The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of L2TP.

Example: Configuring client-initiated L2TP tunnels

Network configuration

As shown in Figure 1, the hosts at different locations directly initiate tunneling requests to the LNS to access the private network. Configure the LNS as follows:

· Create two ISP domains to provide access services for the hosts.

· Assign the hosts to different subnets.

Figure 1 Network diagram

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Prerequisites

Perform the following tasks on the hosts:

· Assign Host A to the abc.com domain, and set its computer name to hosta.abc.com.

· Assign Host B to the def.com domain, and set its computer name to hostb.def.com.

Procedures

Configuring the LNS

# Enable L2TP.

<LNS> system-view

[LNS] l2tp enable

# Enable DHCP.

[LNS] dhcp enable

# Create local BAS IP address pool pool1.

[LNS] ip pool pool1 bas local

# Set the gateway address to 10.0.1.1, and specify the DNS server at 1.1.1.1 for the IP address pool.

[LNS-ip-pool-pool1] gateway 10.0.1.1 24

[LNS-ip-pool-pool1] dns-list 1.1.1.1

# Exclude 10.0.1.1 from IP address allocation.

[LNS-ip-pool-pool1] forbidden-ip 10.0.1.1

[LNS-ip-pool-pool1] quit

# Create local BAS IP address pool pool2.

[LNS] ip pool pool2 bas local

# Set the gateway address to 10.0.2.1, and specify the DNS server at 2.2.2.2 for the IP address pool.

[LNS-ip-pool-pool2] gateway 10.0.2.1 24

[LNS-ip-pool-pool2] dns-list 2.2.2.2

# Exclude 10.0.2.1 from IP address allocation.

[LNS-ip-pool-pool2] forbidden-ip 10.0.2.1

[LNS-ip-pool-pool2] quit

# Specify domain name abc.com in local BAS IP address pool pool1, and configure local authentication for PPP users in the domain.

[LNS] domain name abc.com

[LNS-isp-abc.com] authorization-attribute ip-pool pool1

[LNS-isp-abc.com] authentication ppp local

[LNS-isp-abc.com] accounting ppp local

[LNS-isp-abc.com] quit

# Specify domain name def.com in local BAS IP address pool pool2, and configure local authentication for PPP users in the domain.

[LNS] domain name def.com

[LNS-isp-def.com] authorization-attribute ip-pool pool2

[LNS-isp-def.com] authentication ppp local

[LNS-isp-def.com] accounting ppp local

[LNS-isp-def.com] quit

# Create interface Virtual-Template 1. Configure the VT interface to authenticate the peer by using CHAP in domain abc.com.

[LNS] interface virtual-template 1

[LNS-Virtual-Template1] ppp authentication-mode chap domain abc.com

[LNS-Virtual-Template1] quit

# Create interface Virtual-Template 2. Configure the VT interface to authenticate the peer by using CHAP in domain def.com.

[LNS] interface virtual-template 2

[LNS-Virtual-Template2] ppp authentication-mode chap domain def.com

[LNS-Virtual-Template2] quit

# Assign an IP address to Ten-GigabitEthernet 0/0/15.

[LNS] interface ten-gigabitethernet 0/0/15

[LNS-Ten-GigabitEthernet0/0/15] ip address 172.31.123.101 24

[LNS-Ten-GigabitEthernet0/0/15] quit

# Create local users, set their passwords, and enable the PPP service.

[LNS] local-user user1 class network

[LNS-luser-network-user1] password simple hello

[LNS-luser-network-user1] service-type ppp

[LNS-luser-network-user1] quit

[LNS] local-user user2 class network

[LNS-luser-network-user2] password simple hello

[LNS-luser-network-user2] service-type ppp

[LNS-luser-network-user2] quit

# Create L2TP group 1 in LNS mode.

[LNS] l2tp-group 1 mode lns

# Specify Virtual-Template 1 for receiving calls from the peer named hosta.abc.com.

[LNS-l2tp1] allow l2tp virtual-template 1 remote hosta.abc.com

# Disable tunnel authentication.

[LNS-l2tp1] undo tunnel authentication

[LNS-l2tp1] quit

# Create L2TP group 2 in LNS mode.

[LNS] l2tp-group 2 mode lns

# Specify Virtual-Template 2 for receiving calls from the peer named hostb.def.com.

[LNS-l2tp2] allow l2tp virtual-template 2 remote hostb.def.com

# Disable tunnel authentication.

[LNS-l2tp2] undo tunnel authentication

[LNS-l2tp2] quit

Configuring the hosts

1. Assign IP addresses 192.168.1.4 and 192.168.1.7 to Host A and Host B, respectively.

2. Create a virtual private L2TP network connection by using the Windows system, or install the L2TP LAC client software, such as WinVPN Client. If you use any other clients, make sure the LACs and the LNS use consistent names for tunnel setup.

