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Chapter 8      Advanced Router Configuration
Configuring DHCP Server Import
Cisco SOHO 77, SOHO 77H, SOHO 78, SOHO 91, SOHO 96 and SOHO 97
Cisco 828
Follow the steps below to configure the Cisco router for DHCP server import:
Step 1Configure the asynchronous transfer mode (ATM) interface and the asymmetric 
digital subscriber line (ADSL) operating mode.
Step 2Create an ATM PVC for data traffic, enter virtual circuit configuration mode, 
and specify the virtual path identifier/virtual channel identifier (VPI/VCI) 
values, the encapsulation type, and the dial-pool member.
Step 3Create a dialer interface.
a.Enter configuration mode for the dialer interface.
b.Specify the MTU size as 1492.
c.Assign ip address negotiated to the dialer interface.
d.Configure the dialer group number. 
e.Configure PPP encapsulation and (if needed) Challenge Handshake 
Authentication Protocol (CHAP).
f.Configure IP negotiation of DNS and WINS requests.
Step 4Define an IP DHCP pool name.
a.Configure the network and domain name (if needed) for the DHCP pool.
b.Enter the import all command.
Step 5Configure a dialer list and a static route for the dialer interface.
Configuration Examples
The following example shows a configuration of the DHCP server import on the 
Cisco 800 series and Cisco SOHO series routers. 
router-820#show run
Building configuration...
Current configuration :1510 bytes
version 12.1
no service single-slot-reload-enable
no service pad 
						

							 
Chapter 8      Advanced Router Configuration
Configuring DHCP Server Import
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78-5372-06 service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname router-820
logging rate-limit console 10 except errors
!
username 3620-4 password 0 lab
mmi polling-interval 60
mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
no ip finger
no ip domain-lookup
!
ip dhcp excluded-address 192.150.2.100
ip dhcp pool 2
import all
network 192.150.2.0 255.255.255.0
domain-name devtest.com
default-router 192.150.2.100 
lease 0 0 3
!
no ip dhcp-client network-discovery
vpdn enable
no vpdn logging
vpdn-group 1
request-dialin
protocol pppoe
call rsvp-sync
!
interface Ethernet0
ip address 192.150.2.100 255.255.255.0
ip nat inside
!
interface ATM0
no ip address
no atm ilmi-keepalive
pvc 0/16 ilmi
!
pvc 1/40 
protocol pppoe
pppoe-client dial-pool-number 1
!
bundle-enable
dsl operating-mode auto 
						

							 
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Chapter 8      Advanced Router Configuration
Configuring DHCP Server Import
!
interface Dialer0
ip address negotiated
ip mtu 1492
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap
ppp ipcp dns request
ppp ipcp wins request
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
ip nat inside source list 101 interface Dialer0 overload
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101
snmp-server manager
!
voice-port 1
voice-port 2
voice-port 3
voice-port 4
!
line con 0
transport input none
stopbits 1
line vty 0 4
scheduler max-task-time 5000
end
The following example shows a DHCP proxy client configuration on the 
Cisco 800 series and Cisco SOHO series routers:
3620-4#show run
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 3620-4
logging rate-limit console 10 except errors
!
username 820-uut1 password 0 lab
username 820-uut4 password 0 lab 
						

							 
Chapter 8      Advanced Router Configuration
Configuring DHCP Server Import
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ip subnet-zero
!
no ip finger
!
ip address-pool dhcp-proxy-client
ip dhcp-server 192.150.1.101
vpdn enable
no vpdn logging
!
vpdn-group 1
accept-dialin
protocol pppoe
virtual-template 1
!
call rsvp-sync
cns event-service server
!
interface Ethernet0/0
ip address 192.150.1.100 255.255.255.0
half-duplex
!
interface Ethernet0/1
no ip address
shutdown
half-duplex
!
interface ATM1/0
no ip address
no atm scrambling cell-payload
no atm ilmi-keepalive
pvc 1/40 
encapsulation aal5snap
protocol pppoe
!
interface Virtual-Template1
ip address 2.2.2.1 255.255.255.0
ip mtu 1492
peer default ip address dhcp
ppp authentication chap
!
ip kerberos source-interface any
ip classless
ip route 0.0.0.0 0.0.0.0 Ethernet0/0
no ip http server
!
dialer-list 1 protocol ip permit
dial-peer cor custom 
						

