IPV6 DEPLOYMENT FOR ADSL
Address allocation and Configuration
ADSL Access Networks Overview
 AdSL Configuration For IPv6
 Recommended Address Allocation

ADSL ACCESS NETWORKS OVERVIEW
ADSL ACCESS NETWORKS
PROTOCOL STACK - PPP OVER ATM
ADSL CONFIGURATION
LNS AND BAS CONFIGURATION

LNS configuration
ipv6 unicast-routing
aaa new-model
aaa authentication ppp default group tacacs+
aaa authorization network default group tacacs+
aaa authorization configuration NITC group tacacs+
vpdn-group 1
accept-dialin
protocol l2tp
virtual-template 1
interface Virtual-Template1
ipv6 enable
no ipv6 nd suppress-ra
ipv6 dhcp server ADSL-Pool
ppp authentication chap callin
ipv6 dhcp pool ADSL-Pool
prefix-delegation aaa method-list NITC

BAS Unaware of this configuration
RECOMMENDED ADDRESS ALLOCATION
IPV6 ADDRESS ALLOCATION GUIDELINE
RFC 3177 recommends the following :
A single PC, with no additional need to subnet,
dialing-up from a hotel room may receive its /128
IPv6 address for a PPP style connection as part of
a /64 prefix.
 Give Home/SOHO a permanent /64 – single link
 Short-lived /64 from a prefix-pool
A Separate /64 is assigned each user/interface. The
prefix is advertised in RA’s and a route is
installed in the RIB.

GIVE HOME USERS A PERMANENT /64 –
SINGLE LINK
SHORT-LIVED
/128
THANK YOU