3. Complete the following configuration procedure (the procedure depends on the client software):

¡ Specify the PPP usernames as user1 and user2 on Host A and Host B, respectively, and set their passwords to hello.

¡ Specify the Internet interface address of the security gateway as the IP address of the LNS. In this example, the IP address is 172.31.123.101, which is used by Ten-GigabitEthernet 0/0/15 on the LNS.

¡ Modify the connection attributes: set the protocol to L2TP, the encryption attribute to customized, and the authentication mode to CHAP.

¡ Configure routes for the hosts to reach the LNS at Layer 3.

Verifying the configuration

# On the LNS, use the display l2tp tunnel command to check the established L2TP tunnels.

[LNS] display l2tp tunnel

LocalTID RemoteTID State Sessions RemoteAddress RemotePort

RemoteName

36406 13 Established 1 192.168.1.4 1701

hosta.abc.com

11556 13 Established 1 192.168.1.7 1701

hostb.def.com

Configuration files

dhcp enable

ip pool pool1 bas local

gateway 10.0.1.1 mask 255.255.255.0

dns-list 1.1.1.1

forbidden-ip 10.0.1.1

ip pool pool2 bas local

gateway 10.0.2.1 mask 255.255.255.0

dns-list 2.2.2.2

forbidden-ip 10.0.2.1

interface Virtual-Template1

ppp authentication-mode chap domain abc.com

interface Virtual-Template2

ppp authentication-mode chap domain def.com

interface ten-gigabitethernet 0/0/15

ip address 172.31.123.101 255.255.255.0

domain name abc.com

authorization-attribute ip-pool pool1

authentication ppp local

accounting ppp local

domain name def.com

authorization-attribute ip-pool pool2

authentication ppp local

accounting ppp local

local-user user1 class network

password simple hello

service-type ppp

local-user user2 class network

password simple hello

service-type ppp

l2tp-group 1 mode lns

allow l2tp virtual-template 1 remote hosta.abc.com

undo tunnel authentication

l2tp-group 2 mode lns

allow l2tp virtual-template 2 remote hostb.def.com

undo tunnel authentication

l2tp enable

Example: Configuring LAC-auto-initiated L2TP tunnels

Network configuration

As shown in Figure 2, configure each LAC to establish an L2TP tunnel with the LNS in LAC-auto-initiated mode. When Host A and Host B initiate connections, they use the established tunnels to access Site 1 and Site 2, respectively.

