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Beginner

Inconsistent address and mask

Hello guys, I new at this, I start studying CCNA and now I am at the beginning with CCENT. I made a simple topology in Packet Tracer: 1 PC, 1 Laptop, 1 Switch, 1 Router,1 Server I will attach a photo of it. I used the IP 192.168.100.1 to the interface of the router who binds the LAN and the mask 255.255.255.0, the PC it has 192.168.100.2 mask 255.255.255.0, the Laptop 192.168.100.3 mask 255.255.255.0 and the other interface of the router which leads to the Server IP 40.0.0.1 mask 255.255.255.0 and the Server IP 40.0.0.2 mask 255.255.255.0.

My problem is .... no mather what IP addresses I will use I will get the Error inconsistent address & mask when I use IP route.

There is connection between the LAN and the router but when I ping from the PC or laptop to the server I get connection timeout so I need to introduce IP Route in order to connect the LAN to the server.

I used IP route

R1(config)#ip route 40.0.0.2 255.255.255.0 192.168.100.1

%Inconsistent address and mask

R1(config)#ip route 40.0.0.2 255.255.255.0 40.0.0.1

%Inconsistent address and mask

R1(config)#ip route 40.0.0.2 255.255.255.0 40.0.0.1

%Inconsistent address and mask

R1(config)#ip route 40.0.0.2 255.255.255.0 192.168.100.1

%Inconsistent address and mask

R1(config)#ip route 40.0.0.2 255.255.255.0 192.168.100.0

%Inconsistent address and mask

Every way I do it I get the same result. Please help me! Tell me please what I am doing wrong! Help me understand please!

Pack.jpg

3 REPLIES 3
Hall of Fame Expert

Re: Inconsistent address and mask

Hello 1UNU1,

when using static routes you need to refer to base subnet address = all zeroes in the host portion not to a specific host in the prefix.

 

this is the right command

ip route 40.0.0.0 255.255.255.0 192.168.100.1

 

on the other hand this command is accepted

ip route 40.0.0.2 255.255.255.255 192.168.100.1

 

this last one is an host route /32 . The first example is for prefix 40.0.0.0/24

 

Hope to help

Giuseppe

 

Beginner

Re: Inconsistent address and mask

Let’s see if I understand... when i use ip route as destination I must enter the network address which is 40.0.0.0 and not the ip address of the server which is 40.0.0.2 right? I was confused because when we assign ip addresses we cant give the number 40.0.0.0 as an first ip we must give it 1 Like 40.0.0.1

Beginner

Re: Inconsistent address and mask

yep that right you must your network in routing, and one thing you must know about project like this, Connected network doesn't need any route.
when you set IP in your interfaces, Router add Routes Automatically in your Routing Table as a connected(you can see there as a 'c' symbol in show ip route command output), just you need set Default Gateway for your devices.
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