You don’t use wireless?
boy are you behind the times.
Make sure you have latest firmware.
http://www.cisco.com/en/US/docs/routers/csbr/rvs4000/release/notes/rvs4000_rn_v2_0_3_2.pdf
Holy carp! I just found a brand-new, unopened Cisco RVS4000 Router in the “basement computer museum”, which I’d bought ($109) in March thru Amazon, and never installed/configured. It’s got all the new pieces: coax, ethernet, power, CD, Quik-Start Manual etc:
http://www.cisco.com/en/US/prod/collateral/routers/ps9923/ps9928/data_sheet_c78-496735.html
Working on that setup/install/configure now...