Subject: [manet] Routing to and from the Internet

From: "Manfredi, Albert E" <[email-masked]>
Date: Fri, 28 Jun 2002 15:04:00 -0400

Hoping not to bore anyone with this recurring topic ...

If MANET used something like RFC 1256, ICMP Router Discovery Messages, then in principle a MANET host wanting to access the Internet could keep a log of available gateways to include in its source routing list. These messages would have to be transmitted at some approriately high rate by the MANET-Internet gateways, in accordance with the mobility characteristics of that MANET (and not necessarily in accordance with RFC 1256), so each host will have a high probability of reaching the selected gateway at the right time.

The problem remains, for me, how the packet from this MANET host, having reached its intended Internet destination, can find its way back from the Internet to the MANET host.

If each MANET host is provided with an IP address applicable to that MANET, by some DHCP-like process, that would work. But if a MANET host is expected to be able to use its own IP address, as many think should be the case, then somehow the gateway would have to prepend its own IP address prefix to the MANET host's IP SA?

One hopes that when the response from the Internet arrives, that MANET-Internet gateway can still reach the original MANET host. The again, that would be true regardless.

Thanks.

Bert

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