Creating Virtual Interface NVI0-which causing problem

Unanswered Question
Jun 13th, 2009

Dear All,

In a cisco DSL router.

Cisco 877 (MPC8272)

Having IOS version: c870-advsecurityk9-mz.124-15.T5.bin

I am getting a NVI0 interface and its taking the same IP as Vlan 1 IP, so I am not able tp reach the internal network as I am not able to ping VLAN 1even from the router itself. and i am not able to see this NVI0 interface in running config.

Please help

Following is the show commands output:

#show ip int bri

Interface IP-Address OK? Method Status Prot


FastEthernet0 unassigned YES unset up up

FastEthernet1 unassigned YES unset up down

FastEthernet2 unassigned YES unset up down

FastEthernet3 unassigned YES unset up down

ATM0 unassigned YES NVRAM up up

Vlan1 YES manual up up

NVI0 YES unset up up

Dialer1 YES IPCP up up

Virtual-Access1 unassigned YES unset up up

Loopback0 YES manual up up


interface Vlan1

ip address

ip access-group 110 in

ip mtu 1492

ip nat outside

ip virtual-reassembly

crypto ipsec client ezvpn easy-client inside

I have this problem too.
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Paolo Bevilacqua Sat, 06/13/2009 - 07:29

It is not a problem NVI0, but something wrong in your configuration.

for example your vlan1 interface, has unnecessary mtu and virtual-reassemply setting, then it's nat outside but ezvpn inside ?


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