eNSP——vpn技术-gre与mgre_ensp路由器gre

分析 

如图，IP地址全部给好，我们只需要按着要求进行配置命令即好

1、R5作为ISP，即公网区域，公网区域包括了R5，R5的回环接口、R1的s4/0/0接口、R2的s4/0/0接口、R3的s4/0/0接口，与R4的g0/0/1接口。R1R2R3R4后连着私网。对ISP仅进行IP地址的配置，主机PC我选择手动配置。

2、点到点网络认证的配置，hdlc的封装与ppp协议的pap认证、chap认证，用户名密码随机。

3、今天的主要学习内容GRE与MGRE，用vpn虚拟专用网技术，建立隧道，实行封装，虚拟链路连通总部与分支，分支与分支，跨域公网（但实际还是要经过公网的转发），实现虚拟链路上点到点、点到多点（实际上也是gre封装）的数据传送。

4、rip协议宣告网段，形成完整的路由表，实现全网可达.就是要注意rip带来的问题：一是gre是点到点网络封装技术，即单播，而rip机制为多播（不可改变），单播导致分支上收不到中心想要传递的信息，因为中心只能发给一个分支，解决这个矛盾的方法就是改变环境，手工开启环境的多播模式；二是rip协议具有水平分割毒性逆转的防环技术，为避免环路设置，“从此口金不从此口出规则导致，仅仅依靠tunnel链路的数据包传送只能单向，分支路由表的信息不全，是rip机制问题，所以我们只能关掉rip的水平分割机制，所以对于这个问题，我们也要从最开始的规划中尽量避免环路。

5、私网可以访问公网网址，做缺省路由和nat协议，使PC可以访问R5回环

配置思路

一、路由器IP，主机IP及回环配置

二、hdlc与ppp的封装与认证

三、实现物理链路私网公网可达，私网可访问公网，但私网之间要看后面

四、建立隧道，实现r1r2r3的mgre封装

五、建立隧道，实现r1r4之间的gre封装

六、rip宣告，在mgre上，解决两个问题

配置过程：

一、路由器

[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip add 192.168.1.1 24
Jan 25 2024 12:04:24-08:00 R1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface GigabitEthernet0/0/0 has entered the UP state. 
[R1-GigabitEthernet0/0/0]q
 
[R1]int s4/0/0
[R1-Serial4/0/0]ip add 15.0.0.1 24
[R1-Serial4/0/0]q
 

[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]ip add 192.168.2.1 24
Jan 25 2024 12:07:03-08:00 R2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface GigabitEthernet0/0/0 has entered the UP state. 
[R2-GigabitEthernet0/0/0]q
[R2]
[R2]int s4/0/0
[R2-Serial4/0/0]ip add 25.0.0.1 24
[R2-Serial4/0/0]q
 

[R3]int g0/0/0
[R3-GigabitEthernet0/0/0]ip add 192.168.3.1 24
Jan 25 2024 12:08:24-08:00 R3 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface GigabitEthernet0/0/0 has entered the UP state. 
[R3-GigabitEthernet0/0/0]q
[R3]
[R3]int s4/0/0
[R3-Serial4/0/0]ip add 35.0.0.1 24
[R3-Serial4/0/0]q

[R4]int g0/0/0
[R4-GigabitEthernet0/0/0]ip add 192.168.4.1 24
Jan 25 2024 12:10:17-08:00 R4 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface GigabitEthernet0/0/0 has entered the UP state. 
[R4-GigabitEthernet0/0/0]q
[R4]
[R4]int g0/0/1
[R4-GigabitEthernet0/0/1]ip add 45.0.0.1 24
Jan 25 2024 12:10:36-08:00 R4 %%01IFNET/4/LINK_STATE(l)[1]:The line protocol IP 
on the interface GigabitEthernet0/0/1 has entered the UP state. 
[R4-GigabitEthernet0/0/1]q