Figure 2 Network diagram

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Procedures

Configuring Router C

# Enable L2TP.

<RouterC> system-view

[RouterC] l2tp enable

# Create local users, set their passwords, and enable the PPP service.

[RouterC] local-user user1 class network

[RouterC-luser-network-user1] password simple 1234

[RouterC-luser-network-user1] service-type ppp

[RouterC-luser-network-user1] quit

[RouterC] local-user user2 class network

[RouterC-luser-network-user2] password simple 1234

[RouterC-luser-network-user2] service-type ppp

[RouterC-luser-network-user2] quit

# Configure VPN instances vpn1 and vpn2.

[RouterC] ip vpn-instance vpn1

[RouterC-vpn-instance-vpn1] route-distinguisher 100:1

[RouterC-vpn-instance-vpn1] vpn-target 100:1 import-extcommunity

[RouterC-vpn-instance-vpn1] vpn-target 100:1 export-extcommunity

[RouterC-vpn-instance-vpn1] quit

[[RouterC] ip vpn-instance vpn2

[RouterC-vpn-instance-vpn2] route-distinguisher 200:1

[RouterC-vpn-instance-vpn2] vpn-target 200:1 import-extcommunity

[RouterC-vpn-instance-vpn2] vpn-target 200:1 export-extcommunity

[RouterC-vpn-instance-vpn2] quit

# Enable DHCP.

[RouterC] dhcp enable

# Configure local BAS IP address pool pool1.

[RouterC] ip pool pool1 bas local

[RouterC-ip-pool-pool1] gateway 100.0.0.1 24

[RouterC-ip-pool-pool1] dns-list 3.3.3.3

# Exclude 100.0.0.1 from IP address allocation.

[RouterC-ip-pool-pool1] forbidden-ip 100.0.0.1

# Apply local BAS IP address pool pool1 to VPN instance vpn1.

[RouterC-ip-pool-pool1] vpn-instance vpn1

[RouterC-ip-pool-pool1] quit

# Configure local BAS IP address pool pool2.

[RouterC] ip pool pool2 bas local

[RouterC-ip-pool-pool2] gateway 101.0.0.1 24

[RouterC-ip-pool-pool2] dns-list 4.4.4.4

# Exclude 101.0.0.1 from IP address allocation.

[RouterC-ip-pool-pool2] forbidden-ip 101.0.0.1

# Apply local BAS IP address pool pool2 to VPN instance vpn2.

[RouterC-ip-pool-pool2] vpn-instance vpn2

[RouterC-ip-pool-pool2] quit

# Specify domain name abc.com in local BAS IP address pool pool1, and configure local authentication for PPP users in the domain.

[DeviceC] domain name abc.com

[DeviceC-isp-abc.com] authorization-attribute ip-pool pool1

[DeviceC-isp-abc.com] authentication ppp local

[DeviceC-isp-abc.com] quit

# Specify domain name def.com in local BAS IP address pool pool2, and configure local authentication for PPP users in the domain.

