[HECnet] SIMH + Multiple interfaces + DECnet

[Cory Smelosky]

On 31 Dec 2012, at 15:44, <Paul_Koning at Dell.com> wrote:


On Dec 29, 2012, at 2:33 PM, Cory Smelosky wrote:


On 29 Dec 2012, at 14:29, <Paul_Koning at Dell.com> wrote:
...
This changes with Phase V, since that doesn't change the MAC address (if it doesn't have to be Phase IV compatible, that is).   Also, unlike Phase IV, Phase V supports end nodes with more than one interface.

Can you have different addresses per interface in Phase V?

No, that's an IP mistake DECnet did not adopt.   Addresses are node addresses, not interface addresses.   The reason Phase V handles multiple interfaces (whether on the same LAN or not) is that it doesn't set the MAC address, as Phase IV does.   Instead, the nodes keep a table of node address to MAC address mappings -- analogous to the ARP table in IP, but derived from (a) hello messages and (b) incoming traffic rather than from broadcasts.

Aaaaah.   I understand now. Thanks.


	paul


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Cory Smelosky
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