Multiple ethernet addresses vs. IP addresses

Hi,
Using Workgroup Manager on SLS 10.6.4, I have successfully mapped hosts and their MAC addresses to fixed IP addresses within our LAN. All is well, until someone works on the back of one of the Mac Pros and ends up plugging the ethernet cable into jack #2 instead of #1. Now the MAC address is unintentionally different.
I suppose I could make a secondary set of hostnames for ethernet2, but that seems ugly and if you're depending on host foobar being available for a particular printer, but it's now foobar2, that seems unpredictable.
How do you deal with this? I assume this is in the same realm as having a laptop that connects via wireless one day but via an ethernet cable the next day? It's the same host, just not the same MAC address. Does WGM have a way to deal with multiple ethernet addresses?
Thanks,
-- Antoine

ahh, i see.
you're running up against a few limitations here.
bootpd uses MACs to define static mappings.
OD uses MACs to identify nodes/clients.
your client machines have multiple MACs and may present one or the other on the network, depending on whether someone plugs in the wrong port.
here are some options/workarounds off the top of my head:
1. disable the second interface. if you need it for some reason, you'll have to deal with this situation another way.
2. bond the two interfaces. the downside is that you'll need to have both plugged in for optimal results, but you'll have one MAC, i believe.
3. use another dhcp server configured to deny all dhcp requests except those from your approved MACs (en1, let's say).
4. use local MCX and not deal with changing MACs at all. this is a little more difficult to manage, however.
5. manage prefs in some other way, like with puppet or casper, that don't strictly depend on MACs.
i'm sure there are other ways to deal with this situation, but if you're managing these systems, i'd probably just disable the second interfaces. people will learn quickly when they can't access the network. determine if this is more of a technological or a policy/personnel management issue.

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Multiple ethernet addresses vs. IP addresses

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