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session target ipv4:1.0.0.2
!
Cisco 827 Router Configuration 
The following is a configuration for the Cisco 827 router. You do not need to 
enter the commands marked “default.” These commands appear automatically in 
the configuration file that is generated when you use the show running-config 
command.
Current configuration:
!
version 12.0
no service pad (default)
service timestamps debug uptime (default)
service timestamps log uptime (default)
no service password-encryption (default)
hostname Cisco827
enable secret 5 $1$RnI.$K4mh5q4MFetaqKzBbQ7gv0
ip subnet-zero
no ip domain-lookup
ip dhcp-server 20.1.1.2
ipx routing 0010.7b7e.5499
!In the preceding command, the router MAC address is automatically 
used ! as the router IPX address.
!
interface Ethernet0
ip address 10.1.1.1 255.255.255.0
no ip directed-broadcast (default)
ipx network 100 novell-ether
!
interface ATM0
 ip address 14.0.0.17 255.0.0.0
 no ip directed-broadcast (default)
 no atm ilmi-keepalive (default)
pvc 8/35 
  protocol ip 14.0.0.1 no broadcast
  encapsulation aal5snap
!
router rip
version 2
network 10.0.0.0
network 30.0.0.0
no auto-summary
!
no ip http server (default) 
						

							 
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!
line con 0
exec-timeout 10 0
password 4youreyesonly
login
transport input none (default)
stopbits 1 (default)
line vty 0 4
password secret
login
!
end
Corporate or Endpoint Router Configuration for Data Network
This section shows a configuration that you can use to configure a Cisco 3600 
router as a corporate or endpoint router in your data network.You do not need to 
enter the commands marked “default.” These commands appear automatically in 
the configuration file that is generated when you use the show running-config 
command.
Current configuration:
!
version 12.0
no service pad (default)
service timestamps debug uptime (default)
service timestamps log uptime (default)
no service password-encryption (default)
!
hostname c3600
enable secret 5 $1$8TI8$WjLcYWgZ7EZhqH49Y2hJV!
ip subnet-zero
no domain-lookup
ipx routing 0010.7b7e.5498
!In the preceding command, the router MAC address is automatically 
used as the router IPX address.
!
interface Ethernet0
 ip address 20.0.0.1 255.0.0.0
 no ip directed-broadcast (default)
ipx network 200
!
router rip
version 2
network 20.0.0.0 
						

							 
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network 30.0.0.0
no auto-summary
!
no ip http server (default)
ip classless (default)
!
protocol ip 2.0.0.1 broadcast
!
line con 0
 exec-timeout 0 0
 transport input none (default)
 stopbits 1 (default)
line vty 0 4
password secret
login
!
end
Corporate or Endpoint Router Configuration for Data and Voice 
Network
This section shows a configuration that you can use to configure a Cisco 3600 
router as a corporate or endpoint router in your data and voice network.You do 
not need to enter the commands marked “default.” These commands appear 
automatically in the configuration file generated when you use the show 
running-config command.
Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname c3640
!
ip subnet-zero
!
cns event-service server
!
!
!
voice-port 1/0/0
 no echo-cancel enable 
						

							 
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voice-port 1/1/0
!
voice-port 1/1/1
!
dial-peer voice 101 pots
 destination-pattern 5552222
 port 1/0/0
!
dial-peer voice 102 pots
 destination-pattern 5554444
 port 1/0/1
!
dial-peer voice 103 pots
 destination-pattern 5556666
 port 1/1/0
!
dial-peer voice 104 pots
 destination-pattern 5558888
 port 1/1/1
dial-peer voice 1100 voip
 destination-pattern 5551111
 codec g711alaw
 ip precedence 5
 no vad
 session target ipv4:2.0.0.3
!
dial-peer voice 1101 voip
 destination-pattern 5553333
 codec g711alaw
 ip precedence 5
 no vad
 session target ipv4:2.0.0.3
!
dial-peer voice 1102 voip
 destination-pattern 5555555
 codec g711alaw
 ip precedence 5
 session target ipv4:2.0.0.3
!
dial-peer voice 1103 voip
 destination-pattern 5557777
 codec g711alaw
 ip precedence 5
 session target ipv4:2.0.0.3
!
process-max-time 200
! 
						

							 
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interface Ethernet0/1
 no ip address
 no ip directed-broadcast (default)
shutdown
!
router rip
version 2
network 3.0.0.0
!
ip classless (default)
ip route 0.0.0.0 0.0.0.0 Ethernet 0/0
ip route 1.0.0.0 255.0.0.0 3.0.0.0
ip route 2.0.0.0 255.0.0.0 3.0.0.1
ip route 5.0.0.0 255.0.0.0 3.0.0.1
ip route 40.0.0.0 255.255.255.0 172.28.9.1
ip route 172.28.5.0 255.255.255.0 172.28.9.1
ip route 172.28.9.0 255.255.255.0 172.28.9.1
no http server
!
line con 0
transport input none (default)
line aux 0
line vty 0 4
login
!
end 
						