[DeviceC] domain name def.com

[DeviceC-isp-def.com] authorization-attribute ip-pool pool2

[DeviceC-isp-def.com] authentication ppp local

[DeviceC-isp-def.com] quit

# Create interface Virtual-Template 1.

[RouterC] interface virtual-template 1

# Configure the VT interface to authenticate the peer by using PAP in domain abc.com.

[RouterC-Virtual-Template1] ppp authentication-mode pap domain abc.com

# Associate Virtual-Template 1 with VPN instance vpn1.

[RouterC-Virtual-Template1] ip binding vpn-instance vpn1

[RouterC-Virtual-Template1] quit

# Create interface Virtual-Template 2.

[RouterC] interface virtual-template 2

# Configure the VT interface to authenticate the peer by using PAP in domain def.com.

[RouterC-Virtual-Template2] ppp authentication-mode pap domain def.com

# Associate Virtual-Template 2 with VPN instance vpn2.

[RouterC-Virtual-Template2] ip binding vpn-instance vpn2

[RouterC-Virtual-Template2] quit

# Create L2TP group 1 in LNS mode.

[RouterC] l2tp-group 1 mode lns

# Configure the local tunnel name as lns-A, and specify Virtual-Template 1 for receiving tunneling requests from lac-A.

[RouterC-l2tp1] tunnel name lns-A

[RouterC-l2tp1] undo tunnel authentication

[RouterC-l2tp1] allow l2tp virtual-template 1 remote lac-A

[RouterC-l2tp1] quit

# Create L2TP group 2 in LNS mode.

[RouterC] l2tp-group 2 mode lns

# Configure the local tunnel name as lns-B, and specify Virtual-Template 2 for receiving tunneling requests from lac-B.

[RouterC-l2tp2] tunnel name lns-B

[RouterC-l2tp2] undo tunnel authentication

[RouterC-l2tp2] allow l2tp virtual-template 2 remote lac-B

[RouterC-l2tp2] quit

# Assign IP addresses to interfaces, and associate interfaces with VPN instances.

[RouterC] interface ten-gigabitethernet 0/0/15

[RouterC-Ten-GigabitEthernet0/0/15] ip address 1.1.1.3 24

[RouterC-Ten-GigabitEthernet0/0/15] quit

[RouterC] interface ten-gigabitethernet 0/0/16

[RouterC-Ten-GigabitEthernet0/0/16] ip binding vpn-instance vpn1

[RouterC-Ten-GigabitEthernet0/0/16] ip address 5.0.0.1 8

[RouterC-Ten-GigabitEthernet0/0/16] quit

[RouterC] interface ten-gigabitethernet 0/0/17

[RouterC-Ten-GigabitEthernet0/0/17] ip binding vpn-instance vpn2

[RouterC-Ten-GigabitEthernet0/0/17] ip address 6.0.0.1 8

[RouterC-Ten-GigabitEthernet0/0/17] quit

Configuring Router A

# Enable L2TP.

<RouterA> system-view

[RouterA] l2tp enable

# Create L2TP group 1 in LAC mode.

[RouterA] l2tp-group 1 mode lac

# Configure the local tunnel name as lac-A, and specify the IP address of the tunnel peer (LNS).

[RouterA-l2tp1] tunnel name lac-A

[RouterA-l2tp1] undo tunnel authentication

[RouterA-l2tp1] lns-ip 1.1.1.3

[RouterA-l2tp1] quit

# Create Virtual-PPP 1. Configure its username and password as user1 and 1234 and PPP authentication as PAP.

[RouterA] interface virtual-PPP 1

[RouterA-Virtual-PPP1] ip address ppp-negotiate

[RouterA-Virtual-PPP1] ppp pap local-user user1 password simple 1234

[RouterA-Virtual-PPP1] quit

# Assign an IP address to Ten-GigabitEthernet 0/0/15.

[RouterA] interface ten-gigabitethernet 0/0/15

[RouterA-Ten-GigabitEthernet0/0/15] ip address 1.1.1.1 24

[RouterA-Ten-GigabitEthernet0/0/15] quit

# Configure a static route so that packets destined for Site 1 will be forwarded through the L2TP tunnel.

[RouterA] ip route-static 5.0.0.0 8 Virtual-PPP 1

# Trigger the LAC to establish an L2TP tunnel with the LNS.

[RouterA] interface virtual-PPP 1

[RouterA-Virtual-PPP1] l2tp-auto-client l2tp-group 1

[RouterA-Virtual-PPP1] quit

Configuring Router B

# Enable L2TP.

<RouterB> system-view

[RouterB] l2tp enable

# Create L2TP group 1 in LAC mode.

[RouterB] l2tp-group 1 mode lac

# Configure the local tunnel name as lac-B, and specify the IP address of the tunnel peer (LNS).

[RouterB-l2tp1] tunnel name lac-B

[RouterB-l2tp1] undo tunnel authentication

[RouterB-l2tp1] lns-ip 1.1.1.3

[RouterB-l2tp1] quit

# Create Virtual-PPP 1. Configure its username and password as user2 and 1234 and PPP authentication as PAP.

[RouterB] interface virtual-PPP 1

[RouterB-Virtual-PPP1] ip address ppp-negotiate

[RouterB-Virtual-PPP1] ppp pap local-user user2 password simple 1234

[RouterB-Virtual-PPP1] quit

# Assign an IP address to Ten-GigabitEthernet 0/0/15.

[RouterB] interface ten-gigabitethernet 0/0/15

[RouterB-Ten-GigabitEthernet0/0/15] ip address 1.1.1.2 24

[RouterB-Ten-GigabitEthernet0/0/15] quit

# Configure a static route so that packets destined for Site 2 will be forwarded through the L2TP tunnel.

[RouterB] ip route-static 6.0.0.0 8 virtual-PPP 1

# Trigger the LAC to establish an L2TP tunnel with the LNS.

[RouterB] interface virtual-PPP 1

[RouterB-Virtual-PPP1] l2tp-auto-client l2tp-group 1

[RouterB-Virtual-PPP1] quit

Verifying the configuration

# On Router A, verify that Virtual-PPP 1 has obtained an IP address from local BAS IP address pool pool1.

[RouterA] display interface virtual-ppp 1 brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface Link Protocol Primary IP Description

VPPP1 UP UP 100.0.0.2

# On Router B, verify that Virtual-PPP 1 has obtained an IP address from local BAS IP address pool pool2.

[RouterB] display interface virtual-ppp 1 brief

Brief information on interfaces in route mode:

