I have used MikroTik RouterOS and I found a telnet-over-Ethernet (a layer 2 telnet), MAC telnet on it.
I think it's a great tool, when SSH dies, or someone misconfigures IP Addresses. So the thing about it that you could telnet to a MAC address, log in, etc.
RouterOS is based on Linux, but are there Layer 2 telnet solutions - open-source projects (or in the repositories) under e.g.: Ubuntu, Fedora?
http://lunatic.no/2010/10/routeros-mac-telnet-application-for-linux-users/
I'm on Debian at the moment, and I see both a client (package mactelnet-client) and server (predictably, mactelnet-server). In the case of the client, mactelnet is the binary to run. I'd be very wary of the security aspect in a piece of software like this, though. Linux TCP/IP has a well-established, peer-reviewed, often audited stack and toolset.
However, as other(s) have mentioned already, if you need a remote-access console for your computer, invest in a machine with IPMI 2.0 or similar management subsystem, or buy an RS-232-to-ethernet adaptor and configure a serial getty on your computer. The former allows you access to the computer's BIOS/NVRAM, the latter doesn't unless your computer has ‘Serial Redirection’ support (Dell servers do, for one).
It's interesting that on non-PC servers (e.g. SPARC machines), this sort of thing is the norm. Our Sun T100-based boxes don't even have keyboard or display ports. All management is done via a serial or ethernet console. Older Suns automatically use the first serial port as the console unless a keyboard is plugged in on boot.
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