Charlie,
On 1/23/2015 1:17 PM, Charlie Perkins wrote:
Hello Joe,
..
Regarding other things to consider before assuming this is a new problem:
L2VPN
We are definitely not dealing with VPNs.
DTN (which is more than about delay)
if your delays/disruptions are brief enough,
that's covered by existing dynamic routing
Well, the dynamic routing protocols haven't been suitable
for ad hoc networks for various reasons. That discussion
could fill volumes. Much of the reason is because they do
not easily handle the problems outlined in the draft. That's
a terribly long discussion.
Yes - it can, and does, fill books, and it's not a useful point to try
to summarize in an RFC.
Well, in [manet] we are dealing with routers to establish multihop
connectivity between endpoints.
That's an L2VPN.
At the L2VPN layer, you're using L3 to transit L2 between disconnected
islands of reachability. L2 frames between those islands are carried
inside L3 packets that go over L2.
When you run IP over that, IP thinks it's a single L2 subnet.
We don't propose that an ad hoc network is a single L2 subnet,
and I'm pretty darned sure that L2VPN would not work for them.
Similarly for other networks as mentioned. Have you looked at
ad hoc networks? Please do, and see if you think L2VPN would work.
I'm struggling to find out what you want to do other than make us all
understand that what you want to do is really hard, that it makes IP
hard, and that you haven't explained it yet.
Let's focus on the hidden receiver problem. So? It's reachable from some
nodes but not others. If it's truly hidden to the point where it's only
a sink, then that's what it is (and we've already discussed why this
isn't the primary concern here).
If not, then other nodes can relay traffic to it. Yes, that's hard. Yes,
that requires complicated routing. And yes, that's entirely a problem
within a single L2 *IF* it can be solved there.
If it cannot, but that sort of bidirectional reachability can be solved
using a L3 relay, then that's an L2VPN.
Is there a third case here? The only one left is a network that you
can't fix inside L2 and can't be fixed with L3 relay. That's just
"disconnected" and there's no need to fix it.
If you have a problem that isn't described above, it is you who need to
describe it. The burden of proof is on you to explain what's new. The
rest of us (broadly speaking) already know what's not.
Joe
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