Margaret Wasserman <margaret...@gmail.com> wrote:
> Let me see if I can start a technical discussion here...
> If you have an ISP today that has two different access networks
> available, such as one 3GPP network and one DSL network, how do(es) the
> gateway box(es) (connected to both networks) decide where it should
> send each packet it receives? I think there are several possible cases
> here;
These scenarios are all in the homenet architecture document, btw.
Can you tell me if this is IPv4+NAPT or IPv6? (The IPv4 case without NAPT is
mostly the same as IPv6)
> (1.2) Hosts behind the gateway have only one address each. This has
> two sub-cases:
> (1.2.1) The gateway has separate addresses on the two networks, and
> does some sort of translation from internal to external addresses in
> the prefix of the "right" outgoing link.
NAPT.
> (1.2.2) The gateway has only one IP address that is somehow shared
> across the two links.
MPPE or equivalent.
Can you tell me if in your scenarios, the operator of the two access networks
is the same?
> (2) There are two gateways, each attached to a single outbound network.
> In this case, hosts will always have separate addresses for the two
> networks, and will need to make a decision about which outbound network
> to use.
As you say, this is a kind of MIF with multi-provisioning domains, and
if the host can decide the right choice of source address, the rest is
"solved" by homenet already.
> Cases 1.1 and 2 are essentially the same from a host standpoint, in
> that the host needs to make a network choice. This is a problem we
> have discussed in MIF -- What sort of information does/should the host
> need to make that choice, and how is that information communicated to
> the host?
Yes, I agree.
> Case 1.2.1 is a typical case of how NAT (or NPTv6) can be used for
> multi-homing. The IETF generally prefers to avoid recommending
> solutions that use NAT, but do we have a better answer?
> Case 1.2.2 becomes a layer 2 problem and is probably outside the scope
> of the IETF.
> Are there cases that I am missing here?
I am trying to think whether embedding a second layer of the problem in the
scenario changes anything significantly.
--
] Never tell me the odds! | ipv6 mesh networks [
] Michael Richardson, Sandelman Software Works | network architect [
] m...@sandelman.ca http://www.sandelman.ca/ | ruby on rails [
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