Link: ADM - administratively down; Stby - standby

Protocol: (s) - spoofing

Interface Link Protocol Primary IP Description

VPPP1 UP UP 101.0.0.2

# Verify that Router A can ping 5.0.0.1 on Router C through the L2TP tunnel.

[RouterA] ping -a 100.0.0.2 5.0.0.1

Ping 5.0.0.1 (5.0.0.1): 56 data bytes, press CTRL_C to break

56 bytes from 5.0.0.1: icmp_seq=0 ttl=128 time=0.452 ms

56 bytes from 5.0.0.1: icmp_seq=1 ttl=128 time=0.625 ms

56 bytes from 5.0.0.1: icmp_seq=2 ttl=128 time=0.673 ms

56 bytes from 5.0.0.1: icmp_seq=3 ttl=128 time=0.687 ms

56 bytes from 5.0.0.1: icmp_seq=4 ttl=128 time=0.679 ms

--- Ping statistics for 5.0.0.1 ---

5 packets transmitted, 5 packets received, 0.0% packet loss

round-trip min/avg/max/std-dev = 0.452/0.623/0.687/0.088 ms

# Verify that Router B can ping 6.0.0.1 on Router C through the L2TP tunnel.

[RouterB] ping 6.0.0.1

Ping 6.0.0.1 (6.0.0.1): 56 data bytes, press CTRL_C to break

56 bytes from 6.0.0.1: icmp_seq=0 ttl=128 time=0.452 ms

56 bytes from 6.0.0.1: icmp_seq=1 ttl=128 time=0.625 ms

56 bytes from 6.0.0.1: icmp_seq=2 ttl=128 time=0.673 ms

56 bytes from 6.0.0.1: icmp_seq=3 ttl=128 time=0.687 ms

56 bytes from 6.0.0.1: icmp_seq=4 ttl=128 time=0.679 ms

--- Ping statistics for 6.0.0.1 ---

5 packets transmitted, 5 packets received, 0.0% packet loss

round-trip min/avg/max/std-dev = 0.452/0.623/0.687/0.088 ms

Configuration files

· Router C:

ip vpn-instance vpn1

route-distinguisher 100:1

vpn-target 100:1 import-extcommunity

vpn-target 100:1 export-extcommunity

ip vpn-instance vpn2

route-distinguisher 200:1

vpn-target 200:1 import-extcommunity

vpn-target 200:1 export-extcommunity

dhcp enable

ip pool pool1 bas local

vpn-instance vpn1

gateway 100.0.0.1 mask 255.255.255.0

dns-list 3.3.3.3

forbidden-ip 100.0.0.1

ip pool pool2 bas local

vpn-instance vpn2

gateway 101.0.0.1 mask 255.255.255.0

dns-list 4.4.4.4

forbidden-ip 101.0.0.1

interface Virtual-Template1

ppp authentication-mode pap domain abc.com

ip binding vpn-instance vpn1

interface Virtual-Template2

ppp authentication-mode pap

ip binding vpn-instance vpn2

interface ten-gigabitethernet 0/0/15

ip address 1.1.1.3 255.255.255.0

interface ten-gigabitethernet 0/0/16

ip binding vpn-instance vpn1

ip address 5.0.0.1 255.0.0.0

interface ten-gigabitethernet 0/0/17

ip binding vpn-instance vpn2

ip address 6.0.0.1 255.0.0.0

local-user user1 class network

password cipher $c$3$Wf7ut8Li9ryKmOvk53vSKPHvBQHOu8w=

service-type ppp

local-user user2 class network

password cipher $c$3$rpUZj85qaeXDflgm1P5af58Kj/maHXM=

service-type ppp

l2tp-group 1 mode lns

allow l2tp virtual-template 1 remote lac-A

undo tunnel authentication

tunnel name lns-A

l2tp-group 2 mode lns

allow l2tp virtual-template 2 remote lac-B

tunnel name lns-B

l2tp enable

domain name abc.com

authorization-attribute ip-pool pool1

authentication ppp local

domain name def.com

authorization-attribute ip-pool pool2

authentication ppp local

· Router A:

interface Virtual-PPP1

ppp pap local-user user1 password cipher $c$3$CYBBKjOoTx2nLdklyFk5zUtfXOKC5f8=

ip address ppp-negotiate

l2tp-auto-client l2tp-group 1

interface ten-gigabitethernet 0/0/15

ip address 1.1.1.1 255.255.255.0

ip route-static 5.0.0.0 8 Virtual-PPP1

l2tp-group 1 mode lac

lns-ip 1.1.1.3

undo tunnel authentication

tunnel name lac-A

l2tp enable

· Router B:

interface Virtual-PPP1

ppp pap local-user user2 password cipher $c$3$w9MwmqfWlBN/bbkspWTwTE9V3Zxe6Sk=

ip address ppp-negotiate

l2tp-auto-client l2tp-group 1

interface ten-gigabitethernet 0/0/15

ip address 1.1.1.2 255.255.255.0

ip route-static 6.0.0.0 8 Virtual-PPP1

l2tp-group 1 mode lac

lns-ip 1.1.1.3

undo tunnel authentication

tunnel name lac-B

l2tp enable

Example: Configuring L2TP load balancing

Network configuration

As shown in Figure 3, configure the LAC to establish an L2TP tunnel with each LNS for the hosts to access the private networks attached to the LNSs through PPPoE. Configure the LAC to perform weighted load balancing over the L2TP tunnels.

Figure 3 Network diagram

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Restrictions and guidelines

This example uses a RADIUS server to deliver tunnel attributes to the LAC. You also can configure L2TP load balancing at the CLI on the LAC.

You can use a RADIUS server to issue tunnel attributes for L2TP load balancing only when users use the same username and password, and only 1:1 load balancing is supported in this condition.

