1、VPN(封装 GRE) &NAT一、实验简述：1、用户需求1、两个私有网络通过 NAT 上公网2、两个私有网络通过 vpn 技术互联。实验环境：模拟用户需求，建立如图网络。 ROUTERDWN ROUTER UPPC192.6819.58 PC 172.80.1TUNEL192.680. 172.80.INTERT10.1-0.254 20.254ping -n 1 20.0.0.254Pinging 20.0.0.254 with 32 bytes of data:Reply from 20.0.0.254: bytes=32 time=30ms TTL=254down#down#2000-
2、1-2 05:39:11 IP Serial0/0: TX - s=10.0.0.1, d=20.0.0.254, g=10.0.0.254, len=6045 00 00 3C 46 AB 00 00 7F 01 D6 17 0A 00 00 01 Eping -n 1 172.18.0.1Pinging 172.18.0.1 with 32 bytes of data:Reply from 172.18.0.1: bytes=32 time=80ms TTL=126down#down#2000-1-2 05:43:22 IP Serial0/0: TX - s=10.0.0.1, d=20
3、.0.0.1, g=10.0.0.254, len=9245 00 00 5C 00 39 00 00 FF 2F 9D 38 0A 00 00 01 E.9./.814 00 00 01 A0 00 08 00 53 2D 00 00 00 00 04 D2 S-45 00 00 3C 47 21 00 00 E s=20.0.0.1, d=10.0.0.1, g=20.0.0.254, len=9245 00 00 5C 00 55 00 00 FF 2F 9D 1C 14 00 00 01 E.U./0A 00 00 01 A0 00 08 00 53 2D 00 00 00 00 04
4、 D2 S-45 00 00 3C 94 01 00 00 E3、路由器路由信息。Pc 路由Active Routes:Network Destination Netmask Gateway Interface Metric0.0.0.0 0.0.0.0 192.168.19.254 192.168.19.58 1127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1192.168.0.0 255.255.0.0 192.168.19.58 192.168.19.58 1192.168.19.58 255.255.255.255 127.0.0.1 127.0.0.
5、1 1192.168.19.255 255.255.255.255 192.168.19.58 192.168.19.58 1224.0.0.0 224.0.0.0 192.168.19.58 192.168.19.58 1255.255.255.255 255.255.255.255 192.168.19.58 192.168.19.58 1Default Gateway: 192.168.1.2=DOWN 路由器down#show ip routeCodes: C - connected, S - static, R - RIP, B - BGPD - BEIGRP, DEX - exte
6、rnal BEIGRP, O - OSPF, OIA - OSPF inter areaON1 - OSPF NSSA external type 1, ON2 - OSPF NSSA external type 2OE1 - OSPF external type 1, OE2 - OSPF external type 2S 0.0.0.0/0 1,0 via 10.0.0.254C 10.0.0.0/24 is directly connected, Serial0/0S 172.18.0.0/16 is directly connected, Tunnel1C 192.168.0.0/16
7、 is directly connected, FastEthernet0/0C 200.0.0.0/24 is directly connected, Tunnel1INTERNET 路由器x25_config#show routeC - Connected route, S - Static route, R - RIP route, O - OSPF routeNetwork Address Mask Gateway Metric PortC 10.0.0.0 255.255.255.0 10.0.0.254 1/0 S1C 20.0.0.0 255.255.255.0 20.0.0.2
8、54 1/0 S2UP 路由器up#show ip routeCodes: C - connected, S - static, R - RIP, B - BGPD - BEIGRP, DEX - external BEIGRP, O - OSPF, OIA - OSPF inter areaON1 - OSPF NSSA external type 1, ON2 - OSPF NSSA external type 2OE1 - OSPF external type 1, OE2 - OSPF external type 2S 0.0.0.0/0 1,0 via 20.0.0.254C 20.0.0.0/24 is directly connected, Serial0/0C 172.18.0.0/16 is directly connected, FastEthernet0/0S 192.168.0.0/16 is directly connected, Tunnel1C 200.0.0.0/24 is directly connected, Tunnel1
