[Info-vax] Change MAC on network card

[Stephen Hoffman]

On 2023-04-03 14:44:43 +0000, El SysMan said:

>  Is there a way to change MAC on network card ?

Terse questions beget terse answers. Variously terse answers to 
questions not intended, too.

On some NICs, swap the ROM. Old DEC NICs often had a swappable socketed 
MAC ROM DIP.

On others, scrounge the vendor configuration tool.

For OpenVMS changing the NIC MAC for, say, DECnet, send a $QIO or 
$IO_PERFORM at the controller to set the new MAC, per the I/O Abuser's 
Reference Manual.

On some Integrity, remap the MACs in the virtual I/O configuration 
system, where that was installed.

On some Alpha, set the MAC in the SRM console.

For other systems, see the systems' particular documentation.

Most (All?) NICs support multiple MAC addresses (phys/hardware MAC, 
multicast, broadcast), the question is how many can be loaded, and what 
happens to NIC performance when the NIC exceeds its internal MAC limits 
and falls back to promiscious mode processing.

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