							 
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							CHAPTER
 
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8
Advanced Router Configuration
This chapter includes advanced configuration procedures for the Cisco 800 series 
and Cisco SOHO series routers.
NoteEvery feature described is not necessarily supported on every router model. 
Where possible and applicable, these feature limitations will be listed.
If you prefer to use network scenarios to build a network, see Chapter 4, 
“Network Scenarios.” For basic router configuration topics, see Chapter 7, 
“Router Feature Configuration.”
This chapter contains the following sections:
Configuring Support for PPP over Ethernet, page 8-2
Configuring TCP Maximum Segment Size for PPPoE, page 8-5
Configuring Low Latency Queuing and Link Fragmentation and Interleaving, 
page 8-6
Configuring LFI, page 8-8
Configuring Class-Based Traffic Shaping to Support Low Latency Queuing, 
page 8-9
Configuring the Length of the PVC Transmit Ring, page 8-12
Configuring DHCP Server Import, page 8-14
Configuring IP Control Protocol Subnet Mask Delivery, page 8-20
Configuring the Service Assurance Agent, page 8-27
Configuring Secure Shell, page 8-28 
						

							 
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Configuring IP Named Access Lists, page 8-29
Configuring International Phone Support, page 8-29
Configuring Committed Access Rate, page 8-36
Configuring VPN IPSec Support Through NAT, page 8-37
NAT Default Inside Server Enhancement, page 8-38
Configuring VoAAL2 ATM Forum Profile 9 Support, page 8-40
Configuring ATM OAM F5 Continuity Check Support, page 8-44
Configuring RADIUS Support, page 8-49
Configuring Cisco Easy VPN Client, page 8-49
Configuring Dial-on-Demand Routing for PPPoE Client, page 8-52
Configuring Weighted Fair Queuing, page 8-55
Configuring DSL Commands, page 8-57
Configuring FTP Client, page 8-63
Configuring Authentication Proxy, page 8-63
Configuring Port to Application Mapping, page 8-64
Configuring CBAC Audit Trails and Alerts, page 8-64
Each section includes a configuration example and verification steps, as 
available. 
In some instances, certain features are supported across all Cisco 800 series and 
Cisco SOHO series router models. Router model feature restrictions or 
requirements are also listed in each applicable section in this chapter.
Configuring Support for PPP over Ethernet
The following sections describe how to configure support for PPP over Ethernet 
(PPPoE). 
Configuring PPPoE Client Support
Configuring TCP Maximum Segment Size for PPPoE 
						

							 
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Configuring Support for PPP over Ethernet
Configuring PPPoE Client Support
PPPoE is supported on the following Cisco routers:
Cisco 806 and 831
Cisco 826 and 836
Cisco 827, 827H, 827-4V, and 837
Cisco SOHO 77, SOHO 77H, SOHO 78, SOHO 96, and SOHO 97
Cisco 828 
The PPPoE client is supported on an ATM permanent virtual circuit (PVC). Only 
one PPPoE client is supported on a single ATM PVC.
Follow these steps to configure the router for PPPoE client support:
Step 1Configure the virtual private dialup network (VPDN) group number.
a.Enter the vpdn enable command in global configuration mode.
b.Configure the VPDN group by entering the vpdn group tag command.
c.Specify the dialing direction by entering the request-dialin command in the 
VPDN group.
d.Specify the type of protocol in the VPDN group by entering the protocol 
pppoe command. 
Step 2Configure the ATM interface with PPPoE support.
a.Configure the ATM interface by entering the interface atm 0 command.
b.Specify the ATM PVC by entering the pvc number command.
c.Configure the PPPoE client and specify the dialer interface to use for cloning 
by entering the pppoe-client dial-pool-number number command. 
Step 3Configure the dialer interface by entering the int dialer number command.
a.Configure the IP address as negotiated by entering the 
ip address negotiatedcommand.
b.(Optional) Configure authentication for your network by entering the ppp 
authentication protocol command.
c.Configure the dialer pool number by entering the dialer pool number 
command.  
						

							 
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d.Configure the dialer-group number by entering the dialer-group number 
command.
e.Configure a dialer list corresponding to the dialer-group by entering the 
dialer-list 1 protocol ip permit command.
NoteMultiple PPPoE clients can run on a different PVCs, in which case each client 
has to use a separate dialer interface and a separate dialer pool, and the PPP 
parameters need to be applied on the dialer interface.
A PPPoE session is initiated on the client side by the network. If the session has 
a timeout or is disconnected, the PPPoE client immediately attempts to reestablish 
the session. 
If you enter the clear vpdn tunnel pppoe command with a PPPoE client session 
already established, the PPPoE client session stops, and the PPPoE client 
immediately tries to reestablish the session. 
Configuration Example
The following example shows a configuration of a PPPoE client.
vpdn enable
vpdn-group 1
request-dialin
protocol pppoe
int atm0
pvc 1/100
pppoe-client dial-pool-number 1
int dialer 1
ip address negotiated
ppp authentication chap
dialer pool 1
dialer-group 1