq0 ttl253 time1.263 ms56 bytes from 192.168.2.2: icmp_seq1 ttl253 time1.942 ms56 bytes from 192.168.2.2: icmp_seq2 ttl253 time1.464 ms56 bytes from 192.168.2.2: icmp_seq3 ttl253 time1.152 ms56 bytes from 192.168.2.2: icmp_seq4 ttl253 time1.062 ms--- Ping statistics for 192.168.2.2 ---5 packet(s) transmitted, 5 packet(s) received, 0.0% packet lossround-trip min/avg/max/std-dev 1.062/1.377/1.942/0.313 msPC1%Aug 10 10:40:17:142 2026 PC1 PING/6/PING_STATISTICS: Ping statistics for 192.168.2.2: 5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss, round-trip min/avg/max/std-dev 1.062/1.377/1.942/0.313 ms.PC1tracert 192.168.2.2traceroute to 192.168.2.2 (192.168.2.2), 30 hops at most, 40 bytes each packet, press CTRLC to break1 192.168.1.1 (192.168.1.1) 0.760 ms 0.497 ms 0.318 ms2 2.2.2.2 (2.2.2.2) 1.428 ms 1.806 ms 1.078 ms3 192.168.2.2 (192.168.2.2) 0.993 ms 1.629 ms 1.590 msPC13.2 PC2业务测试PC2ping 192.168.1.2Ping 192.168.1.2 (192.168.1.2): 56 data bytes, press CTRLC to break56 bytes from 192.168.1.2: icmp_seq0 ttl253 time1.426 ms56 bytes from 192.168.1.2: icmp_seq1 ttl253 time1.317 ms56 bytes from 192.168.1.2: icmp_seq2 ttl253 time1.505 ms56 bytes from 192.168.1.2: icmp_seq3 ttl253 time1.903 ms56 bytes from 192.168.1.2: icmp_seq4 ttl253 time1.122 ms--- Ping statistics for 192.168.1.2 ---5 packet(s) transmitted, 5 packet(s) received, 0.0% packet lossround-trip min/avg/max/std-dev 1.122/1.455/1.903/0.258 msPC2PC2PC2%Aug 10 10:40:56:745 2026 PC2 PING/6/PING_STATISTICS: Ping statistics for 192.168.1.2: 5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss, round-trip min/avg/max/std-dev 1.122/1.455/1.903/0.258 ms.PC2tracert 192.168.1.2traceroute to 192.168.1.2 (192.168.1.2), 30 hops at most, 40 bytes each packet, press CTRLC to break1 192.168.2.1 (192.168.2.1) 0.635 ms 0.389 ms 0.530 ms2 2.2.2.1 (2.2.2.1) 0.702 ms 0.800 ms 1.340 ms3 192.168.1.2 (192.168.1.2) 1.104 ms 1.036 ms 1.077 msPC23.3 wireshark抓包分析1.查看到隧道抓包没有其他任何封装只有ipv4地址封装2.一个模拟器bug开始抓包会丢包