[ISP]int g0/0/0
[ISP-GigabitEthernet0/0/0]ip add 45.0.0.2 24
Jan 25 2024 12:12:25-08:00 ISP %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
 on the interface GigabitEthernet0/0/0 has entered the UP state. 
[ISP-GigabitEthernet0/0/0]q
[ISP]int s3/0/0
[ISP-Serial3/0/0]ip add 15.0.0.2 24
[ISP-Serial3/0/0]
Jan 25 2024 12:12:50-08:00 ISP %%01IFNET/4/LINK_STATE(l)[1]:The line protocol PP
P IPCP on the interface Serial3/0/0 has entered the UP state. 
[ISP-Serial3/0/0]q
[ISP]int s3/0/1
[ISP-Serial3/0/1]ip add 25.0.0.2 24
[ISP-Serial3/0/1]
Jan 25 2024 12:13:22-08:00 ISP %%01IFNET/4/LINK_STATE(l)[2]:The line protocol PP
P IPCP on the interface Serial3/0/1 has entered the UP state. 
[ISP-Serial3/0/1]q
[ISP]int s4/0/0
[ISP-Serial4/0/0]ip add 35.0.0.2 24
[ISP-Serial4/0/0]
Jan 25 2024 12:14:04-08:00 ISP %%01PPP/4/SAMEIP(l)[3]:On the interface Serial4/0
/0, IPCP negotiation failed because the peer IP address was the same as local ad
dress. 
[ISP-Serial4/0/0]q
 
[ISP]
[ISP]int lo0
[ISP-LoopBack0]ip add 5.5.5.5 24
[ISP-LoopBack0]q
[ISP]

 

二、认证

用户名为huawei，密码为123456

R1和R5之间使用ppp的pap认证且R5为主认证方

[ISP]aaa
[ISP-aaa]local-user huawei password cipher 123456
Info: Add a new user.
[ISP-aaa]local-user huawei service-type ppp
 
[ISP]interface serial3/0/0
[ISP-Serial3/0/0]link-pro ppp
[ISP-Serial3/0/0]ppp au	
[ISP-Serial3/0/0]ppp authentication-mode pap
[ISP-Serial3/0/0]q

[R1]interface s4/0/0
[R1-Serial4/0/0]link-pro ppp
[R1-Serial4/0/0]ppp pap local-user huawei password cipher 123456
 
[R1-Serial4/0/0]shutdown
Jan 25 2024 12:29:48-08:00 R1 %%01PPP/4/PHYSICALDOWN(l)[10]:On the interface Ser
ial4/0/0, PPP link was closed because the status of the physical layer was Down.
 [R1-Serial4/0/0]undo shutdown
 
 
 

 查看接口状况 up证明协商成功

R1和R5之间使用ppp的chap认证且R5为主认证方

[ISP]int s3/0/1
[ISP-Serial3/0/1]link-pro ppp
[ISP-Serial3/0/1]ppp au	
[ISP-Serial3/0/1]ppp authentication-mode chap
[ISP-Serial3/0/1]q
 

[R2]int s4/0/0
[R2-Serial4/0/0]link-type ppp
                ^
Error: Unrecognized command found at '^' position.
[R2-Serial4/0/0]link-pro ppp
[R2-Serial4/0/0]ppp chap user huawei
[R2-Serial4/0/0]ppp chap password c
[R2-Serial4/0/0]ppp chap password cipher 123456
[R2-Serial4/0/0]
[R2-Serial4/0/0]
[R2-Serial4/0/0]shutdown
Jan 25 2024 12:44:01-08:00 R2 %%01IFPDT/4/IF_STATE(l)[10]:Interface Serial4/0/0 
has turned into DOWN state.
[R2-Serial4/0/0]
[R2-Serial4/0/0]undo shutdown
[R2-Serial4/0/0]
Jan 25 2024 12:44:17-08:00 R2 %%01IFPDT/4/IF_STATE(l)[11]:Interface Serial4/0/0 
has turned into UP state.
[R2-Serial4/0/0]q
[R2]

 

 协商成功

R3和R5之间使用HDLC封装

[ISP]interface Serial 4/0/0
[ISP-Serial4/0/0]link-pro hdlc
Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]
:y
Jan 25 2024 12:49:39-08:00 ISP %%01IFNET/4/CHANGE_ENCAP(l)[7]:The user performed
 the configuration that will change the encapsulation protocol of the link and t
hen selected Y. 
[ISP-Serial4/0/0]

