[HECnet] DECnet et al

[Johnny Billquist]

On 2011-07-17 19.55, hvlems at zonnet.nl wrote:
If there is no router present (on ethernet) then an endnode will just try and send the datagram. It knows the destination decnet address and thus can compute the target mac address.

Right. Thinking a little more I realize that it will do this.
This would not be very useful in HECnet, since we have several areas, and not everything is connected to the bridge. So routers are definitely needed, and thus you need atleast one L2 router in your area in order to talk to machines in other areas which you do not have a direct connection to. Or else you'll isolate yourself to only talk to directly connected machines.

	Johnny

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Van: Johnny Billquist
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Onderwerp: Re: [HECnet] DECnet et al
Verzonden: 17 juli 2011 19:49

On 2011-07-17 19.45, Bob Armstrong wrote:
And so those packets will be tossed.

      Tossed by who?   The bridge program?

No. By the endnode itself. It have no idea where to send it. For
ethernet, DECnet supposedly already knows the MAC address where to send
every packet. Where would it send a packet that isn't to the local
ethernet segment? It needs to send it to a router, which will forward
it. But since there is no router, there is nothing it can do with it.
DECnet data traffic is not broadcast...

Just as information - from MIM, the area furthest away is are 59, which
is three hops distance. So it packets needs to pass through two
intermediate level 2 routers to get to the right area.

	Johnny

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