Prerequisites

# Assign IP addresses to interfaces as shown in Figure 3. (Details not shown.)

# Configure routing settings for the LAC to communicate with the LNSs and RADIUS server. (Details not shown.)

Procedures

Configuring the RADIUS server

NOTE:

This example uses a FreeRADIUS server that runs on Linux.

# Add the RADIUS client IP address and shared key to the clients.conf configuration file.

client 1.1.1.1/32 {

ipaddr = 1.1.1.1

netmask=32

secret = 123

}

# Add PPP user configuration to the users file.

user1 Cleartext-Password := "pass1"

Service-Type = Framed-User,

Framed-Protocol = PPP,

h3c-Remanent-Volume = "1",

Session-timeout =60,

Tunnel-Server-Endpoint:30 = "20.1.1.2 30.1.1.2",

Tunnel-Medium-Type:30 = IPv4,

Tunnel-Client-Auth-Id:30 = "LAC",

Tunnel-Type:30 = L2TP,

Tunnel-Password:30 = aabbcc,

When an L2TP user dials into the LAC, the LAC as a RADIUS client will submit user identity information to the RADIUS server. Then, the RADIUS server authenticates the user, returns the authentication result, and issues the tunnel attributes in Table 1 to the LAC for it to set up L2TP tunnels and sessions.

Table 1 Tunnel attributes issued to an LAC by a RADIUS server

Attribute No.	Attribute	Description
64	Tunnel-Type	Tunnel type. Only L2TP is supported.
65	Tunnel-Medium-Type	Tunnel medium type. Only IPv4 is supported.
67	Tunnel-Server-Endpoint	LNS IP address. Multiple IP addresses indicate 1:1 load balancing.
69	Tunnel-Password	Tunnel password.
90	Tunnel-Client-Auth-Id	LAC-end tunnel name.

Configuring the LAC

# Create RADIUS scheme rs1 and enter its view.

<LAC> system-view

[LAC] radius scheme rs1

# Specify the primary authentication and accounting servers, and set the shared key for secure RADIUS authentication and accounting communication.

[LAC-radius-rs1] primary authentication 1.1.1.2

[LAC-radius-rs1] primary accounting 1.1.1.2

[LAC-radius-rs1] key authentication simple 123

[LAC-radius-rs1] key accounting simple 123

[LAC-radius-rs1] quit

# Configure the LAC to remove the domain name from the username sent to the RADIUS server.

[LAC] user-name-format without-domain

# Create interface Virtual-Template 1. Configure the VT interface to authenticate the peer by using PAP in domain dm1.

[LAC] interface virtual-template 1

[LAC-Virtual-Template1] ppp authentication-mode pap domain dm1

[LAC-Virtual-Template1] quit

# Configure ISP domain dm1 to apply RADIUS scheme rs1 to PPP users.

[LAC] domain name dm1

[LAC-isp-dm1] authentication ppp radius-scheme rs1

[LAC-isp-dm1] accounting ppp radius-scheme rs1

[LAC-isp-dm1] authorization ppp radius-scheme rs1

[LAC-isp-dm1] quit

# Enable the PPPoE server on Ten-GigabitEthernet 0/0/15 and bind the interface to Virtual-Template 1.

[LAC] interface ten-gigabitethernet 0/0/15

[LAC-Ten-GigabitEthernet0/0/15] pppoe-server bind virtual-template 1

[LAC-Ten-GigabitEthernet0/0/15] quit

# Enable L2TP.

[LAC] l2tp enable

Configuring LNS 1

# Create local user user1, set its password, and enable the PPP service.

<LNS1> system-view

[LNS1] local-user user1 class network

[LNS1-luser-network-user1] password simple pass1

[LNS1-luser-network-user1] service-type ppp

[LNS1-luser-network-user1] quit

# Enable DHCP.

[LNS1] dhcp enable

# Enable recording client information in DHCP relay entries.

[LNS1] dhcp relay client-information record

# Create remote BAS IP address pool pool1. Set the gateway address to 192.168.1.1. Exclude IP address 192.168.1.1 from IP address allocation. Specify the remote DHCP server at 10.2.2.1 for the address pool.

[LNS1] ip pool pool1 bas remote

[LNS1-ip-pool-pool1] gateway 192.168.1.1 25

[LNS1-ip-pool-pool1] forbidden-ip 192.168.1.1

[LNS1-ip-pool-pool1] remote-server 10.2.2.1

[LNS1-ip-pool-pool1] quit

# Configure ISP domain dm1 to perform local authentication, accounting, and authorization for PPP users and apply address pool pool1 to the PPP users.

