Cannot assign an ip address to a router interface in Packet Tracer 6.3

[mihailolja]

Router(config-if)#ip address 192.168.8.0 255.255.255.0

                            ^

% Invalid input detected at '^' marker.

Any ideas anyone? Router is a 819HGW.

Thanks in advance.

Mihailo

[Mark Malone]

Is its a layer 2 port ? whats the interface number , 800 series only have a wan port and then 4 layer 2 ports usually
Other thing is try no switchport to make it layer3 , if that's not there its a switchport only and cant have an ip

[mihailolja]

Aha...it probably is a layer 2 port only then as the no switchport command
also fails. All 4 of the ethernet interfaces are behaving like this.

Is there a definitive way of determining if a port is a layer 2 port only?

[Mark Malone]

You wont have any IP commands available as its layer 2 only and IP commands are layer 3

you can also do sh interface x/x switchport may show you something too

800s are routers with extension lan modules so there known just to be layer 2 only , but on say a l2/l3 switch 3850 you can check the comamnds and also check can you make it a layer 3 port with no switchport

the data sheet for the device as well usually tells you what there capable of when your purchasing them , how many l3 and l2 or if both capable etc

[Mark Malone · Accepted solution]

You should have at least 1 wan port and 4 Ethernet ports at l2 on an 800  , no 1 below would be the wan

[mihailolja]

Brilliant, that makes total sense.

Thanks so much for your unselfish help!

Best Regards

Mihailo

[Mark Malone]

no problem glad I could help

[saurabh@npse.in]

The reason behind this is that you are assigning a Network ID. For that subnet 192.168.8.0 is a first IP which is always Network ID and it cannot be used to assign on any interface .
Thank you !

[mihailolja]

Yes 192.168.8.0 is a network id and incorrect but I tried numerous valid
addresses and they all failed.