Telecom Italia – IPv6 Pilot on Cisco

To my amazement, Telecom Italia released a pilot project of IPv6 deployment on residential/dynamic ip only adsl internet access, but on theirs support site there’s configuration only for some useless systems. So, I’ve decided to write a configuration for Cisco platform.

Usually the typical Telecom Italia PPPoE or PPPoA ADSL connection with dynamic IPv4 only was authenticated with “aliceadsl” as user and password, now with bran new credential along IPv4 the endpoint router advertise a IPv6 /64 class (always dynamic).

password: IPV6@alice6

And now IOS configuration:

– ATM inteface:

interface ATM0/0/0
no ip address
atm restart timer 300
no atm ilmi-keepalive
dsl operating-mode auto
hold-queue 100 in
interface ATM0/0/0.1 point-to-point
pvc 8/35
vbr-nrt 380 380
oam-pvc manage
encapsulation aal5mux ppp dialer
dialer pool-member 1

– Dialer inteface:

interface Dialer0
mtu 1492
ip address negotiated
ip nbar protocol-discovery
ip flow ingress
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ipv6 address autoconfig
ipv6 enable
no cdp enable
ppp authentication chap callin
ppp chap hostname
ppp chap password 0 IPV6@alice6
ppp pap sent-username password 0 IPV6@alice6

– Route configuration:

ip route Dialer0
ipv6 route 2000::/3 Dialer0

You can check with following command:

route01#sh ip int brief | sec Dialer0
Dialer0                    XXX.XXX.XXX.XXX    YES IPCP   up                    up
route01#sh ipv6 int brief | sec Dialer0
Dialer0                    [up/up]

You can discover your /64 assigned class with:

route01#sh ipv6 int di0 | sec Global
Global unicast address(es):
2A01:2003:xxxx:xxxx::1, subnet is 2A01:2003:xxxx:xxxx::/64 [PRE]
valid lifetime 2591993 preferred lifetime 604793

I’ve left out NAT and other further configuration.

Update: prefix delegation

Cisco – ATM Clockrate

If you have performance problem on Cisco 1721, Cisco 2610XM-2651XM, Cisco 2691, and Cisco 3660, with WIC-1DSL – IOS 12.3(2) or above, probably depends on the default value associated with ALL5 clockrate.

If yuo wanna check type the following command on your router:

hellroute01#show controller atm0/0 | include ATM0/0
Interface: ATM0/0, Hardware: DSLSAR (with Alcatel ADSL Module), State: up
SCC0 = 2600000 (ATM0/0)
SCC3 = 1000000 (ATM0/0)

If you get 2600000 (default value) on SCC0 or SCC1 your downlink speed rate probably is limitated at about 300 KB/s

For get full speed, put max supported value on aal5 clockrate like this:

hellroute01(config)#int atm0/0
hellroute01(config-if)#clock rate aal5 ?
2600000 (default)

<1000000-7000000> clock rates in bits per second, choose one from above

hellroute01(config-if)#clock rate aal5 7000000

Becareful the atm interface is automatically restart for apply the change. Then you lost connection on this interface.