[LNS1] domain name dm1

[LNS1-isp-dm1] authentication ppp local

[LNS1-isp-dm1] accounting ppp local

[LNS1-isp-dm1] authorization ppp local

[LNS1-isp-dm1] authorization-attribute ip-pool pool1

[LNS1-isp-dm1] quit

# Create interface Virtual-Template 1. Configure the VT interface to authenticate the peer by using PAP in domain dm1.

[LNS1] interface virtual-template 1

[LNS1-virtual-template1] ppp authentication-mode pap domain dm1

[LNS1-virtual-template1] quit

# Enable L2TP.

[LNS1] l2tp enable

# Create L2TP group 1 in LNS mode.

[LNS1] l2tp-group 1 mode lns

# Configure the local tunnel name as LNS1, and specify Virtual-Template 1 for receiving calls from the LAC.

[LNS1-l2tp1] tunnel name LNS1

[LNS1-l2tp1] allow l2tp virtual-template 1 remote LAC

# Enable tunnel authentication, and specify the tunnel authentication key as aabbcc.

[LNS1-l2tp1] tunnel authentication

[LNS1-l2tp1] tunnel password simple aabbcc

[LNS1-l2tp1] quit

Configuring LNS 2

# Create local user user1, set its password, and enable the PPP service.

<LNS2> system-view

[LNS2] local-user user1 class network

[LNS2-luser-network-user1] password simple pass1

[LNS2-luser-network-user1] service-type ppp

[LNS2-luser-network-user1] quit

# Enable DHCP.

[LNS2] dhcp enable

# Enable recording client information in DHCP relay entries.

[LNS2] dhcp relay client-information record

# Create remote BAS IP address pool pool2. Set the gateway address to 192.168.1.129. Exclude IP address 192.168.1.129 from IP address allocation. Specify the remote DHCP server at 10.2.2.1 for the address pool.

[LNS2] ip pool pool2 bas remote

[LNS2-ip-pool-pool2] gateway 192.168.1.129 25

[LNS2-ip-pool-pool2] forbidden-ip 192.168.1.129

[LNS2-ip-pool-pool2] remote-server 10.2.2.1

[LNS2-ip-pool-pool2] quit

# Configure ISP domain dm1 to perform local authentication, accounting, and authorization for PPP users and apply address pool pool1 to the PPP users.

[LNS2] domain name dm1

[LNS2-isp-dm1] authentication ppp local

[LNS2-isp-dm1] accounting ppp local

[LNS2-isp-dm1] authorization ppp local

[LNS2-isp-dm1] authorization-attribute ip-pool pool2

[LNS2-isp-dm1] quit

# Create interface Virtual-Template 1. Configure the VT interface to authenticate the peer by using PAP in domain dm1.

[LNS2] interface virtual-template 1

[LNS2-virtual-template1] ppp authentication-mode pap domain dm1

[LNS2-virtual-template1] quit

# Enable L2TP.

[LNS2] l2tp enable

# Create L2TP group 1 in LNS mode.

[LNS2] l2tp-group 1 mode lns

# Configure the local tunnel name as LNS2, and specify Virtual-Template 1 for receiving calls from the LAC.

[LNS2-l2tp1] tunnel name LNS2

[LNS2-l2tp1] allow l2tp virtual-template 1 remote LAC

# Enable tunnel authentication, and specify the tunnel authentication key as aabbcc.

[LNS2-l2tp1] tunnel authentication

[LNS2-l2tp1] tunnel password simple aabbcc

[LNS2-l2tp1] quit

Configuring the DHCP server

# Enable DHCP.

<DHCP> system-view

[DHCP] dhcp enable

# Configure common IP address pool pool1.

[DHCP] ip pool pool1

[DHCP-ip-pool-pool1] network 192.168.1.0 25

[DHCP-ip-pool-pool1] gateway-list 192.168.1.1

[DHCP-ip-pool-pool1] dns-list 8.8.8.8

# Exclude 192.168.1.1 from IP address allocation.

[DHCP-ip-pool-pool1] forbidden-ip 192.168.1.1

[DHCP-ip-pool-pool1] quit

# Configure common IP address pool pool2.

[DHCP] ip pool pool2

[DHCP-ip-pool-pool2] network 192.168.1.128 25

[DHCP-ip-pool-pool2] gateway-list 192.168.1.129

[DHCP-ip-pool-pool2] dns-list 8.8.8.8

# Exclude 192.168.1.1 from IP address allocation.

[DHCP-ip-pool-pool2] forbidden-ip 192.168.1.129

[DHCP-ip-pool-pool2] quit

# Configure static routes to the LAC.

[DHCP] ip route-static 192.168.1.0 255.255.255.128 10.2.2.2

[DHCP] ip route-static 192.168.1.128 255.255.255.128 10.2.2.3

Configuring the hosts

# On the hosts, enter username user1 and password pass1 in the dial-up network window to dial a PPPoE connection.

Verifying the configuration

# Verify that Host A, Host B, and Host C have obtained IP addresses 192.168.1.2, 192.168.1.130. and 192.168.1.3, and they can ping the gateway.

