Answer Inline
> 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, The router will make a decision on which interface to use based on the
destination IP address of the Packet it is routing. Either by a connected
network or the next hop according to the routing table. If it's a trunk
interface with subinterfaces, same thing applies except the router will
encapulate the packet in the proper frame (ISL or Dot1Q)
> 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?
The router doesn't disable hosts. If you assign a ip address to an
interface on a router and a host already has it, the router will tell you
with a consol message. It will ARP for the address it you assigned it to
see if there is a duplicate.
Same thing with hosts. Depending on the OS, If you assign an address that
is already in use on the network, you will get an error message like a " pop
up" in winblows. Host ususal do an ARP for it's address just like a router.
Appletalk works in the same way, sort of. It actual can randomly pick it's
own host address in the cable range and checks to see if its in use, If it
is, it try's another one.
Hope this helps.
Tony M.
#6172
> Thanks
>
> Hamid
>
>
> [demime removed a uuencoded section named 50a.jpg which was 1310 lines]
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