At 03:55 AM 8/18/01, Hamid wrote:
>Hi
>
>I was studying the InterVlan routing documents and I got to some questions.
>In a scenario like the attached file:
>
>1. How does the external Router decide how to route the packets between the
>VLANs, is the INTERVLAN routing based on the IP address assigned to
>sub-inteface?
Yes, that's right.
>2. In these scenarios, how does the router detect a conflicting IP address?
>For example, if each IP subnet is assigned to a VLAN( 10.10.1.0 to VLAN 1
>and 10.10.2.0 to VLAN 2), if two computers on both VLANs are assigned the
>same IP address (for example 10.10.1.5), how is the confilit detected and
>which computer is disabled?
A router has never been able to detect duplicate IP addresses. It's not its
job. When the first packet comes in to the router from one of the devices
assigned to 10.10.1.5, the router would add the source addresses to its ARP
cache (assuming it's doing ARP gleaning) or the first time it sent to the
IP address it would ARP and get the MAC address from the first response.
If you use DHCP you shouldn't get duplicates anyway. DHCP checks for
duplicates.
Priscilla
>Thanks
>
>Hamid
>
>
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________________________
Priscilla Oppenheimer
http://www.priscilla.com
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