# On LNS 1 and LNS 2, use the use the display l2tp session command to check the established L2TP sessions.

[LNS1] display l2tp session

LocalSID RemoteSID LocalTID State

Username

49545 10341 22365 Established

user1

24517 50848 22365 Established

user1

[LNS2] display l2tp session

LocalSID RemoteSID LocalTID State

Username

21869 45683 29701 Established

user1

# On the LAC, use the display l2tp tunnel command to check the established L2TP tunnels.

[LAC] display l2tp tunnel

LocalTID RemoteTID State Sessions RemoteAddress RemotePort

RemoteName

2349 22365 Established 2 20.1.1.2 1701

LNS1

47731 29701 Established 1 30.1.1.2 1701

LNS2

Configuration files

· LAC:

interface Virtual-Template1

ppp authentication-mode pap domain dm1

ip address 10.0.0.1 255.255.255.0

interface ten-gigabitethernet 0/0/15

pppoe-server bind virtual-template 1

pppoe-server access-line-id content all

interface ten-gigabitethernet 0/0/16

ip address 10.1.1.1 255.255.255.0

interface ten-gigabitethernet 0/0/17

ip address 1.1.1.1 255.255.255.0

ip route-static 0.0.0.0 0 10.1.1.2

radius scheme rs1

primary authentication 1.1.1.2

primary accounting 1.1.1.2

key authentication cipher $c$3$JWv9UgkAq9zqCA/zIgiY+2CNEa/y5w==

key accounting cipher $c$3$G+VGeU3QNguXqt2JfJhppzWUI/9S5w==

l2tp enable

· LNS 1:

dhcp enable

local-user user1 class network

password simple pass1

service-type ppp

ip pool pool1 bas remote

gateway 192.168.1.1 mask 255.255.255.128

forbidden-ip 192.168.1.1

remote-server 10.2.2.1

interface Virtual-Template1

ppp authentication-mode pap domain dm1

interface ten-gigabitethernet 0/0/15

ip address 20.1.1.2 255.255.255.0

interface ten-gigabitethernet 0/0/16

ip address 10.2.2.2 255.255.255.0

ip route-static 0.0.0.0 0 20.1.1.1

domain name dm1

authentication ppp local

accounting ppp local

authorization ppp local

authorization-attribute ip-pool pool1

l2tp-group 1 mode lns

allow l2tp virtual-template 1 remote LAC

tunnel authentication

tunnel password simple aabbcc

tunnel name LNS

l2tp enable

· LNS 2:

dhcp enable

local-user user1 class network

password simple pass1

service-type ppp

ip pool pool2 bas remote

gateway 192.168.1.129 mask 255.255.255.128

forbidden-ip 192.168.1.129

remote-server 10.2.2.1

interface Virtual-Template1

ppp authentication-mode pap domain dm1

interface ten-gigabitethernet 0/0/15

ip address 30.1.1.2 255.255.255.0

domain name dm1

authentication ppp local

accounting ppp local

authorization ppp local

authorization-attribute ip-pool pool2

interface ten-gigabitethernet 0/0/16

ip address 10.2.2.3 255.255.255.0

ip route-static 0.0.0.0 0 30.1.1.1

l2tp-group 1 mode lns

allow l2tp virtual-template 1 remote LAC

tunnel authentication

tunnel password simple aabbcc

tunnel name LNS

l2tp enable

· DHCP server:

dhcp enable

ip pool pool1

gateway-list 192.168.1.1

network 192.168.1.0 mask 255.255.255.128

forbidden-ip 192.168.1.1

ip pool pool2

gateway-list 192.168.1.128

network 192.168.1.129 mask 255.255.255.128

forbidden-ip 192.168.1.129

interface ten-gigabitethernet 0/0/15

ip address 10.2.2.1 255.255.255.0

ip route-static 192.168.1.0 25 10.2.2.2

ip route-static 192.168.1.128 25 10.2.2.3

02-Configuration Examples

Prerequisites

Configuration files

Example: Configuring LAC-auto-initiated L2TP tunnels

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