Complete swap. The old Netgear router was completely burned out as a wireless device; some Googling showed this was a common problem with the model. The wifi just ... dies. Still a lovely 4-port switch, but useless to me as a household networking device.
Nope, no problems with the Netgear. The file-transfer blues started with the Linksys (which is, as noted, tarted up in dd-wrt drag).
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And I am intrigued by the double-barreled recommendation of powerline networking. Models/makes you guys particularly like/have experience with?
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