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Cisco 887VA Internet settings for Telecom Italia ADSL

bprietoclv
Level 1
Level 1

Good morning,

I am trying to set a Cisco 887VA router up for a ADSL Internet connection by Telecom Italia. I have been given the following IP parameters:

  • LAN IP Address: 85.36.247.40, Network mask: 255.255.255.248.
  • Default  gateway: 85.36.247.41.
  • Point-to-Point: 85.38.23.218, Network mask: 255.255.255.252.

This setting are a little bit confusing because the LAN IP addresses cannot be the 85.36.247.40 because that one will correspond to the network, not to a specific host. I have tried to set up every specific IP into the 85.36.247.40 subnet but I always get Status DOWN and Protocol DOWN with the show ip interface brief command. The internet configuration that I have written for the ATM interface is the following:

interface ATM0

no ip address

no ip route-cache

no atm auto-configuration

no atm ilmi-keepalive

hold-queue 224 in

!

interface ATM0.1 point-to-point

ip address 85.36.247.42 255.255.255.248

ip access-group 100 in

ip nat outside

ip inspect firewall out

ip virtual-reassembly in

no ip route-cache

pvc 8/35

  encapsulation aal5snap

!       

!

Could you please take a look at it and try to solve my doubt about IP addressing? I did configure some other Telecom Italia routers but not CISCO 887 and there is always some miss-understanding with the IP addressing, but finally I could configure them.

Thanks in advance,

Rafael Azpiroz Valverde.

1 Reply 1

acampbell
VIP Alumni
VIP Alumni

Rafael,

It looks like you have used the wrong IP address on the ATM interface

From your text :-

  • Point-to-Point: 85.38.23.218, Network mask: 255.255.255.252.

Change the config to this :-

!

interface ATM0.1 point-to-point

ip address 85.38.23.218 255.255.255.252

ip access-group 100 in

ip nat outside

ip inspect firewall out

ip virtual-reassembly in

no ip route-cache

pvc 8/35

encapsulation aal5snap

!

On the LAN interface use :-

int fast 0 (or what ever your port is)

ip address: 85.36.247.41 255.255.255.248

!

HTH

Alex

Regards, Alex. Please rate useful posts.
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