Did not work as expected

[Simon Hobson]

Leandro <ingrogger at gmail.com> wrote:

> shared-network Public {

> What is wrong ?

What you have drawn is ***NOT*** a shared network.
It seems you did not digest that from the previous discussion regarding your network architecture.

To recap, a shared network is where there are two (or more) subnets ON THE SAME BIT OF WIRE (or more technically, on the same broadcast domain).

So, looking at your diagram, in Cisco speak you have something like :
interface Fastethernet0/1
  ip address 192.168.88.1 255.255.255.128

interface Fastethernet0/2
  ip address 192.168.88.129 255.255.255.128


Or in Linux speak :
ip addr add 192.168.88.1/25 dev eth1
ip addr add 192.168.88.129/25 dev eth2

Two separate networks, separate broadcast domains, separate IP subnets.


For it to be a shared network, both subnets would need to be defined on the **SAME** interface of your router :

interface Fastethernet0/1
  ip address 192.168.88.1 255.255.255.128
  ip address 192.168.88.129 255.255.255.128 secondary


Or  :
ip addr add 192.168.88.1/25 dev eth1
ip addr add 192.168.88.129/25 dev eth1  <- note same device



I'll reiterate, you REALLY REALLY must get these very basic IP networking concepts sorted - if you don't then you WILL struggle to build a working and reliable network.
Once you have the network and IP topology sorted, then you must accurately describe that to the DHCP server - that means NOT declaring a shared network where you do not have one.