							 
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Chapter 8      Advanced Router Configuration
Configuring DHCP Server Import
!
line con 0
exec-timeout 0 0
transport input none
line aux 0
line vty 0 4
login
end
The following example shows a configuration on the remote DHCP server on the 
Cisco 800 series and Cisco SOHO series routers.
2500ref-4#show run
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service udp-small-servers
service tcp-small-servers
!
hostname 2500ref-4
!
no logging console
!
ip subnet-zero
no ip domain-lookup
ip host PAGENT-SECURITY-V3 45.41.44.82 13.15.0.0
ip dhcp excluded-address 2.2.2.1
!
ip dhcp pool 1
network 2.2.2.0 255.255.255.0
dns-server 53.26.25.23 
netbios-name-server 66.22.66.22 
domain-name ribu.com
lease 0 0 5
!
cns event-service server
!
interface Ethernet0
ip address 192.150.1.101 255.255.255.0
interface Ethernet1
ip address 192.168.254.165 255.255.255.0
interface Serial0
no ip address
shutdown
no fair-queue
interface Serial1
no ip address 
						

							 
Chapter 8      Advanced Router Configuration
Configuring IP Control Protocol Subnet Mask Delivery
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!
ip classless
ip route 0.0.0.0 0.0.0.0 1.1.1.1
ip route 0.0.0.0 0.0.0.0 Ethernet0
no ip http server
!
dialer-list 1 protocol ip permit
line con 0
exec-timeout 0 0
transport input none
line aux 0
transport input all
line vty 0 4
login
no scheduler max-task-time
end
Configuring IP Control Protocol Subnet Mask 
Delivery
The IP control protocol subnet mask delivery feature is supported on the 
following Cisco routers:
Cisco 806
Cisco 826 and 836
Cisco 827, 827H, 827-4V, 831, and 837 
Cisco SOHO 77, SOHO 77H, SOHO 78, SOHO 91, SOHO 96, and SOHO 97
Cisco 828 
The IP Control Protocol (IPCP) feature assigns IP address pools to customer 
premises equipment (CPE) devices. These devices then assign IP addresses to the 
CPE and to a DHCP pool. 
IPCP provides the following functions:
The Cisco IOS CPE device requests and uses the subnet.
The authentication, authorization, and accounting (AAA) Remote 
Authentication Dial-In User Service (RADIUS) provides the subnet and 
inserts the framed route into the proper virtual route forwarding (VRF) table. 
						

							 
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Chapter 8      Advanced Router Configuration
Configuring IP Control Protocol Subnet Mask Delivery
The provider edge or the edge router helps in providing the subnet through 
IPCP.
DHCP is no longer supported on the client side because the CPE can now receive 
both the IP address and the subnet mask during the PPP setup negotiation. If the 
CPE uses the DHCP servers to allocate addresses for its own network, subnets can 
be assigned through the node route processor (NRP) on the network access server 
(NAS) and distributed to the remote CPE DHCP servers.
Follow the steps below to configure the CPE for IPCP:
Step 1Configure the ATM interface, and enter the ADSL operating mode.
Step 2Configure the ATM subinterface.
a.Create an ATM PVC for data traffic, enter virtual circuit configuration mode, 
and specify the VPI and VCI values.
b.Set the encapsulation of the PVC as aal5mux ppp to support data traffic.
Step 3Create a dialer interface.
a.Enter configuration mode for the dialer interface.
b.Specify the PPP encapsulation type for the PVC.
c.Enter the ip unnumbered Ethernet 0 command to assign the Ethernet 
interface to the dialer interface.
d.Configure the dialer group number. 
e.Configure CHAP.
f.Enter the ppp ipcp mask request command.
g.Assign a dialer list to this dialer interface.
Step 4Define an IP DHCP pool name.
a.Enter the import all command.
b.Enter the origin ipcp command.
Step 5Configure the Ethernet interface, and assign an IP address pool. Enter the pool 
name that you defined in Step 4. 
Step 6Configure a dialer list and a static route for the dialer interface. 
						

