I have a reason to explore a single nic route. That is multi-homing, external and internal interface on the same ethernet interface.
Assuming this can be done, I haven't even tested the concept yet, Are there glaring security reasons not to do this?
It can be done, but yes, there are glaring security reasons to avoid such a practice.
The primary issue is with both internal and external networks on the same physical wire, it is trivial in the extreme to simply bypass the router. This makes the router either redundant (no need for it in the first place, since everyone on the same wire can already talk amongst themselves), or allows violation of any firewall rules you're trying to implement on the router.
The only instance I can think of in which a single physical interface router would make sense to me is if you're using VLANs, in which case you could build a router to bridge different VLAN segments on a single physical link. Of course, I suspect if you're buying VLAN capable switches, you probably wouldn't have posted the above question in the first place.
There are some other instances where this sort of topology might be useful, but in general you're better off to simply renumber your networks.
Provide a bit more detail about what you're trying to accomplish, and the constraints you're working with (ie no money to buy two hubs, trying to connect multiple existing networks that can't be renumberd to a single physical segment, or whatever), and we can probably provide decent advice.
-- Charles Steinkuehler [EMAIL PROTECTED]
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