I think the NM-1E will fit/work on the 2612. This is a 10Mb ethernet network module. I don't think there are any fast-ethernet modules available for the
2612. Reason for this is that I think the 2612 won't be able to handle much more than a throughput of 10Mbps.
Right, there is no Ethernet WIC that will work in the 2600. The WIC-1ENET is for 17xx only. There's some new HWIC ethernet modules only for the 1800/2800/3800 models.
Well, you don't have a FastE now, just a single 10. There's two solutions. The NM-1E to get you one 10-Base-T port. Or the NM-16ESW to get you a 10/100 port with a 16-port Switch attached.
If you don't need the token ring port on your router now, it may be easier/quicker/cheaper to just buy a new 2801/2811 that will come with dual FastE's if that is what you want.
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