[manet] Re: MANET WG Charter and MANET Internetworking

Hello,

On Fri, Jul 18, 2025 at 12:12 AM Stevens, Jim
<[email protected]> wrote:
>
> Some of the recent emails presume that MANET radios are IP routers and radios *only* route using IP, so that questions arise with whether you decrement TTL for each radio hop.  Similar questions arise with overlay/underlay networks and MANET wireless networking getting partitioned.  And, also multihop MANET networks that get partitioned lead to the issues raised in RFC 4903 about Multi-Link Subnet Issues.

MANET normally use only host routes (or routes to prefixes that are
reachable through a single router), so the subnet split is not that
important for them. It is also a good idea to NOT put a subnet on your
MANET interface but put a /32 address on it (or just a linklocal one).

> So the MANET IETF working group also needs to consider MANET wireless networks where the wireless MANET routing is below IP – similar to how Ethernet switches route below IP.   This eliminates the TTL issues.  And overlay/underlay networks (whether MANET radios route using IP or below IP) can allow MANET radios in one IP subnet to transmit to another radio in that MANET wireless network that is in a different IP subnet.  And overlay/underlay can be adapted to solve Multi-Link Subnet issues as well

MANET can work with layer-2 forwarding below, but using two MANET
layers independently on top of each other can lead to all kinds of bad
side effects.
MANET protocols can also be working on layer-2 itself if you can
change the used address type to MAC addresses (and ignore the parts
being able to use a prefix).

Henning Rogge

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