On 08/26/2011 13:57, Adam Novak wrote:
> On Fri, Aug 26, 2011 at 3:49 PM, Doug Barton <do...@dougbarton.us> wrote:
>>
>> I have a related-but-different example of how end nodes being able to
>> know/discover direct paths to one another could be useful. Imagine a
>> busy server network with some web servers over here, some sql servers
>> over there, etc. All of these systems are on the same network, same
>> switch fabric, and have the same gateway address. In an ideal world I
>> would like them to be able to know that they can speak directly to one
>> another without having to go through the gateway (and without my having
>> to manually inject static routes on the hosts, which of course is both
>> painful and un-scale'y.
>
> Shouldn't that be covered by the subnet mask?
Mostly, yes of course, but I'm dramatically simplifying my example for
dramatic effect. :)
> As long as they know
> they're on the same subnet (and ARP broadcasts will reach everyone)
> they should just ARP for each other and not involve the router at all.
>
> If they are on different IP subnets, but the same Ethernet,
Yes, this is more often the case that I'm dealing with. (Working on
fixing a problem I inherited for a new client, so per your comment below
"don't number that way" may be the right answer.)
Doug
> then we
> can either come up with a new way to do routing, or tell people not to
> number things that way. Perhaps a subnet mask or CIDR prefix is not
> expressive enough?
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