组网及说明
1.组网
2.需求
分支MSR2和分支MSR3分别和总部MSR1建立L2TP VPN，并且分支之间能够通过总部互访。
配置步骤
3.关键配置
LNS：
#
interface LoopBack0
ip address 192.168.1.1 255.255.255.0
#
interface GigabitEthernet0/0
port link-mode route
combo enable copper
ip address 1.1.1.2 255.255.255.252
nat outbound
#
ip pool huqi 66.66.66.3 66.66.66.65
#
interface Virtual-Template1
ppp authentication-mode pap chap
remote address pool huqi
ip address 66.66.66.66 255.255.255.0
#
l2tp-group 1 mode lns
allow l2tp virtual-template 1
undo tunnel authentication
tunnel name H3C-LNS
#
l2tp enable
#
local-user huqi class network
password simple huqi
service-type ppp
authorization-attribute user-role network-operator
#
ip route-static 0.0.0.0 0 1.1.1.1
ip route-static 192.168.2.0 24 66.66.66.1
ip route-static 192.168.3.0 24 66.66.66.2
#
LAC1:
#
interface LoopBack0
ip address 192.168.2.1 255.255.255.0
#
interface GigabitEthernet0/0
port link-mode route
combo enable copper
ip address 2.2.2.2 255.255.255.252
nat outbound
#
interface Virtual-PPP0
ppp chap password simple huqi
ppp chap user huqi
ip address 66.66.66.1 255.255.255.0
l2tp-auto-client l2tp-group 1
#
l2tp-group 1 mode lac
lns-ip 1.1.1.2
undo tunnel authentication
tunnel name H3C-LAC1
#
l2tp enable
#
ip route-static 0.0.0.0 0 2.2.2.1
ip route-static 192.168.1.0 24 Virtual-PPP0
ip route-static 192.168.3.0 24 Virtual-PPP0
#
LAC2:
#
interface LoopBack0
ip address 192.168.3.1 255.255.255.0
#
interface GigabitEthernet0/0
port link-mode route
combo enable copper
ip address 3.3.3.2 255.255.255.252
nat outbound
#
interface Virtual-PPP0
ppp chap password simple huqi
ppp chap user huqi
ip address 66.66.66.2 255.255.255.0
l2tp-auto-client l2tp-group 1
#
l2tp-group 1 mode lac
lns-ip 1.1.1.2
undo tunnel authentication
tunnel name H3C-LAC2
#
l2tp enable
#
ip route-static 0.0.0.0 0 3.3.3.1
ip route-static 192.168.1.0 24 Virtual-PPP0
ip route-static 192.168.2.0 24 Virtual-PPP0
#
配置关键点
4.测试
LNS侧：
[LNS]dis l2tp tunnel
LocalTID RemoteTID State Sessions RemoteAddress RemotePort RemoteName
31954 65062 Established 1 3.3.3.2 1701 H3C-LAC2
47746 55251 Established 0 2.2.2.2 1701 H3C-LAC1
LAC1侧：
[LAC1]dis l2tp tunnel
LocalTID RemoteTID State Sessions RemoteAddress RemotePort RemoteName
55251 47746 Established 0 1.1.1.2 1701 H3C-LNS
[LAC1]ping -a 192.168.2.1 192.168.1.1
Ping 192.168.1.1 (192.168.1.1) from 192.168.2.1: 56 data bytes, press CTRL_C to break
56 bytes from 192.168.1.1: icmp_seq=0 ttl=255 time=2.000 ms
56 bytes from 192.168.1.1: icmp_seq=1 ttl=255 time=1.000 ms
56 bytes from 192.168.1.1: icmp_seq=2 ttl=255 time=1.000 ms
56 bytes from 192.168.1.1: icmp_seq=3 ttl=255 time=2.000 ms
56 bytes from 192.168.1.1: icmp_seq=4 ttl=255 time=1.000 ms
--- Ping statistics for 192.168.1.1 ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 1.000/1.400/2.000/0.490 ms
[LAC1]%Jun 23 00:52:37:991 2020 LAC1 PING/6/PING_STATISTICS: Ping statistics for 192.168.1.1: 5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss, round-trip min/avg/max/std-dev = 1.000/1.400/2.000/0.490 ms.
[LAC1]ping -a 192.168.2.1 192.168.3.1
Ping 192.168.3.1 (192.168.3.1) from 192.168.2.1: 56 data bytes, press CTRL_C to break
56 bytes from 192.168.3.1: icmp_seq=0 ttl=254 time=3.000 ms
56 bytes from 192.168.3.1: icmp_seq=1 ttl=254 time=2.000 ms
56 bytes from 192.168.3.1: icmp_seq=2 ttl=254 time=3.000 ms
56 bytes from 192.168.3.1: icmp_seq=3 ttl=254 time=2.000 ms
56 bytes from 192.168.3.1: icmp_seq=4 ttl=254 time=5.000 ms
--- Ping statistics for 192.168.3.1 ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 2.000/3.000/5.000/1.095 ms
LAC2侧：
[LAC2]dis l2tp tunnel
LocalTID RemoteTID State Sessions RemoteAddress RemotePort RemoteName
65062 31954 Established 0 1.1.1.2 1701 H3C-LNS
[LAC2]ping -a 192.168.3.1 192.168.1.1
Ping 192.168.1.1 (192.168.1.1) from 192.168.3.1: 56 data bytes, press CTRL_C to break
56 bytes from 192.168.1.1: icmp_seq=0 ttl=255 time=1.000 ms
56 bytes from 192.168.1.1: icmp_seq=1 ttl=255 time=2.000 ms
56 bytes from 192.168.1.1: icmp_seq=2 ttl=255 time=2.000 ms
56 bytes from 192.168.1.1: icmp_seq=3 ttl=255 time=1.000 ms
56 bytes from 192.168.1.1: icmp_seq=4 ttl=255 time=3.000 ms
--- Ping statistics for 192.168.1.1 ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 1.000/1.800/3.000/0.748 ms
[LAC2]ping -a 192.168.3.1 192.168.2.1
Ping 192.168.2.1 (192.168.2.1) from 192.168.3.1: 56 data bytes, press CTRL_C to break
56 bytes from 192.168.2.1: icmp_seq=0 ttl=254 time=3.000 ms
56 bytes from 192.168.2.1: icmp_seq=1 ttl=254 time=3.000 ms
56 bytes from 192.168.2.1: icmp_seq=2 ttl=254 time=2.000 ms
56 bytes from 192.168.2.1: icmp_seq=3 ttl=254 time=2.000 ms
56 bytes from 192.168.2.1: icmp_seq=4 ttl=254 time=2.000 ms
--- Ping statistics for 192.168.2.1 ---
5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss
round-trip min/avg/max/std-dev = 2.000/2.400/3.000/0.490 ms
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