A VPDN tunnel was built using Layer 2 Forwarding (L2F), Layer 2
Tunneling Protocol (L2TP), Point-to-Point Tunneling Protocol (PPTP), or Point-to-
Point over Ethernet (PPPoE). The tunnel used UDP port 1702 to carry encapsulated
PPP datagrams and control messages between the endpoints. Routers with Cisco
IOS Release 12.2(13)T or earlier require the additional VPDN programming.
Step 2: Con?¬?gure the Dialer Interface
Edmonton(config)#interface dialer0 Enters interface
con?¬?guration mode
Edmonton(config-if)#ip address negotiated Obtains IP address via
PPP/IPCP address
negotiation
Edmonton(config-if)#ip mtu 1492 Accommodates for the
6-octet PPPoE header to
eliminate fragmentation in
the frame
Edmonton(config-if)#ip tcp adjust-mss 1452 Adjusts the maximum
segment size (MSS)
of TCP SYN packets
going through a router
to eliminate fragmentation
in the frame
Edmonton(config-if)#encapsulation ppp Enables PPP encapsulation
on the dialer interface
Edmonton(config-if)#dialer pool 1 Links the dialer interface
with the physical interface
Ethernet 0/1
NOTE: The ISP de?¬?nes
the type of authentication
to use.
Con?¬?guration Example: DSL Using PPPoE 7
For Password Authentication Protocol (PAP)
For Challenge Handshake Authentication Protocol (CHAP)
Step 3: De?¬?ne Interesting Traf?¬?c and Specify Default Routing
Edmonton(config-if)#ppp authentication pap
callin
Uses PAP for authentication
Edmonton(config-if)#ppp pap sent-username
pieman password bananacream
Enables outbound PAP
user authentication with a
username of pieman and a
password of bananacream
Edmonton(config-if)#ppp authentication chap
callin
Enables outbound CHAP
user authentication
Edmonton(config-if)#ppp chap hostname pieman Submits the CHAP
username
Edmonton(config-if)#ppp chap password
bananacream
Submits the CHAP
password
Edmonton(config-if)#exit Exits programming level
Edmonton(config)#dialer-list 2 protocol ip
permit
Declares which traf?¬?c
will invoke the dialing
mechanism
Edmonton(config)#interface dialer0 Enters interface mode
Edmonton(config-if)#dialer-group 2 Applies the ???interesting
traf?¬?c??? rules in dialer-list 2
Edmonton(config)#ip route 0.
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