[R3]int s4/0/0
[R3-Serial4/0/0]link-pro hdlc
Warning: The encapsulation protocol of the link will be changed. Continue? [Y/N]
:y
Jan 25 2024 12:51:21-08:00 R3 %%01IFNET/4/CHANGE_ENCAP(l)[7]:The user performed 
the configuration that will change the encapsulation protocol of the link and th
en selected Y. 
[R3-Serial4/0/0]
[R3-Serial4/0/0]shutdown
Jan 25 2024 12:51:26-08:00 R3 %%01IFPDT/4/IF_STATE(l)[11]:Interface Serial4/0/0 
has turned into DOWN state.
[R3-Serial4/0/0]
[R3-Serial4/0/0]
Jan 25 2024 12:51:26-08:00 R3 %%01IFNET/4/LINK_STATE(l)[12]:The line protocol IP
 on the interface Serial4/0/0 has entered the DOWN state. 
[R3-Serial4/0/0]
[R3-Serial4/0/0]undo shutdown
[R3-Serial4/0/0]
Jan 25 2024 12:51:35-08:00 R3 %%01IFPDT/4/IF_STATE(l)[13]:Interface Serial4/0/0 
has turned into UP state.
[R3-Serial4/0/0]
Jan 25 2024 12:51:35-08:00 R3 %%01IFNET/4/LINK_STATE(l)[14]:The line protocol IP
 on the interface Serial4/0/0 has entered the UP state. 
[R3-Serial4/0/0]

 

成功

三、物理链路PC访问公网

[R1]ip route-static 0.0.0.0 0 15.0.0.2
 
[R1]acl 2000
[R1-acl-basic-2000]rule permit source 192.168.1.0 0.0.0.255
[R1-acl-basic-2000]q
[R1]int s4/0/0
[R1-Serial4/0/0]nat outbound 2000
[R1-Serial4/0/0]q
[R1]

[R2]ip route-static 0.0.0.0 0 25.0.0.2
[R2]
[R2]acl 2000
[R2-acl-basic-2000]rule permit source 192.168.2.0 0.0.0.255
[R2-acl-basic-2000]q
[R2]int s4/0/0
[R2-Serial4/0/0]nat outbound 2000
[R2-Serial4/0/0]q

[R3]ip route-static 0.0.0.0 0 35.0.0.2
[R3]
[R3]acl 2000
[R3-acl-basic-2000]rule permit source 192.168.3.0 0.0.0.255
[R3-acl-basic-2000]q
[R3]int s4/0/0
[R3-Serial4/0/0]nat outbound 2000
[R3-Serial4/0/0]q

[R4]ip route-static 0.0.0.0 0 45.0.0.2
[R4]
[R4]acl 2000
[R4-acl-basic-2000]rule permit source 192.168.4.0 0.0.0.255
[R4-acl-basic-2000]q
[R4]int g0/0/1
[R4-GigabitEthernet0/0/1]nat outbound 2000
[R4-GigabitEthernet0/0/1]q

 

全部成功！

四、mgre

R1为中心，R2、R3为分支

[R1]
[R1]int tunnel 0/0/0
[R1-Tunnel0/0/0]ip add 192.168.5.1 24
[R1-Tunnel0/0/0]tunnel-protocol gre p2mp
[R1-Tunnel0/0/0]source 15.0.0.1
Jan 25 2024 13:20:07-08:00 R1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[R1-Tunnel0/0/0]
[R1-Tunnel0/0/0]nhrp network-id 100
[R1-Tunnel0/0/0]q

[R2]int t0/0/0
[R2-Tunnel0/0/0]ip add 192.168.5.2 24
[R2-Tunnel0/0/0]tunnel-protocol gre p2mp
[R2-Tunnel0/0/0]source s4/0/0
Jan 25 2024 13:24:06-08:00 R2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[R2-Tunnel0/0/0]nhrp network-id 100
[R2-Tunnel0/0/0]nhrp entry 192.168.5.1 15.0.0.1 r	
[R2-Tunnel0/0/0]nhrp entry 192.168.5.1 15.0.0.1 register 
[R2-Tunnel0/0/0]q

[R3]int t0/0/0
[R3-Tunnel0/0/0]tunnel-protocol gre p2mp
[R3-Tunnel0/0/0]ip add 192.168.5.3 24
[R3-Tunnel0/0/0]source 35.0.0.1
Jan 25 2024 13:28:31-08:00 R3 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/0 has entered the UP state. 
[R3-Tunnel0/0/0]
[R3-Tunnel0/0/0]nhrp network-id 100
[R3-Tunnel0/0/0]nhrp entry 192.168.5.1 15.0.0.1 register
[R3-Tunnel0/0/0]q