							 
Chapter 8      Advanced Router Configuration
Configuring IP Control Protocol Subnet Mask Delivery
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Configuration Examples
The following example shows a IPCP configuration on the Cisco 827-4V router:
router-8274v-1# show run
Building configuration...
Current configuration :1247 bytes
version 12.2
no service single-slot-reload-enable
no service pad
service timestamps debug datetime msec
service timestamps log uptime
no service password-encryption
!
hostname router-8274v-1
!
no logging buffered
logging rate-limit console 10 except errors
!
username 6400-nrp2 password 0 lab
ip subnet-zero
ip dhcp smart-relay
!
ip dhcp pool IPPOOLTEST
import all
origin ipcp
lease 0 0 1
!
no ip dhcp-client network-discovery
!
interface Ethernet0
ip address pool IPPOOLTEST
no shutdown
hold-queue 32 in
!
interface ATM0
no ip address
atm ilmi-keepalive
bundle-enable
dsl operating-mode auto
hold-queue 224 in
!
interface ATM0.1 point-to-point
pvc 1/40 
no ilmi manage
encapsulation aal5mux ppp dialer
dialer pool-member 1
! 
						

							 
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Chapter 8      Advanced Router Configuration
Configuring IP Control Protocol Subnet Mask Delivery
interface Dialer0
ip unnumbered Ethernet0
encapsulation ppp
dialer pool 1
dialer-group 1
no cdp enable
ppp authentication chap callin
ppp chap hostname router-8274v-1
ppp chap password 7 12150415
ppp ipcp accept-address
ppp ipcp dns request
ppp ipcp wins request
ppp ipcp mask request
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
dialer-list 1 protocol ip permit
!
line con 0
exec-timeout 0 0
stopbits 1
line vty 0 4
login
!
scheduler max-task-time 5000
end
The following example shows an IPCP configuration on the remote server for a 
Cisco 827-4V router:
6400-nrp2#show run
Building configuration...
Current configuration :1654 bytes
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 6400-nrp2
!
aaa new-model
aaa authentication ppp default group radius
aaa authorization network default group radius 
aaa nas port extended 
						

							 
Chapter 8      Advanced Router Configuration
Configuring IP Control Protocol Subnet Mask Delivery
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78-5372-06 enable password lab
!
username router-8274v-1 password 0 lab
username TB2-8274v-2 password 0 lab
!
redundancy
main-cpu
auto-sync standard
no secondary console enable
ip subnet-zero
no ip finger
!
interface ATM0/0/0
no ip address
no atm ilmi-keepalive
hold-queue 500 in
!
interface ATM0/0/0.4 point-to-point
pvc 6/40 
encapsulation aal5mux ppp Virtual-Template5
!
!interface ATM0/0/0.5 point-to-point
pvc 5/46 
protocol ip 7.0.0.60 broadcast
encapsulation aal5mux ppp Virtual-Template6
!
interface Ethernet0/0/1
no ip address
shutdown
!
interface Ethernet0/0/0
description admin IP address 192.168.254.201 255.255.255.0
ip address 192.168.254.240 255.255.255.0
!
interface FastEthernet0/0/0
ip address 192.168.100.101 255.255.255.0
half-duplex
!
interface Virtual-Template5
ip unnumbered FastEthernet0/0/0
no keepalive
no peer default ip address
ppp authentication chap
!
interface Virtual-Template6
ip unnumbered FastEthernet0/0/0
no peer default ip address
ppp authentication chap