Suppose you have these lines as part of a router's configuration:
no ip routing
no ip cef
ip address 192.168.0.1 255.255.255.0
no ip route-cache
ip address 192.168.1.1 255.255.255.0
no ip route-cache
ip default-gateway 10.0.0.1
When I have pinged 172.16.0.1 I have seen an ARP request with target address 10.0.0.1 sent out both the interfaces.
I have done this strange test because it was not clear which interface the router would have chosen in order to forward the packet.
Then I have thought that with the configuration ip default-gateway 192.168.0.2 the router would have chosen only interface fa0/0 in order to forward the packet. But instead the router have sent an ARP request with target address 192.168.0.2 out both the interfaces again.
This could make sense because without routing enabled all the interfaces are equivalent. So, is it correct to say that, without routing enabled, the router is like a "primitive" host with multiple interfaces? I have used the term "primitive" because normally a "non primitive" host does a minimal routing work instead.
When IP routing is disabled, the router will act as an IP end host for IP packets destined for or sourced by it, whether or not bridging is enabled for those IP packets not destined for the device. To re-enable IP routing, use the ip routing command.
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