 中心获取到了这样一个nhrp表

r2r3都有去往中心的

两个分支之间没有，且主机之间仍不能相互访问因为路由表不全，随后我们解决这个问题。

五、gre

R1和R4之间为点到点的GRE

[R1]int tunnel0/0/1
[R1-Tunnel0/0/1]ip add 192.168.6.1 24
[R1-Tunnel0/0/1]tunnel-protocol gre
[R1-Tunnel0/0/1]source 15.0.0.1
[R1-Tunnel0/0/1]de	
[R1-Tunnel0/0/1]destination 45.0.0.1
Jan 25 2024 13:40:04-08:00 R1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/1 has entered the UP state. 
[R1-Tunnel0/0/1]
[R1-Tunnel0/0/1]q

[R4]int t0/0/1
[R4-Tunnel0/0/1]ip add 192.168.6.2 24
[R4-Tunnel0/0/1]tunnel-pro gre
[R4-Tunnel0/0/1]source 45.0.0.1
[R4-Tunnel0/0/1]destination 15.0.0.1
Jan 25 2024 13:42:04-08:00 R4 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP 
on the interface Tunnel0/0/1 has entered the UP state. 
[R4-Tunnel0/0/1]
[R4-Tunnel0/0/1]q

此时主机之间还是不能访问，两个直连接口可以通。因为没有互相路由

[R4]ip route-static 192.168.1.0 24 192.168.6.1

[R1]ip route-static 192.168.4.0 24 192.168.6.2

再次测试

pc1成功访问pc4

pc4成功访问pc1

gre环境建立成功

六、私有网络基于RIP全网可达

[R1]rip 1
[R1-rip-1]ver 2
[R1-rip-1]network 192.168.1.0
[R1-rip-1]network 192.168.6.0
[R1-rip-1]q
[R1]rip 1
[R1-rip-1]network 192.168.5.0
[R1-rip-1]q

[R2]rip 1
[R2-rip-1]ver 2
[R2-rip-1]network 192.168.2.0
[R2-rip-1]network 192.168.5.0
[R2-rip-1]q

[R3]rip 1
[R3-rip-1]ver 2
[R3-rip-1]network 192.168.3.0
[R3-rip-1]network 192.168.5.0
[R3-rip-1]q

[R4]rip 1
[R4-rip-1]ver 2
[R4-rip-1]network 192.168.4.0
[R4-rip-1]network 192.168.6.0
[R4-rip-1]q

 

R1的路由表是全的

R2上查不到，R3上也查不到

解决分支无路由表情况

一吧gre环境改变为多播，二把rip水平分割机制关闭 

[R1]int t0/0/0
[R1-Tunnel0/0/0]nhrp entry mu	
[R1-Tunnel0/0/0]nhrp entry multicast  dy	
[R1-Tunnel0/0/0]nhrp entry multicast  dynamic 
[R1-Tunnel0/0/0]
[R1-Tunnel0/0/0]q
[R1]
[R1]int t0/0/0
[R1-Tunnel0/0/0]undo rip split	
[R1-Tunnel0/0/0]undo rip split-horizon 
[R1-Tunnel0/0/0]
[R1-Tunnel0/0/0]
[R1-Tunnel0/0/0]q
[R1]

七、发现问题

我们来查看一下路由表

通向r4的rip为非活跃

是因为静态路由的优先级更高

在R4上也一样静态优先

这说明，R1 与R4的主机相互访问没有问题， R1R2R3的主机相互访问没有问题

pc1/pc2/pc3相互访问没有问题

问题在于，正常应该全网可通，但是如下图

4.0网段不能与2.0、3.0网段互通，即使R4的路由表里有2.0与3.0网段，但是发现R2、R3的路由表里没有4.0网段

 明明宣告都没有问题，为什么会这样？

正是因为静态路由的优先级比RIP优先级高，R1作为中心，把学习来的路由表共享给分支R2和R3，R1路由表里静态配置的4.0网段并不是通过RIP学习得来，R1并没有把4.0网段分享给R2和R3。

当我们将R1上通往R4的静态路由拿掉

[R1]undo ip route-static 192.168.4.0 255.255.255.0 192.168.6.2

路由表更新，通向R4为RIP学习

对于R4并没有影响

再次查看r2和r3路由表

路由表里有了R1分享来的4.0网段

检测

成功达到全网互通！！

总结

本次实验要求直接的关联性并不大，每一个点都是可以单独进行学习的，放在一起考察配置，可以发现某一块问题还是很清晰的。本次的重要是GRE环境与MGER环境 的工作原理，数据包的封装，和配置思路，最终实现全网可达。

没什么问题了叭。。。

这次没有可指正的错误，欢迎提问

拜拜~~~~